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The mistakes behind most wrong answers
A wrong answer in two-step problems with all four operations 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.
Kai shares 88 cards equally onto 8 plates, then eats 6 from one plate. How many are left on it?
The answer is 5. A child who answers 11 probably answered the first half and stopped.
Mia has 12 cards, then gets 39 more, and gives away 5. How many does she have now?
The answer is 46. A child who answers 56 probably added instead of taking away.
Mia has 85 stickers, then gets 9 more, and then 2 more. How many does she have now?
The answer is 96. A child who answers 92 probably took away instead of adding.
Noah has 94 blocks, then gives away 60, and gets 54 more. How many does he have now?
The answer is 88. A child who answers 89 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.