Question

Explain how using basic facts can help you find 10x20x30x40 mentally.

Answer 1

You know that anything times a one is that number, so multiply 2,3, and 4, and then multiply that by one. once you get the answer, put the zeros behind each multiplied number behind your answer, and there you go.

2×3×4= 24×1=24
there are 4 zeros
240,000