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 number patterns 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.
Which number is missing?
12,34,56,,100The answer is 78. A child who answers 100 probably counted one group too many or too few.
Which number is missing?
2,15,,41,54The answer is 28. A child who answers 15 probably started counting from the wrong number.
Which number is missing?
3,6,,12,15The answer is 9. A child who answers 10 probably counted one too many or too few.
What comes next?
15,75,375,1,875The answer is 9,375. A child who answers 1,880 probably added instead of multiplying.
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.