You just have to divide the 1/2 a pound by 8, or equivalently multiply by (1/8):
(1/2)*(1/8) = 1/16 of a pound
When we prime factorize, we get 180=2^2*3^2*5. So therefore there are 3 prime factors that make up 180.
Answer is attached below.
11) 39 2/9
12) 21 1/10
13) 22 3/8
14) 6
15) 10 5/12
16) 5 19/24
17) 6 2/3
18) 16 1/24
19) 15 19/24
20) 10 7/8
