When a student keeps making the same mistake: a guide for Kumon instructors

Put a few relevant attempts beside each other. What is the same about the errors? Where does the student’s work first depart from the task? Include a correct attempt when one is available so you can compare the process, not just the final marks.

Replace “careless with subtraction” with an observation such as “used addition on two subtraction items after a run of addition items.” Replace “doesn’t understand the story” with “answered from the opening sentence even though the question asks about the ending.” These descriptions leave you with something concrete to investigate.

Do not conclude that a particular cause is established by a few wrong answers. Reading a direction differently, copying a number incorrectly, and applying an unsuitable method can produce similar-looking results. The next step is to watch an attempt closely enough to distinguish your possibilities.

Choose an item appropriate to the student’s current work and ask them to show how they would begin. Keep the invitation neutral: “Show me what you do first,” or “Point to the part that tells you what to find.” Let the student demonstrate without requiring a long spoken explanation.

Watch where they look, what they write, and where they pause. If your question already names the missed operation or points to the answer, record that support. A correct response after a revealing prompt answers a different question from a correct independent attempt.

For example, a student may read the operation correctly when asked to inspect it, but skip that step while working alone. That observation gives you a specific starting point. It does not establish a diagnosis, a lack of effort, or a need to change the entire study plan.

Decide what you want the student to notice before you speak. Use the least revealing prompt that is useful for this student and task, then give them time to act on it. Avoid a rapid series of hints that turns your reasoning into their answer.

• To revisit the task: “What is this question asking you to find?”
• To compare with a worked example: “Which part of the example could help you check this step?”
• To locate evidence in reading: “Where in the passage did you find that information?”
• To inspect written work: “Compare the number in the question with the number you copied.”

These prompts offer different amounts of help. The last one identifies where to look quite directly, so do not treat success after it as equivalent to finding the issue alone. If the prompt is not useful, reconsider your interpretation and follow your instructional process for further support.

For assistants, agree on what to observe and when to bring the work to the Instructor. A useful escalation is “Here are the attempts and the prompt I used,” rather than an unsupported recommendation to increase or reduce assigned work.

After a correction, use a suitable comparable item within the student’s planned work to see what they do without repeating the same hint. Keep the task close enough that you are checking the process you just discussed. A much harder item introduces new questions; an identical answer may only show that the student remembers the correction.

In a fictional example, a student changes an addition response to subtraction after a prompt. On the next suitable subtraction item, the instructor watches whether the student identifies the operation before calculating. The observation is about that step, not a declaration that subtraction is now mastered.

Check again during a later appropriate opportunity. Record the conditions: independent, after a general reminder, or after a specific hint. Do not impose a universal number of correct answers as a mastery rule. Use the student’s wider work and your established guidance when making instructional decisions.

Our session review routine offers a place for a later check. The purpose here is narrower: establish whether this particular correction carries into another attempt.

Keep the observation in your existing instructional records. Write enough for the next person to avoid starting with the same untested explanation. A compact note can include the task, the observed pattern, the support given, and the next check.

“Understood after help” leaves out the most useful detail: what the help was. If your note cannot tell you what to watch next, make it more specific rather than longer. For a broader planning conversation, see our guide to clear student learning goals.

If the pattern matters for home study, explain it without turning a few attempts into a judgment about the child. For example: “We noticed the operation was missed on a couple of items. A prompt helped today. I’m going to watch the next independent attempt before deciding what support is needed.”

Agree on what the family should do through your normal center guidance. Avoid casually asking a parent to introduce a new method or add extra work. A useful request may be to note where the student pauses and bring the work back for review. Our home-study routine guide can support that conversation.

For your own review, look at whether notes distinguish independent work from prompted work, whether planned checks happened, and whether recurring patterns reached the Instructor. Those process checks are more informative than expecting every student to stop making errors on the same timetable.