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 a hundred more, a hundred 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 100 less than 791?
791The answer is 691. A child who answers 791 probably started counting from the wrong number.
What is 10 more than 454?
454The answer is 464. A child who answers 455 probably lost track of the ten.
What is 100 more than 101?
101The answer is 201. A child who answers 1 probably took away instead of adding.
What is 10 less than 615?
615The answer is 605. A child who answers 625 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.