Answer:

1) 4 29/40

2) 3/10

Step-by-step explanation:

1.

5 6/10 - 7/8

5 + 6/10 - 7/8

5 + (48-70) / 80

5 + -22/80

5 - 22/80

5 - 11/40

4 29/40

2.

1/10 + 1/5

1/10 + 2/10

3/10