I don't know how to do area on a shape if it has missing numbers.. .also i need help on division with decimals...

Answer 1

This may help you with the area of different shapes.

http://www.mathsisfun.com/area.html

If you post a specific problem, I'll be glad to help you figure it out.

Study this site for division of decimals.

http://www.mathsisfun.com/dividing-decimals.html

Again -- I'll be glad to help you if you post a specific problem.