ffirs.indd

Subtraction 121
Test you rself
Try these for yourself:
a) 13 – 8 =
b) 17 – 8 =
c) 12 – 9 =
d) 12 – 8 =
e) 124 – 88 =
f) 161 – 75 =
g) 222 – 170 =
h) 111 – 80 =
i) 132 – 85 =
j) 145 – 58 =
How did you do? They are easy if you know how. Here are
the answers:
a) 5 b) 9 c) 3 d) 4
e) 36 f) 86 g) 52 h) 31
i) 47 j) 87
If you made any mistakes, go back and read the explanation and try
them again.
EASY WRITTEN SUBTRACTION
Easy subtraction uses either of two carrying and borrowing methods.
You should recognize one or even both methods.
Th e diff erence between standard subtraction and easy subtraction
is minor but important. I will explain easy subtraction with two