Yishun Primary 4 Science tuition should help students compare two objects or setups on the same scientific axis. Many weak answers mention one fact about A and a different kind of fact about B, so the sentence sounds comparative without actually comparing.
This rebuilt legacy URL now owns one distinct P4 Science job: shared property → A value/state → B value/state → direction of difference → evidence. Old result promises, mixed-grade copy and implied Yishun-centre wording have been removed.
eduKateSG does not claim a current Yishun branch. Current centres are at 83 Punggol Central, Singapore 828761 and 8 Fourth Avenue, Singapore 268674. Selected Primary Science classes run in focused 3-pax small groups, typically 1.5 hours.
The Direct Answer
A valid comparison uses one shared criterion.
Weak:
“Plant A is taller, while Plant B has darker leaves.”
These are two facts, not one comparison.
Stronger:
“Plant A is 4 cm taller than Plant B after seven days.”
Compare like with like: height with height, temperature with temperature, time with time, function with function.
Worked Example: Temperature
Setup A: 55°C after ten minutes.
Setup B: 48°C after ten minutes.
Comparison:
“After ten minutes, the water in Setup A was 7°C warmer than the water in Setup B.”
Both setups are compared on temperature at the same time point.
Worked Example: Plant Growth
Plant A grew 6 cm. Plant B grew 2 cm.
“Plant A grew 4 cm more than Plant B over the same period.”
Do not compare Plant A’s final height with Plant B’s growth amount.
Worked Example: Material Absorbency
Material A absorbed 20 mL. Material B absorbed 12 mL.
“Material A absorbed 8 mL more water than Material B under the same test.”
Worked Example: Life Cycles
Comparison axis: resemblance of young to adult.
“A chick resembles an adult chicken more closely than a caterpillar resembles an adult butterfly.”
Do not switch halfway to number of stages.
Worked Example: Systems
Compare the job of two parts:
“Roots absorb water and mineral salts, whereas the stem transports them to other parts of the plant.”
The shared axis is function within the transport system.
The Shared-Axis Test
Finish:
“I am comparing A and B in terms of ___.”
If the blank cannot be filled with one property or relationship, the sentence may not be a real comparison.
The Same-Time Test
Do not compare Setup A at five minutes with Setup B at ten minutes unless the question specifically asks for that.
Time point must be aligned when time affects the outcome.
The Same-Quantity Test
Do not compare “Plant A is 15 cm tall” with “Plant B grew 5 cm”. One is final height; the other is change in height.
Convert both to the same quantity before comparing.
The Direction Test
Use clear comparative language:
- greater/lower;
- warmer/cooler;
- longer/shorter;
- more/less;
- faster/slower;
- same/different.
Where data allows, state the size of the difference too.
Worked Example: Graph
At 30°C, Setup A took 40 seconds and Setup B took 55 seconds.
“At 30°C, Setup A completed the process 15 seconds faster than Setup B.”
The condition and measure are both aligned.
Comparison vs Explanation
Comparison:
“A cooled more slowly than B.”
Explanation:
“A cooled more slowly because its wrapping reduced heat transfer more effectively.”
Do not give explanation when the question only asks to compare, and do not stop at comparison when explanation is required.
Comparison vs Description
Description: “A’s temperature decreased from 60°C to 50°C.”
Comparison: “A’s temperature decreased by less than B’s over the same period.”
The first describes one setup; the second relates two.
Qualitative Comparisons
Not every comparison needs numbers:
“Material A is transparent, whereas Material B is opaque.”
The shared axis is light transmission.
Quantitative Comparisons
When numbers are supplied, use them:
“A supported 50 g more than B before breaking.”
This is more precise than “A was stronger”.
The Comparison Table
| Axis | Setup A | Setup B | Comparison |
|---|---|---|---|
| Temperature | 55°C | 48°C | A is 7°C warmer |
| Growth | 6 cm | 2 cm | A grew 4 cm more |
Why Same-Axis Comparison Matters for Fair Tests
A fair setup can still produce a weak answer if the student compares different outcomes. Good experimental design and good comparison language must work together.
P4 Curriculum Context
MOE’s Primary Science syllabus develops comparison and communication as scientific practices across P4 topics such as Matter, Light, Heat and Systems. Official reference: MOE Primary Science Syllabus.
Common Same-Axis Failure Modes
| Symptom | Issue | Repair |
|---|---|---|
| A height vs B leaf colour | Different axes | Choose one property |
| Final value vs amount changed | Different quantities | Convert to same measure |
| Different time points | Conditions misaligned | Compare same time |
| Numbers ignored | Precision lost | State magnitude |
| Explanation given instead of comparison | Task mismatch | Answer compare first |
Why Three Students Helps
One student chooses the comparison axis, one writes the A/B statement and the third checks whether the quantities and time points actually match.
When Yishun Primary 4 Families May Consider This Support
- “Compare” questions receive two unrelated facts.
- Final values and changes are mixed.
- Numbers are present but ignored.
- Students explain causes before stating the actual difference.
What Progress Should Look Like
A stronger P4 learner can name the shared axis, align the conditions and state both the direction and, where possible, magnitude of the difference.
Independent location notice: eduKateSG does not claim a current Yishun branch. Current centres: 83 Punggol Central, Singapore 828761 and 8 Fourth Avenue, Singapore 268674. Contact +65 8823 1234.