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Top 200 Vocabulary for Primary 1 Mathematics | MOE P1 Maths Words, Word Problems and Number Sense

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by

eduKate Asia
Three primary students in matching blue pinafores work together over open books at a classroom table, with colourful stationery and lesson notes on a whiteboard.

Quick answer: Primary 1 Mathematics vocabulary is the language children need to count, compare, understand tens and ones, add, subtract, share equally, read clocks, recognise flat shapes and answer picture-graph questions. This guide gives 200 words and short expressions, each explained simply, with a practical route from hearing a question to working it out.

In Singapore’s MOE Primary Mathematics syllabus, updated October 2025, Primary 1 includes numbers up to 100, addition and subtraction, introductory multiplication and division, money, length in centimetres, time to five-minute intervals, 2D shapes and picture graphs. The 200 entries here include syllabus terms and helpful everyday question words; they are not an official MOE memorisation list. Parents should teach a small set through objects, spoken sentences and drawings, rather than drill all 200 at once.

Jump to what you need:

The top 200 Primary 1 Maths vocabulary words and phrases

Read each entry aloud, show it with an object or picture, and ask the child to use it in a short sentence. Some entries are phrases because the language of a question, not just a single noun, often determines the calculation.

1. Counting and recognising quantities (words 1–20)

  1. number — A way to tell how many things there are or which value is meant.
  2. digit — One written symbol from 0 through 9; digits combine to form numbers.
  3. numeral — The written form of a number, such as 12.
  4. number word — A number written in letters, such as twelve.
  5. quantity — How many objects or how much of something we are describing.
  6. count — Say one number for each object, without skipping or repeating any.
  7. count on — Begin from a known number and move forwards.
  8. count back — Begin from a known number and move backwards.
  9. one-to-one matching — Pair each counted item with exactly one counting word.
  10. object — One thing that can be counted, moved or described.
  11. item — A single article in a larger collection.
  12. collection — Several things gathered together to count or sort.
  13. set — A group of objects treated together for a mathematics question.
  14. tally — A mark used to record one counted item.
  15. zero — No objects in a set; written 0.
  16. one — A single object or one unit.
  17. two — A pair of individual objects.
  18. three — A count of three individual objects.
  19. four — A count of four individual objects.
  20. five — A count of five individual objects.

2. Comparing and arranging numbers (words 21–40)

  1. same number — Two collections have equal counts, even when arranged differently.
  2. different number — Two collections do not contain equal counts.
  3. more than — A greater number of objects or a larger value.
  4. fewer than — A smaller count of objects.
  5. less than — A smaller numerical value; compare numbers, not physical size.
  6. greater than — A larger numerical value.
  7. equal to — Two amounts have the same value.
  8. not equal to — The two compared values are different.
  9. compare — Look for how two numbers or collections are alike or different.
  10. arrange — Put numbers or objects in a requested order.
  11. order — A sequence formed according to a rule, such as smallest first.
  12. smallest — The lowest value in a given group.
  13. largest — The highest value in a given group.
  14. biggest amount — The greatest quantity, not necessarily the largest-looking picture.
  15. least — The smallest amount or value in the comparison.
  16. most — The greatest count or quantity in the comparison.
  17. ascending — Arranged from lower value to higher value.
  18. descending — Arranged from higher value to lower value.
  19. between — Located after one endpoint and before another in a sequence.
  20. neighbouring numbers — The whole numbers immediately before and after a chosen number.

3. Place value and number structure (words 41–60)

  1. ones — Single units occupying the rightmost whole-number place.
  2. tens — Bundles of ten ones, used to organise larger numbers.
  3. place value — The value a digit has because of its position.
  4. two-digit number — A whole number written using two digits, such as 47.
  5. single-digit number — A whole number written with one digit, such as 8.
  6. bundle of ten — Ten single objects grouped as one ten.
  7. loose ones — Individual objects not grouped into tens.
  8. ten-frame — A frame of ten spaces for seeing numbers and making ten.
  9. number bond — A diagram connecting a whole quantity with its parts.
  10. whole — The complete amount represented in a part–whole relationship.
  11. part — One portion of a whole amount.
  12. split — Separate a number or collection into smaller parts.
  13. partition — Show one number as two or more smaller quantities.
  14. combine parts — Bring smaller quantities together to make a whole.
  15. make ten — Pair parts whose total is ten.
  16. recompose — Put separated parts back together without changing the value.
  17. representation — A picture, model, numeral or object arrangement showing a number.
  18. number line — A straight line on which numbers follow an ordered scale.
  19. number chart — A displayed arrangement of numbers used to spot number patterns.
  20. missing number — A value left blank for the learner to work out.

