One of the problems on the homework is as follows: 12 + 6. When Ann solved the problem she got an answer or 18. Which of the following methods can she use to check her answer?
a. 18 + 6
b. 18 x 6
c. 18 – 6
d. 18 + 12
Answer : c
Explanation:
The original problem is an addition problem. In this problem we combined or added the numbers 12 and 6 to come up with a total value of 18.
An addition operation is inverse to a subtraction operation because both operations are considered as equations since they have an equal sign (=) separating the left side from the right side. An equal sign means that what is on the left side should always equal what is on the right side.
Lets go back to our problem:
12 + 6 = 18 To check this we use the inverse which is subtraction and it could be either
18 – 6 = 12 or
18 – 12 = 6
From the list of answers above we choose C because that is the only correct inverse operation for our addition.
©Copyright 2007.Najwa S. Hirn. All rights reserved
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