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The mistakes behind most wrong answers
A wrong answer in reading a dot plot 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 altogether?
123456The answer is 7. A child who answers 3 probably counted the stacks, not the dots in them.
How many altogether?
123456The answer is 9. A child who answers 10 probably counted one too many or too few.
How many are at 2?
123456The answer is 1. A child who answers 2 probably read the stack next to the one asked about.
How many are at 5?
123456The answer is 2. A child who answers 9 probably counted the whole plot instead of the part asked for.
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.