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The mistakes behind most wrong answers
A wrong answer in measurement 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.
Ethan walks 3 km to school and 6 km home again. How many kilometers is that?
The answer is 9. A child who answers 3 probably answered with one of the numbers shown.
Mia walks 4 km to school and 1 km home again. How many kilometers is that?
The answer is 5. A child who answers 6 probably counted one too many or too few.
Liam has a jug with 7 l of water in it and pours out 3 l. How many liters are left?
The answer is 4. A child who answers 10 probably added instead of taking away.
Ava pours 4 l of juice into a jug, then 3 l more. How many liters are in the jug?
The answer is 7. A child who answers 1 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.