Add a multiple of 1,000 (harder)

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

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

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

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

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

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