Inverse Operations

Download Report

Transcript Inverse Operations

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