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 counting by 5s, 10s and 100s 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.
Count by 10s. What is missing?
900910920?The answer is 930. A child who answers 921 probably counted one too many or too few.
Count by 10s. What is missing?
210?230240The answer is 220. A child who answers 230 probably counted the last one twice.
Count by 10s. What is missing?
960?980990The answer is 970. A child who answers 960 probably started counting from the wrong number.
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.