Remember the MAD method.
M ultiply
A dd
D enominator the same
1/10 + 1/5 + 1/2
Make common denominators (number on bottom) (10 in this case).
What is done to the bottom must be done to the top.
5 x 2 = 10; 1 x 2 = 2 2 x 5 = 10; 1 x 5 = 5
1/10 + 2/10 + 5/10
Add numerators (number on top).
1 + 2 + 5 = 8
Keep the denominator the same.
8/10
Simplify.
8 and 10 can both be divided by 2.
8 / 2 = 4; 10 / 2 = 5
4/5
Answer: She sent 4/5 of an hour doing the activities.