Multiplying Decimals by Powers of 10 — Rules & Examples

Remember back to first grade, where the whole class was learning addition. You, being the advanced math student, already learned multiplication.

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One day, your teacher, who was trying to give out busy work, told the whole class to add one thousand $7$s together. Since your classmates didn't know the power of multiplication, they started to painstakingly add the $7$s together. However, you, being a smart kid, didn't want to waste your time, so you used multiplication instead.

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What number did you get?