Question

Explain how you can use mental math to compare 7 pounds to 120 ounces.

Answer 1

You could use mental math if you know how many ounces = 1 pound, which is 16, so you could easily multiply 16 times 7 in your head which will equal 112, and you could see dat 120 ounces > 7 pounds, (120 ounces is greater than 7 pounds), and DAT'S how you could use mental math! =D
I hope I helped! =D

Answer 2

16 oz=1 pound
we either convert 7 pounds to oz or 120 ounces to pound
I would ocnvert ounces to pounds since it is bigger to make it smaller
120/16=60/8=30/4=15/2=7.5

120oz=7.5pounds

so we compare 7 to 7.5 (pounds)