I really hope I have posted this in the right section...

I have a exam coming up and having been out of school in a while I had needed to freshen up on a few things. I just needed help on dividing decimals without using a calculator to also work out sin-1 etc .

Just a few examples that I need help with : 7/9.22 ?

6/9.22 ?

I am also being asked to show Sin, Cos & Tan but without a calculator. I think if i did on a calculator it would be (7/9.22)sin-1 ?

Anyway, I would most prefer to be able to work out how to divide the decimal and then work out how to work out sin without calculator if anyone could help. Thank you!