Exercise 38 Page 155

To convert 4 lb 7 oz to only ounces, we need to convert 4 lb to ounces and then add that to the 7 oz we already have. Converting between pounds (lb) and ounces (oz) will involve using a conversion factor. 16oz/1lbMultiplying 4lb by this conversion factor will convert it to ounces.

4 lb* 16 oz/1 lb

MoveLeftFacToNum

a*b/c= a* b/c

4 lb * 16 oz/1 lb

CrossCommonFac

Cross out common factors

4 lb* 16 oz/1 lb

SimpQuot

Simplify quotient

4 * 16 oz/1

DivByOne

a/1=a

4 * 16 oz

Multiply

Multiply

64 oz

We get the total amount of ounces by adding the original 7 ounces to 64. 64+7 = 71 oz.