Why does 4 x 10 = 40?

Because adding 4 10's together makes 40.

That is, because 101 + 102 + 103 + 104 = 40.

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Why does 4 x 10 = 40?

Because adding 4 10's together makes 40.

That is, because 101 + 102 + 103 + 104 = 40.

Keep practicing