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The first sheet at every level is free. A subscription gives you a new sheet whenever you want one — and the part paper cannot do: five minutes of practice a day that adapts to your child, and a weekly email naming exactly what they are stuck on.
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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.
Is this number a multiple of 2?
50The answer is yes. A child who answers no probably missed a factor that was there.
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.
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.