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.
$5 a child a month, never more than $12 for the family. The first 7 days are free and need no card.
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The mistakes behind most wrong answers
A wrong answer in ten more, ten less 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.
What is 10 more than 71?
71The answer is 81. A child who answers 72 probably lost track of the ten.
What is 10 more than 21?
21The answer is 31. A child who answers 21 probably started counting from the wrong number.
What is 10 more than 33?
33The answer is 43. A child who answers 23 probably took away instead of adding.
What is 10 less than 92?
92The answer is 82. A child who answers 102 probably added instead of taking away.
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.