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The mistakes behind most wrong answers
A wrong answer in word problems 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.
Lucas has 4 buttons, then gets some more. Now he has 9. How many did he get?
The answer is 5. A child who answers 13 probably added instead of taking away.
Noah has 3 shells, then gets some more. Now he has 12. How many did he get?
The answer is 9. A child who answers 12 probably started counting from the wrong number.
Zara has 3 coins, then gets some more. Now she has 16. How many did she get?
The answer is 13. A child who answers 3 probably answered with one of the numbers shown.
Ava has 7 blocks, then gives some away. Now she has 6. How many did she give away?
The answer is 1. A child who answers 2 probably counted one too many or too few.
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.