Question

Martin made two type of cookies.He used 2/3 cup of sugar for one recipe and 1/4 cup for the other one. How much sugar did he use in all?

Answer 1

.916666666....

or 11/12.

Answer 2

You must add 2/3 and 1/4. You need a common denominator. The least common denominator of 3 and 4 is 12.

2/3 + 1/4 =

= 2/3 * 4/4 + 1/4 * 3/3

= 8/12 + 3/12

= 11/12

Answer: He used 11/12 of a cup of sugar.