4. Addition language (words 61–80)

  1. addition — Joining quantities to find the combined amount.
  2. add — Put a quantity together with another quantity.
  3. plus sign — The symbol +, which indicates addition.
  4. sum — The result of adding numbers.
  5. addend — One number being added to another.
  6. altogether — A clue that separate parts may need to be combined.
  7. in total — The amount after all relevant parts are counted.
  8. more added — An increase caused by adding another quantity.
  9. increase — Become larger in number or amount.
  10. gain — Receive extra items or value.
  11. join — Bring two groups together while keeping track of all items.
  12. put together — Combine separate quantities into one collection.
  13. double — Make two equal copies of a number, such as 6 + 6.
  14. near double — Use a familiar double to solve a nearby sum.
  15. count forwards — Move to larger numbers while finding an addition answer.
  16. add zero — Keep the original value because zero contributes nothing.
  17. add one — Find the next whole number.
  18. addition sentence — A mathematical statement that shows numbers being added.
  19. add in stages — Add several numbers one step at a time.
  20. check an addition — Use counting or another arrangement to confirm the answer.

5. Subtraction language (words 81–100)

  1. subtraction — Finding what remains or the difference between amounts.
  2. subtract — Take one amount away from another.
  3. minus sign — The symbol −, showing subtraction.
  4. difference — How far apart two values are numerically.
  5. take away — Remove some objects from the starting collection.
  6. left — The number still present after some are removed.
  7. remain — Continue to be present after a change.
  8. fewer left — A smaller remaining amount after objects are taken away.
  9. decrease — Become smaller in amount or number.
  10. lose — Have objects or value taken away.
  11. remove — Take selected objects out of a set.
  12. cross out — Mark counted-away objects so they are not counted again.
  13. count backwards — Step to lower numbers while subtracting.
  14. count up to find the gap — Start at the smaller number and count to the larger.
  15. start amount — The quantity before something changes.
  16. amount taken — How many items are removed.
  17. balance after taking — What is still available once removal is complete.
  18. subtraction sentence — A statement showing an amount being subtracted.
  19. undo addition — Use subtraction to reverse a known addition fact.
  20. check a subtraction — Add the difference to the smaller number as a check.

6. Groups, multiplication and sharing (words 101–120)

  1. equal groups — Collections that each contain the same number of items.
  2. group size — The number of items in one equal group.
  3. number of groups — How many equal collections are formed.
  4. repeated addition — Adding the same quantity several times.
  5. multiplication — Combining equal groups efficiently.
  6. multiply — Find the total in equal-sized groups.
  7. times sign — The symbol × used in a multiplication statement.
  8. times — How many equal copies of a number are taken.
  9. twice — Two times as many as the stated amount.
  10. three times — Three equal copies of the stated quantity.
  11. array — Objects arranged in equal rows and columns.
  12. row — A horizontal arrangement of objects.
  13. column — A vertical arrangement of objects.
  14. share equally — Give the same number of items to each receiver.
  15. division — Separating into equal groups or equal shares.
  16. divide — Share or group an amount according to a rule.
  17. equal share — One person’s portion when everyone receives the same count.
  18. each — Refers to every one of the groups or people described.
  19. per group — For one equal collection; identify the group size.
  20. groups of two — Equal groups containing exactly two objects each.

