Question

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

Answer 1

1*2*3*4*10000
6*4*10000
24*10000
240000

Answer 2

Hi Softballgirl6! I would say that first, we could pretend that the zeros don't exist because we could add those in later. Then just working with 1x2x3x4, we could mentally solve this to 24 and then add in the extra 4 zeros that we left out at the beginning. This brings the answer to 240000. Hope this helps! :)