adding and subtracting fractions

what is 2/5 + 4/10 =

• 8/10

• 6/15

• 8/15

• 11/8

9/15 + 7/30 =

• 16/45

• 45/ 16

• 25/30

• 25/ 45

what is 3/4 + 5/11

• 50/40

• 1 11/40

• 8/15

• 15/8

what is 7/4- 6/5

• 11/20

• 1/9

• 8/20

• 20/20

what is 7/15 - 8/30

• 15/45

• 5/30

• 7/15

• 8/30

8/20 - 15/ 40

• 1/40

• 23/40

• 60/23

• 25/35