Masses word problem

Question

Cade weighs 56 kilograms and his little sister weighs 19 pounds less. How much does his sister weigh?

Answer 1

Either convert kilograms to pounds or pounds to kilograms, to get the same units, then subtract

1 kilogram = 2.20462 pounds. Usually it's 1 kilo=2.2 lbs as a close approximation

56 kilos = 56(2.2) lbs = 123.2 lbs. Cade weighs 123.2 lbs His sister weighs 19 lbs less

123.2-19= 104.2 lbs

Or you could have converted the 19 pounds to kilos and subtracted

1 kilo = 2.2 lbs or 1 lb = 1/2.2 kilos 19 lbs = 8.62 kilos 19/2.2=8.62

subtract 8.62 from Cade's weight 56-8.62=47.38 kilograms = sister's weight

47.38 kilos = 104.2 lbs. approximately