Teaching a Child to Check Their Own Work, and Actually Find the Mistake

"Check your work" is the most common instruction given before an exam and the least useful, because almost no child is ever taught what checking means.

Told to check, most children read their answers again. They see what they meant to write rather than what they wrote, find nothing, and hand the paper in. Re-reading is not checking. It is re-reassuring.

Checking is a skill, and like any skill it can be taught at home in a few weeks. This guide explains why re-reading fails, the four checks that actually catch mistakes, how checking differs on multiple choice and written papers, and how to practise it with your child without turning every evening into a correction session.

Why re-reading fails

The brain reconstructs from memory. A child who wrote 47 when they meant 74 reads 74, because that is what they intended. Catching it needs a different route to the answer, not the same one again.

That is the whole principle behind good checking. Every useful check below approaches the answer from a new direction: from common sense, from the question wording, from the reverse calculation, or from the marks. None of them is "look at it again".

Four checks that actually find things

The second one is the highest yield in written papers. A child who has written a paragraph for a question worth one mark has lost nothing, but a child who gave two points where three were asked for has lost a mark they knew.

Working backwards, with examples

These are practice examples written for this guide, not official exam items.

• Subtraction. 503 minus 268 gives 235. Check by adding: 235 plus 268 is 503. If the addition does not return the starting number, something is wrong.
• Division. 144 shared among 6 gives 24. Check by multiplying: 24 times 6 is 144.
• Percentages. 20 per cent of 450 is 90. Check: 90 is a fifth of 450, and a fifth is 20 per cent.
• Equations. If 3x plus 5 equals 26, then x is 7. Check by putting 7 back in: 3 times 7 is 21, plus 5 is 26.

Each check uses a different operation from the original working, which is exactly why it catches slips that re-reading misses.

Count the marks, count the points

Teach one habit above all others: before leaving a question, compare the number of points written with the number of marks available. Three marks means three distinct points. Not one point said three ways.

This single habit is worth more in structured papers than any amount of extra content revision, and it takes a fortnight to become automatic.

What "distinct" means

Suppose a practice question asks: Give three ways of conserving water at home (3 marks).

• Weak answer: "Do not waste water. Save water. Use water carefully." That is one idea written three ways, and is likely to earn one mark.
• Strong answer: "Collect rainwater in tanks. Turn off the tap while brushing teeth. Reuse washing water to water plants." Three separate actions, three marks available.

Ask your child to number their points in the margin while practising. When the numbers match the marks, they move on.

On a multiple choice paper, checking is different

Do not re-do every question; there is not time and it invites second-guessing that usually makes things worse. Instead:

• Check the row numbers match the question numbers, every ten questions.
• Check no row carries two shaded bubbles.
• Check there are no blanks. There is no negative marking, so a guess is free.

Only change an answer if you can say why. First instinct on vocabulary and grammar is usually right, and changed answers are more often changed from right to wrong than the reverse.

Checking by subject

Practising it at home

When marking a practice paper together, do not point at the error. Say "there is one mistake in question four" and let them find it. Finding it is the skill; being told is not.

A two week routine

1. Days 1 to 3: after each practice set, your child runs the four checks out loud while you listen. Do not correct the checking, just let them practise saying it.
2. Days 4 to 7: mark the set, then tell them how many mistakes there are, but not where. They hunt.
3. Days 8 to 14: they check silently before handing work over, and you only mark afterwards. Keep a simple tally of mistakes they caught themselves.

Most children are surprised by how many errors they find once they are looking in the right way. That surprise is useful. It is the moment checking stops being a chore and starts being a way to win back marks.

Our guide to marking a paper at home covers the parent's side of this, and reading a marking scheme shows how marks are split inside a single question, which is what makes counting points possible. To practise checking on real style questions, try our KJSEA Mathematics sample paper with answers or the KPSEA Mathematics sample paper.

Frequently asked questions

How much time should my child leave for checking?

Enough to run the quick checks on every answer, which for most papers means the last few minutes. The point counting habit happens during the paper, question by question, so it needs no extra time at the end.

My child says checking is boring. What helps?

Make it a hunt rather than a duty. Telling them "there are two mistakes in this page" turns checking into a game with a clear finish, and finding a mistake feels like winning a mark back.

Should my child change answers on a multiple choice paper?

Only with a clear reason, such as a line in a passage or a rule they now remember. Changing on a feeling more often turns a right answer into a wrong one.

Is this useful for younger children too?

Yes. The "does it make sense?" and "did I answer what was asked?" checks work from the early grades. Working backwards fits as soon as a child knows the reverse operation.

For papers to practise on, the KJSEA Complete Revision Course and the KPSEA Complete Revision Course both keep the answers in a separate booklet, so a child can check their own work before anyone else sees it.