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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 13 cards, then gets 6 more, and then 1 more. How many does he have now?
The answer is 20. A child who answers 19 probably answered the first half and stopped.
Mia has 3 cards, then gets 8 more, and then 1 more. How many does she have now?
The answer is 12. A child who answers 13 probably counted one too many or too few.
Lucas has 6 pencils, then gets 1 more, and then 4 more. How many does he have now?
The answer is 11. A child who answers 3 probably took away instead of adding.
Kai has 15 cards, then gives away 12, and gives away 2 more. How many are left?
The answer is 1. A child who answers 5 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.