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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 coins 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.
How much money is this?
10¢5¢5¢1¢The answer is 21¢. A child who answers 4¢ probably counted the coins instead of what they are worth.
How much money is this?
5¢1¢1¢The answer is 7¢. A child who answers 2¢ probably missed one while counting.
How much money is this?
10¢5¢1¢1¢1¢The answer is 18¢. A child who answers 19¢ probably counted one too many or too few.
How much money is this?
10¢10¢5¢The answer is 25¢. A child who answers 15¢ probably gave every coin the same value.
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.