Would you choose to use a hundred chart to solve 90- 80? why or why. not ? if not. which strategy would work better?

I would use a tens chart because both numbers are multiples of 10, and there both under 100, so it would work out better if u use a tens chart, since the numbers are in the tens place and would give u a product of 10.

i hope this helps u 

I’m confused as to what you are asking 66 2/3 percentage wise