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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 has 8 bags with 9 cards in each, then gives away 35. How many does he have now?
The answer is 37. A child who answers 72 probably answered the first half and stopped.
Mia has 3 bags with 5 cards in each, then finds 1 more. How many does she have now?
The answer is 16. A child who answers 9 probably added instead of multiplying.
Noah has 10 bags with 7 blocks in each, then finds 25 more. How many does he have now?
The answer is 95. A child who answers 45 probably took away instead of adding.
Lucas has 4 bags with 2 pencils in each, then gives away 1. How many does he have now?
The answer is 7. A child who answers 9 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.