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 tens and ones 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 many ones are in 73?
73The answer is 3. A child who answers 4 probably counted one too many or too few.
How many tens are in 20?
20The answer is 2. A child who answers 0 probably mixed up two similar numbers.
How many ones are in 39?
39The answer is 9. A child who answers 39 probably started counting from the wrong number.
9 tens and 3 ones make what number?
?The answer is 93. A child who answers 12 probably lost track of the ten.
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.