Answer:
A: 5/4
B:7/9
C: 14/15
D: 3/10
E: 2/12
F: 5/12
Step-by-step explanation:
a. 2/4 + 3/4 = 5/4 = 1 1/4
b. 6/9 + 1/9 = 7/9
c. 9/15 + 5/15 = 14/15
d. 7/10 - 4/10 = 3/10
e. 3/12 - 1/12 = 2/12 = 1/6
f. 8/12 - 3/12 = 5/12