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 668?
668The answer is 568. A child who answers 658 probably changed the wrong digit.
What is 100 more than 189?
189The answer is 289. A child who answers 189 probably started counting from the wrong number.
What is 100 more than 192?
192The answer is 292. A child who answers 92 probably took away instead of adding.
What is 100 less than 363?
363The answer is 263. A child who answers 463 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.