It's just like how 7x2 helps you solve 7x20. When multiplying a number with another number that's only followed by zeros are simple because all you do is add a zero. Example: 7x2= 14 7x20= 140 7x200= 1400 7x2000= 14000 Etc. I know there's a term for it, but I forgot because it's been a while since I've learned something like this
