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 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 100s. What is missing?
700800900?The answer is 1,000. A child who answers 901 probably counted one too many or too few.
Count by 100s. What is missing?
200?400500The answer is 300. A child who answers 400 probably counted the last one twice.
Count by 100s. What is missing?
300400500?The answer is 600. A child who answers 300 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.