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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+9=?The answer is 19. A child who answers 20 probably counted one too many or too few.
Ten and some more — how many altogether?
10+2=?The answer is 12. A child who answers 10 probably answered with one of the numbers shown.
Ten and some more — how many altogether?
10+3=?The answer is 13. A child who answers 4 probably lost track of the ten.
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.
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.