7. Money and shopping words (words 121–140)

  1. money — Coins or notes used to pay for things.
  2. dollar — A Singapore currency unit written with $.
  3. cent — One hundredth of a Singapore dollar.
  4. coin — A small piece of currency with a printed value.
  5. note — Paper or polymer currency with a printed value.
  6. price — The money asked for an item.
  7. cost — The money required to obtain something.
  8. pay — Give money in exchange for an item or service.
  9. buy — Get something by paying its price.
  10. sell — Give an item in exchange for money.
  11. shop — A place where items can be bought.
  12. wallet — Something used to hold money.
  13. amount of money — The total value of the coins or notes shown.
  14. twenty-cent coin — A coin with a value of twenty cents.
  15. fifty-cent coin — A coin with a value of fifty cents.
  16. one-dollar coin — A coin with a value of one dollar.
  17. five-dollar note — A note worth five Singapore dollars.
  18. ten-dollar note — A note worth ten Singapore dollars.
  19. count the coins — Find their total value, not merely how many coins appear.
  20. same value of money — Different coins or notes can represent equal total amounts.

8. Length and time (words 141–160)

  1. length — The distance from one end of an object to the other.
  2. centimetre — A metric unit used to measure short lengths.
  3. cm — The abbreviation for centimetre.
  4. ruler — A measuring tool with equally spaced markings.
  5. line segment — A straight piece of line with two endpoints.
  6. endpoint — Where a line segment begins or ends.
  7. longer — Having a greater measured length.
  8. shorter — Having a smaller measured length.
  9. equal length — Two segments have the same measured distance.
  10. measure — Find a quantity using an appropriate unit and tool.
  11. nearest centimetre — The whole centimetre closest to a measured length.
  12. clock — A display used to show time.
  13. hour hand — The shorter clock hand that helps show the hour.
  14. minute hand — The longer clock hand used to read minutes.
  15. o’clock — The exact hour when the minute hand points to twelve.
  16. half past — Thirty minutes after an hour.
  17. five-minute interval — A block of five minutes on a clock.
  18. morning — The earlier part of the day.
  19. afternoon — The part of the day following noon.
  20. duration — How long an event lasts, rather than when it starts.

9. Shapes and picture-making (words 161–180)

  1. two-dimensional — Flat, with length and width but no physical thickness in the diagram.
  2. flat shape — A figure drawn on a surface.
  3. triangle — A closed shape with three straight sides.
  4. square — A four-sided shape with four equal sides and right angles.
  5. rectangle — A four-sided shape with four right angles.
  6. circle — A round plane figure whose boundary points are equally distant from its centre.
  7. half circle — One of two equal halves of a circle.
  8. quarter circle — One of four equal quarters of a circle.
  9. side — A straight boundary of a polygon.
  10. corner — Where two sides of a shape meet.
  11. straight line — A line that does not bend.
  12. curved line — A line that bends smoothly.
  13. edge of a shape — Part of its outer boundary.
  14. outline — The visible boundary around a figure.
  15. shape pattern — A repeated or rule-based arrangement of shapes.
  16. copy a shape — Draw a new figure matching the given one.
  17. combine shapes — Join smaller figures to create a larger picture.
  18. shape piece — One component used to form a combined figure.
  19. dot grid — A regular pattern of points used for drawing.
  20. square grid — An arrangement of equal squares used to locate or copy figures.

10. Picture graphs and problem-solving instructions (words 181–200)

  1. picture graph — A display using pictures to show quantities.
  2. graph title — Words explaining what the display is about.
  3. picture symbol — One image used to represent an item in a graph.
  4. category — A named group of items represented in data.
  5. label — Words identifying an item or group.
  6. record — Write down an observed number or result.
  7. survey — Ask questions to collect information.
  8. favourite — A preferred choice that might be recorded in a class survey.
  9. vote — One choice counted in a survey.
  10. data — Information collected for a question or graph.
  11. read the graph — Use the displayed information to answer a question.
  12. count the pictures — Find how many symbols appear for a category.
  13. highest count — The greatest number represented in a graph.
  14. lowest count — The smallest number represented in a graph.
  15. how many — A question asking for a number or quantity.
  16. how many more — A question asking for the difference between two counts.
  17. show your working — Write or draw the steps used to obtain an answer.
  18. draw a model — Use a picture or part–whole diagram to show relationships.
  19. explain — Tell why an answer or method makes sense.
  20. check your answer — Verify the calculation and match it to the question.

