Timed: add 4-digit multiples of 100

Add 4-digit multiples of 100. How many can you answer in a minute?

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Double a 5-digit multiple of 1,000.

Add two 5-digit multiples of 1,000 together. How many can you answer in a minute?

Double a 5-digit multiple of 1,000. How many can you answer in a minute?

Add three multiples of 10,000. How many can you answer in a minute?

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