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After
getting an answer,
you may want to perform a mathematical check
to verify your answer.
Remember:
Addition/Subtraction and
Multiplication/Division
are opposite operations to one another.
So checking one operation with its opposite
is a good way to help verify your answer.
Example A:
Problem:
Check:
|
56
-42
14
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When
adding or subtracting
Simply do the 'opposite' operation in reverse.
To check
56-42=14
Add in Reverse.
14
+42
56 |
Example B:
Problem:
Check:
|
24
÷ 6 = 4
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When
multiplying or dividing
Simply do the 'opposite' operation in reverse.
To check
24÷6=4
Multiply in Reverse.
4
x 6 = 24 |
Sometimes a 'check' will require using both types of operations.
Example C:
Problem:
Check:
|
36
÷ 5 = 7 r1
|
In this
type of problem
we first check our division
by Multiplying in reverse.
Then we
Add the remainder to that total
to get 36.
To check
36÷5=7r1
Multiply in Reverse.
7 x 5 = 35
then add the remainder (r)
35 + 1 = 36 |
Remember:
Checking one
operation with its opposite
is a good way of verifying your answer.
Let's
Practice
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