More sheets come with a subscription
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 taking away up to 20 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.
- 19−?=6
The answer is 13. A child who answers 32 probably took away instead of adding.
- ?−1=5
The answer is 6. A child who answers 5 probably started counting from the wrong number.
- ?−7=13
The answer is 20. A child who answers 19 probably counted one too many or too few.
- ?−1=10
The answer is 11. A child who answers 1 probably answered with one of the numbers shown.
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.