Question

A painter can paint 180 square feet in 1/2 hour. how many feet can he paint in 2 hours

Answer 1

Well 1/2 is one quarter of 2 hours. so if he can paint 180 square feet is 1/2 hour multiply it by four to get 2 hours.  so 180 times 4 is 720.
He can paint 720 square feet in 2 hours

Answer 2

Here is what you could do you could take the 180 and multiply by 2