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The mistakes behind most wrong answers
A wrong answer in liters and grams in words 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 pours 250 ml of juice into a jug, then 550 ml more. How many milliliters are in the jug?
The answer is 800. A child who answers 250 probably answered with one of the numbers shown.
Mia pours 400 ml of juice into a jug, then 100 ml more. How many milliliters are in the jug?
The answer is 500. A child who answers 550 probably counted one too many or too few.
Liam has 700 g of sand and pours out 300 g. How many grams are left?
The answer is 400. A child who answers 1,000 probably added instead of taking away.
Ava puts a 350 g bag of flour on the scales, then adds a 250 g bag. How many grams is that?
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.