Question

if there is 2/3 of a bag of jelly beans, and Danny ate 1/4 of the bag last night, what fraction of the bag is left?

Answer 1

2/3-1/4=5/12
You could make the denominators common by finding the GCF

The GCF of 4 and 3 is 12

This means that 8/12-3/12 which would give you 5/12.

:)

Answer 2

You would do 2/3 * (1-1/4) = 2/3 * 3/4 = 1/2
1/2  of the bag would be left