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The mistakes behind most wrong answers
A wrong answer in two-step 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.
Kai has 72 cards, then gives away 62, and gets 88 more. How many does he have now?
The answer is 98. A child who answers 10 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.
Noah has 93 blocks, then gets 5 more, and gives away 80. How many does he have now?
The answer is 18. A child who answers 19 probably counted one too many or too few.
Lucas has 34 pencils, then gives away 1, and gets 17 more. How many does he have now?
The answer is 50. A child who answers 16 probably took away instead of adding.
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.