Did you know that one little “N/A” can change an assignment percentage by twenty points? A rubric can make feedback fairer, but only when the teacher, learner and parent agree on what each criterion was meant to assess. Marking an inapplicable requirement as zero can suggest the pupil failed a task they were never asked to perform.
Not applicable (N/A) means a criterion is genuinely outside the approved assessment task, not that the pupil omitted required work. If the marking policy permits excluding it, the score is calculated from the eligible maximum marks rather than the full printed maximum. If a criterion was required but evidence is missing, do not silently rename it N/A: consult the stated rubric and assessment rules.
First, diagnose the type of blank space
Before calculating a percentage, put yourself in the assessor’s position. Was the criterion part of the assignment students received? Did the teacher explicitly remove it, change the format or offer a choice of task? Is the criterion impossible to observe in this format? These are different questions from “Was the pupil good at it?”
Consider four labels that are easy to confuse: earned marks for a criterion assessed; zero marks for assessed work that did not meet a required standard; N/A for an officially excluded criterion; and not yet assessed for evidence pending or unavailable. Only the third label potentially changes the eligible denominator under an approved exclusion rule.
A useful opening question for a learner is: “If I had done my very best work on this particular task, would the missing criterion have been relevant at all?” If the answer depends on the assignment format, find the teacher’s instructions before doing the arithmetic.
Worked example: a written report, not a live talk
Here is an illustrative scenario invented for teaching. A class receives a project rubric with four criteria, each worth a maximum of five marks: evidence, reasoning, presentation of charts and live speaking. For a separately approved written-only version, the teacher has stated in advance that live speaking is N/A and its five marks are excluded from the total.
- Evidence: 4 out of 5.
- Reasoning: 3 out of 5.
- Presentation of charts: 5 out of 5.
- Live speaking: N/A under the approved written-only task — not 0 out of 5.
The pupil earns 4 + 3 + 5 = 12 eligible marks. The applicable maximum is 5 + 5 + 5 = 15, giving 12 ÷ 15 × 100 = 80%. The arithmetic is hand-checkable: 12/15 simplifies to 4/5, and four fifths is 80%.
If someone instead divides by all twenty printed marks, the display says 12 ÷ 20 × 100 = 60%. That extra five-mark denominator treats an excluded speaking task as if the pupil was supposed to complete it. It changes the reported result without changing the quality of the submitted work.
Now change only the assessment instructions. Suppose live speaking actually was required, but the pupil gave no presentation and received zero. The eligible maximum would be 20, and the mark would indeed be 12/20 = 60%, assuming the rubric authorises zero for the missing work. The same written pages are involved, but the task requirements are different. The correct denominator follows the approved assessment, not what makes a percentage look better.
The deeper mechanism: a denominator is a claim about opportunity
When a school calculates “earned divided by possible”, the denominator says how many points were available to earn under the assignment. An N/A decision changes that opportunity set. It is therefore not an administrative decoration; it is part of the meaning of the final grade. Using a larger or smaller denominator without a policy basis can make outcomes less comparable, not more.
This matters especially when teachers adapt a task to a different approved format, use alternative evidence, or assess work at different stages. Every student’s score should be interpreted against the criteria that genuinely applied to that student under transparent, defensible rules. An N/A is not a reward, and it should not be assigned merely to protect a low mark.
What if rubric criteria have different weights?
Do not apply the simple 12/15 method to a weighted rubric unless its policy truly defines scores by adding raw marks. For a separate illustrative example, suppose content is 50% of the score, reasoning 30% and communication 20%. A pupil achieves 4/5, 4/5 and 5/5 respectively. The weighted result is (4/5 × 50%) + (4/5 × 30%) + (5/5 × 20%) = 40% + 24% + 20% = 84%. It is not found by ignoring the weights.
If a weighted criterion is officially removed, the assessor must follow the agreed reweighting rule. Some systems renormalise remaining weights; others prescribe a replacement task or do not permit exclusions at all. Reweighting without prior rules can unfairly change what the assessment values. For a formal school examination, follow the applicable school or examination authority policy; this article does not override it.
