Question

You have 8 cups of flour. A recipe calls for 2/3 cup of flour. Another recipe calls for 1/4 cup of flour. How much flour do you have left after making the recipes?

Answer 1

8/12+3/12= 11/12 cup of flour used. 8-11/12= 7 1/12 cups of flour left

Answer 2

8 - 2/3 - 1/4 = ?

Well, first let's find a common denominator:

Well 12, is the LCM of 3 and 4, so that should be it.

8(12)/12 - 2(4)/12 - 1(3)/12

96/12 - 8/12 - 3/12

96/12 - 11/12 = 85/12

You will have 85/12 cups of flour.