Why does 10 x 4 = 40?

Because adding 10 4's together makes 40.

That is, because 41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49 + 410 = 40.

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Why does 10 x 4 = 40?

Because adding 10 4's together makes 40.

That is, because 41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49 + 410 = 40.

Keep practicing