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The mistakes behind most wrong answers
A wrong answer in place value to a million 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.
The first 9 is worth how many times the second 9?
491,879The answer is 10,000. A child who answers 100,000 probably put the digits one place out.
The first 2 is worth how many times the second 2?
240,412The answer is 100,000. A child who answers 5 probably counted the columns instead of multiplying by ten.
What is the 4 worth in this number?
4,593The answer is 4,000. A child who answers 4 probably gave the digit instead of what it is worth.
What is the 5 worth in this number?
9,357The answer is 50. A child who answers 9,357 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.