Answer:
a. 3/6 + 2/6 = 5/6
b. 11/5 + 23/10 = 63/10
c. 9/11 - 7/11 = 2/11
d. 311/20 - 14/5 = 1871/20 - 56/20 = 1815/20 = 90 3/4
e. 1/2 × 1/3 = 1/6
f. 3 × 5/6 = 15/6 = 2 3/6
g. 3/10 ÷ 6/10 = 3/10 × 10/6 = 3/6 = 1/2
h. 5/9 ÷ 3 = 5/9 × 1/3 = 5/27
i. 11/2 × 11/3 = 121/6 = 20 1/6
j. 21/2 ÷ 5/8 = 21/2 × 8/5 = 168/10 = 16 8/10 = 16 4/5