An artist can paint 4 paintings in 2 hours. what is the artists unit rate

Since he can paint four paintings in two hours we must find how many paintings he can create in one hour. So if we divide the numerator and denominator by two, we get that he can paint two paintings in one hour. His unit rate is 2:1.

4:2 divide by two to make the denominator 1

2:1 solution has 1 in the denominator