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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 250 m to school and 550 m home again. How many meters is that?
The answer is 800. A child who answers 250 probably answered with one of the numbers shown.
Mia walks 400 m to school and 100 m home again. How many meters is that?
The answer is 500. A child who answers 550 probably counted one too many or too few.
Liam has a jug with 700 ml of water in it and pours out 300 ml. How many milliliters are left?
The answer is 400. A child who answers 1,000 probably added instead of taking away.
Ava pours 350 ml of juice into a jug, then 250 ml more. How many milliliters are in the jug?
The answer is 600. A child who answers 100 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.