Subtract a multiple of 100,000

Subtract a multiple of 100,000 from a 6-digit number. How many can you answer in a minute?

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Subtracting a multiple of 1,000 from a 6-digit number. How many can you answer in a minute?

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

Find the missing digit. How many can you answer in a minute?

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

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