How mathematics vocabulary becomes problem solving

Children can recognise “plus” yet still be confused by “altogether”, “how many more”, “left”, or “each”. A strong start means translating everyday language into an observable relationship. Place four counters beside three counters. Ask, “How many altogether?” Then point to the joined set and write 4 + 3 = 7. The child should be able to say both the action and the number sentence: “I joined the two groups, so I added.”

Example 1: “Altogether” versus “left”

Question: Maya has 8 stickers. She gets 5 more. How many stickers does she have altogether? Reasoning: The amount increases; 8 + 5 = 13. Now change just one sentence: Maya gives away 5 stickers. How many are left? The amount decreases; 8 − 5 = 3. The verbs tell the child what happened. Do not teach “more” as a command to add in every sentence: in “How many more does Maya have than Kai?”, comparison requires finding a difference.

Example 2: “How many more” is a comparison

Question: Kai has 12 marbles and Aisha has 9. How many more marbles does Kai have? Draw 12 dots over 9 aligned dots. Nine pairs match; three remain unmatched. Therefore 12 − 9 = 3. The child should answer “Kai has 3 more marbles,” not merely write “3.” A comparison describes a gap, not an event in which someone loses items.

Example 3: Tens and ones prevent counting everything again

For 46, use four bundles of ten sticks and six loose sticks. Ask what changes when another ten is added. The answer is 56, because the tens change and the ones do not. Ask what changes if one stick is removed. The answer is 45, because the ones change. With every demonstration, let the child name the tens, the ones and the resulting quantity.

Example 4: Equal shares and equal groups are related but distinct

Give 12 buttons to three paper plates so each has the same number: four per plate. Then use the same 12 buttons to make groups of four: three plates are needed. The first version asks for the size of each group; the second asks for the number of groups. Children who can describe both situations are ready to see why multiplication and division are connected.

Example 5: The unit must travel with the answer

Measure a ribbon as 14 cm and another as 9 cm. The difference is 5 cm, not “5 ribbons.” Point to the ruler beginning at zero and ensure the child reads the correct endpoint. At this stage, a well-explained physical measurement is more useful than a difficult conversion exercise.

Example 6: Picture graphs require reading, not guessing

Imagine a fruit chart with 5 apple pictures and 3 pear pictures, one picture representing one vote. The apple category has 2 more votes. Ask, “Which category has the most?”, “How many votes were recorded altogether?”, and “How many more chose apples than pears?” Three questions use the same data but ask for three different mathematical relationships.

Six misunderstandings parents can diagnose in two minutes

  1. Counts objects twice: Ask the child to move each counter into a new row as it is counted. This makes the one-to-one match visible.
  2. Thinks a larger-looking cluster must contain more: Spread six counters widely and place seven close together. Compare their number, not the space occupied.
  3. Confuses tens with ones: Exchange ten loose sticks for one bundle, then exchange the bundle back. The total must stay unchanged.
  4. Adds whenever the question says “more”: Compare “gets 3 more” with “has 3 more than”. Ask whether the story describes a change or a comparison.
  5. Names a shape only by appearance: Rotate a square. It remains a square; orientation does not change its side lengths or right angles.
  6. Forgets units and the question’s person: Require a brief full-sentence answer such as “Aisha has 4 buttons on each plate.”

These repairs matter more than a quick correction. If the child gives the wrong answer, investigate the first moment where the representation changed. A student who can explain why a choice was made is building an ability that carries into later mathematics.

What is actually in Primary 1 MOE Mathematics?

Singapore’s current primary Mathematics syllabus uses three strands: Number and Algebra, Measurement and Geometry, and Statistics. For Primary 1, number work includes counting up to 100, place value in tens and ones, comparing and ordering, simple addition/subtraction and introductory multiplication/division. Measurement focuses on centimetres and telling time to five-minute intervals. Geometry includes common flat shapes. Statistics begins with picture graphs.

