Subtraction around the thousands boundary

Subtraction around the thousands boundary. How many can you answer in a minute?

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Subtract any 3 digit number from 1,000.

Subtracting a multiple of 10,000 from a 6-digit number. How many can you answer in a minute?

Subtract a multiple of 10 from 1,000. How many can you answer in a minute?

Subtract a multiple of 100 from 10,000. How many can you answer in a minute?

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