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640 divided by 30 is equal to 21 with a remainder of 10. This can be calculated by dividing 640 by 30, which equals 21 with a remainder of 10. The remainder represents the amount left over after dividing as evenly as possible.
Well, isn't that a happy little math problem! When we divide 640 by 30, we get 21 with a remainder of 10. It's okay to have a remainder - it just means we have a little bit left over, like a squirrel saving a nut for later.