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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 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.
9 tens and 3 ones make what number?
?The answer is 93. A child who answers 94 probably counted one too many or too few.
2 tens and 9 ones make what number?
?The answer is 29. A child who answers 92 probably mixed up two similar numbers.
9 tens and 8 ones make what number?
?The answer is 98. A child who answers 17 probably lost track of the ten.
How many tens are in 47?
47The answer is 4. A child who answers 47 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.