Find the missing digit

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

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Just find the second number to make the total 100. A quick confidence booster at the start of the year.

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

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

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

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