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 measuring angles 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 degrees is this angle?
The answer is 165. A child who answers 175 probably counted one group too many or too few.
How many degrees is this angle?
The answer is 45. A child who answers 135 probably read the other ring of numbers on the protractor.
How many degrees is this angle?
The answer is 95. A child who answers 100 probably counted one too many or too few.
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.