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The mistakes behind most wrong answers
A wrong answer in teen numbers as ten and some more 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.
Ten and some more — how many altogether?
10+7=?The answer is 17. A child who answers 18 probably counted one too many or too few.
12 is ten and how many more?
12=10+?The answer is 2. A child who answers 10 probably answered with one of the numbers shown.
19 is ten and how many more?
19=10+?The answer is 9. A child who answers 19 probably started counting from the wrong number.
Ten and some more — how many altogether?
10+3=?The answer is 13. A child who answers 4 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.