Answer:
The solution of the subtraction exercises are given as follows,
a) 10 – 2 = 8
b) 14 – 6 = 8
c) 15 – 9 = 6
d) 17 – 8 = 9
e) 13 – 5 = 8
f) 11 – 8 = 3
g) 20 – 8 = 12
h) 16 – 7 = 9
i) 12 – 9 = 3
j) 21 – 9 = 12
k) 11 – 6 = 5
l) 5 – 5 = 0
m) 4 – 0 = 4
n) 16 – 8 = 8
o) 10 – 5 = 5
p) 18 – 7 = 11
q) 13 – 8 = 5
r) 12 – 4 = 8