Katherine solved 2 7/8 X 5 3/8. Her work is shown below. What error did she make and what is the correct answer?

Her work: 2 7/8 X 5 3/8 =

First you multiply fractions: 7/8 X 3/8= 21/ 64

Then multiply the whole numbers: 2 X 5 = 10

Therefore, the solution is 102164

Her work: 2 7/8 X 5 3/8 =

First you multiply fractions: 7/8 X 3/8= 21/ 64

Then multiply the whole numbers: 2 X 5 = 10

Therefore, the solution is 102164