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Inverse Operations
4th and 5th grade
Two operations are said to be Inverse
to each other if one operation undoes
the effect of the other operation.
 Addition and subtraction are inverse
operations of each other.
 Multiplication and division are inverse
operations of each other

 The
inverse operation of
 18 + 10 = 28 is
 28 – 18 = 10.
 The inverse operation of
 14 x 3 = 42 is
 42 ÷ 14 = 3.
Let’s try a quiz on inverse operations.

What is the correct inverse operation of
400 – 250 = 150
a.
b.
c.
400 – 150 = 250
400 x 250 = 100,000
150 + 250 = 400
What answer did you choose?
If you chose, “C” then you were
correct. The inverse or opposite of
400 -250 = 150 is 250 + 150 = 400.

Let’s try another problem.
What is the inverse of this
problem?
24 x 3 = 72
a. 72 ÷ 24 = 24
b. 72 ÷ 24 = 3
c . 24 ÷ 3 = 72
What answer did you choose?

If you chose answer B, you were
correct.
The inverse operation of 24 x 3 = 73 is
72 ÷ 24 = 3.
How would you use the inverse operation
of addition to solve this problem?
40
+ m
76
-
76
40
36
How would you use the inverse operation
to find the answer to the following
problem?
8 x w = 32
The Inverse operation
is 32 ÷ 8 = w
w= 4