Why does 4 x 5 = 20?

Because adding 4 5's together makes 20.

That is, because 51 + 52 + 53 + 54 = 20.

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Why does 4 x 5 = 20?

Because adding 4 5's together makes 20.

That is, because 51 + 52 + 53 + 54 = 20.

Keep practicing