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The mistakes behind most wrong answers
A wrong answer in factors, multiples and primes 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.
How many factor pairs does this number have?
100The answer is 5. A child who answers 9 probably counted the factors instead of the pairs.
How many factor pairs does this number have?
45The answer is 3. A child who answers 2 probably left out one and the number itself.
How many factor pairs does this number have?
24The answer is 4. A child who answers 5 probably counted one too many or too few.
Is this number a multiple of 2?
50The answer is yes. A child who answers no probably missed a factor that was there.
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.