Common mistakes worth catching before marks are entered
- Missing equals N/A: a required oral presentation not submitted is not automatically an inapplicable criterion.
- N/A equals zero: this wrongly penalises a student if the criterion was officially outside the task.
- All criteria equal weight: a printed rubric may explicitly give different maxima or percentages.
- A percentage proves equal difficulty: two assignments can award the same percentage but assess different skills and standards.
- A silent change is harmless: changing the denominator after marking, without recording why, undermines auditability.
- A high score eliminates the need for feedback: 80% still contains teachable strengths and gaps.
Guided-to-independent practice
Guided: check the denominator aloud
A short project has three eligible criteria worth ten marks each. The pupil receives 8, 7 and 9; a fourth ten-mark criterion is explicitly excluded for every student in that project format. Compute 8 + 7 + 9 = 24 and 10 + 10 + 10 = 30. The reported result is 24/30 = 80%. Explain why adding a fourth ten to the denominator would not describe the assigned work.
Paired: find a misleading entry
One marker enters “N/A = 0” in a spreadsheet formula, while another excludes the N/A cell from both earned and available points. Ask what task instruction would make either method correct. The key is to identify the permitted treatment of the criterion, not to assume one spreadsheet formula fits every rubric.
Independent: write the feedback, not just the score
Design a three-line report for the 12/15 example: “80% across three eligible criteria”; “Reasoning: 3/5, because some claims lacked support”; “Next time: match each claim with one relevant piece of evidence.” Then add a disclosure: “Live speaking excluded under written-only task.” This is more useful to a pupil and parent than “Good job — 80%.”
A practical next-step checklist for different readers
For students: highlight the actual task requirements before submitting. When a criterion seems irrelevant, ask the teacher early rather than deciding that it is N/A yourself. After receiving feedback, revise the lowest applicable criterion with a fresh example.
For parents: ask which criteria applied, what was excluded and why, and what one improvement would transfer to the next task. Avoid comparing a child’s percentage with another project until the rubrics and conditions are known.
For teachers: establish exclusion rules before grading, document the reason, maintain a consistent denominator or weighting method, and check sample cases. If a rubric is used for different approved formats, publish a note about which criteria are in scope. Keep an audit trail for any adjustment.
What progress would we actually observe?
At the basic level, a learner can identify that N/A and zero mean different things. At the next level, the learner correctly recalculates a score under an authorised exclusion. At the independent level, the learner can read an unfamiliar rubric, identify its weighting method, explain the denominator and propose the next task-specific improvement.
The most valuable evidence may be the quality of the revision rather than a percentage change. A child who can use feedback to repair weak reasoning in a new paragraph demonstrates transfer even before the next formal assessment arrives.
FAQs
Can a pupil request N/A to improve the grade?
A pupil can ask why a criterion applies, but it is the authorised assessor and task policy — not the desired score — that determine whether N/A is appropriate. The explanation should be documented and consistent.
Is 12/15 always better than 12/20?
No. Both fractions are mathematically correct calculations for different possible maxima. The educational question is which maximum actually applies. There is no universal permission to remove a criterion.
What if a required criterion cannot be assessed because of a technical problem?
Record the missing evidence and seek the teacher’s approved remedy, such as reassessment, an alternative task or a documented institutional procedure. Do not pretend the student was awarded or denied points without a basis.
May I compare percentages from two different rubrics?
You may describe the percentages, but a fair comparison also checks whether the tasks, criteria, maximums, weights and expectations are genuinely comparable. A percentage alone does not prove equal difficulty or performance.
A fair rubric is a learning map
The core aim of assessment is not to manufacture an attractive number. It is to show what the learner can do, what remains unclear and what to practise next. When the denominator tells the truth, a mark becomes a better starting point for that conversation.
For related work, read comparing rubric scores with different maximum marks and calculating weighted assessment totals. The eduKate Education Hub connects assessment to wider learning, while the Clementi Mathematics tutorial reference illustrates diagnosis-first feedback and independent checking.