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The mistakes behind most wrong answers
A wrong answer in dividing with something left over is rarely random. These are the ones that come up most often, each on a real problem — worth knowing before you mark a sheet, because the fix for each is different.
How many whole times does it go in?
933÷7The answer is 133. A child who answers 2 probably gave the leftover instead of how many groups.
How many whole times does it go in?
460÷9The answer is 51. A child who answers 52 probably counted one group too many or too few.
How much is left over?
93÷7The answer is 2. A child who answers 13 probably answered the first half and stopped.
How much is left over?
29÷2The answer is 1. A child who answers 2 probably answered with one of the numbers shown.
In the app, every wrong answer is matched against mistakes like these, and the weekly email tells you which one your child keeps making — in those words, not as a percentage.