For this case, the first thing to do is subtract both values. We have then: Joanie's bag of trail mix = 0.75 kilogram She and some friends eat = 0.5 kilogram Subtracting we have: 0.75 - 0.5 = 0.25 Kilogram number line all: 0 --- 0.25 --- 0.5 --- 0.75 number line when they ate trail mix: / 0 / --- /0.25/ --- /0.5/ --- 0.75 Remaining amount 0.25 kilograms Answer: 0.25 kilograms of trail mix are left