Important distinction: “P1 Mathematics vocabulary” here means language that supports those learning goals. It does not mean MOE expects pupils to sit an examination on 200 isolated definitions. Some words help children follow classroom directions and explain thinking; a parent may use them naturally before they become formal syllabus labels.

Why language matters as much as calculation

Take the equation 6 + 4 = 10. It can describe collecting six shells and finding four more. But it can also describe ten items divided into a part of six and an unknown part of four. When a pupil knows the meaning of whole, part, join and missing number, the same relationship becomes flexible. Without that language, the pupil may be left guessing from isolated trigger words.

This is the foundation of mathematical abstraction. A shell, a sticker and a counter are different objects, yet the relationship 6 + 4 = 10 remains the same. We want children to learn the transferable relationship, not just remember a worksheet picture. A child who says “The story changed, but the number bond stayed the same” is already thinking beyond a single example.

How to use the 200-word list without overloading a child

Choose five words that connect to one real activity. A shopping game might introduce price, pay, coin, same value of money and count the coins. Lay out toy coins, act out the dialogue and let the child explain what each word means in that scenario. Later, revisit the words using different prices or fewer coins.

Use three moves: show it with objects or a picture; say it in a complete sentence; use it in a new example. A child who knows a word only in one familiar worksheet has not yet fully transferred its meaning. One successful explanation during a new game is often a stronger signal than ten copied definitions.

A four-week vocabulary-to-thinking plan for home

Week 1 — See quantities and parts

Spend ten to fifteen calm minutes on counting, comparing, tens, ones, part and whole. Sort buttons or blocks into tens. Make two number bonds for the same number. Ask, “What stayed the same?” End with one child-created sentence rather than a long worksheet.

Week 2 — Translate addition and subtraction stories

Choose 8–12 high-use expressions, including altogether, remain, fewer than, how many more and difference. Read a tiny story, ask the child to describe the situation with counters, then write a number sentence. Change a single verb in the story and ask how the action changes.

Week 3 — Apply words to money, measurement and time

Run a toy-shop exchange using coins; measure objects in centimetres; ask the child to show “half past” and five-minute intervals on a clock. The goal is not speed but correct units and a meaningful link between words and actions.

Week 4 — Shapes, picture graphs and independent explanation

Build figures from cut-out shapes and count the class’s favourite fruit in a simple picture graph. Ask one question about the largest count, one about the total and one about the difference. Invite the child to design a question for the parent to answer.

When progress is uneven: return to the smallest missing relationship, then expand again. Sign up for Mathematics tuition only after the student’s starting position is clear. Whether help happens at home, in school or in a small group, use the child’s actual working to decide the next step.

For teachers and tutors: check vocabulary in context

“Define addition” and “show where two groups became one” measure different things. Ask students to point, draw, calculate and explain. If these representations disagree, diagnose the language or concept before increasing difficulty. A useful short assessment contains one familiar item, one slightly changed example and one question where the child must select the operation independently.

Frequently asked questions

Must a Primary 1 child memorise all 200 words?

No. This is a reference bank for understanding problems and classroom instructions. Begin with the most useful words in the child’s current lessons and revisit them in different situations.

Should my child learn Primary 2 Mathematics early?

Not until Primary 1 ideas are understood well. A child who cannot explain the difference between “altogether” and “how many more” benefits more from stronger foundations than from harder numbers.

What if my child can calculate but cannot understand word problems?

Read one sentence at a time and ask what changes, what stays fixed, which quantities are compared and what the question wants. Let the child draw or act out the story before choosing the operation.

Do Primary 1 pupils need to know algebra?

Formal secondary algebra is not the P1 syllabus focus. But finding a missing number in a number bond gently develops the same habit of reasoning about unknown quantities.

How do I tell whether the vocabulary is sticking?

Ask for a fresh example in the child’s own words a day or a week later. The strongest sign is correct use of the term in a new problem, not the ability to repeat one definition.

Next reading and primary sources

Read the eduKate Primary Mathematics 2026 syllabus guide, the Primary 1 instructions vocabulary companion and the mathematical question-language guide. For official learning outcomes, consult the MOE 2021 Primary Mathematics syllabus (October 2025 update). This independent guide is intended to make the syllabus easier to use at home.