ffirs.indd

Subtraction 119
The answers are:
a) 48 b) 33 c) 127
d) 353 e) 466 f) 1,529
For a) you would subtract 40 and add 2.
For b) you would subtract 10 and add 1.
For c) you would subtract 60 and add 3.
For d) you would subtract 100 and add 30.
For e) you would subtract 200 and add 15.
For f ) you would subtract 2,000 and add 100, then 5.
In each case there is an easy subtraction and the rest is addition.
NUMBERS AROUND 100
When we subtract a number just below 100 from a number just
above 100, there is an easy method. You can draw a circle below
the number you are subtracting and write in the amount you
need to make 100. Th en add the number in the circle to the
amount the fi rst number is above 100. Th is turns subtraction into
addition.
Let’s try one.
23
123 – 75 =
25
Seventy-fi ve is 25 below 100. Add 25 to 23 for an easy answer of 48.
Let’s try another.