a) 4/5 + 1/10 = 8/10 + 1/10 = 9/10
b) 1/6 + 2/3 = 1/6 + 4/6 = 5/6
c) 2/3 + 1/5 = 10/15 + 3/15 = 13/15
d) 4/7 + 1/2 = 8/14 + 7/14 = 15/14 = 1 1/14
e) 8/9 - 1/3 = 8/9 - 3/9 = 5/9
f) 3/10 - 1/5 = 3/10 - 2/10 = 1/10
g) 4/5 - 2/3 = 12/15 - 10/15 = 2/3
h) 5/7 - 1/4 = 20/28 - 7/28 = 13/28
i) 2 2/5 + 3 1/2 = 2 4/10 + 3 5/10 = 5 9/10
j) 4 3/7 + 2 2/3 = 4 9/21 + 2 14/21 = 7 2/21
k) 2 3/8 + 1 1/6 = 2 9/24 + 1 4/24 = 3 13/24
l) 4 1/2 + 2 3/5 = 4 5/10 + 2 6/10 = 7 1/10
m) 4 1/4 - 2 2/3 = 4 3/12 - 2 8/12 = 1 7/12
n) 5 1/9 - 1 5/6 = 5 2/18 - 1 15/18 = 3 5/18
o) 3 1/15 - 1 1/10 = 3 2/30 - 1 3/30 = 1 29/30
p) 5 5/13 - 3 1/2 = 5 10/26 - 3 13/26 = 1 23/26
