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The mistakes behind most wrong answers
A wrong answer in adding and taking away big numbers 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.
- 86,384+13,237=?
The answer is 99,621. A child who answers 99,622 probably counted one too many or too few.
- 21,178+8,842=?
The answer is 30,020. A child who answers 12,336 probably took away instead of adding.
- 98,634+450=?
The answer is 99,084. A child who answers 98,984 probably lost track of the ten.
- 92,635−65,778=?
The answer is 26,857. A child who answers 158,413 probably added instead of taking away.
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.