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Grade 4 - Mathematics
3.34 Checking Multiplication

There are different ways to check multiplication. Some of the commonly used methods are:

  1. Repeated addition which can be tedious
  2. Multiplying by changing the order of factors
  3. Estimation
Example: 25 x 3 = 69
Verification by repeated addition
25x 3 = 75
This can be verified as 25 + 25 + 25 = 125.
Hence verified.

Verification by changing the order of factors
25 x 3 can be written as 3 x 25
3 x 25 = 125
Hence verified.

Verification by estimation
25 can be approximated to 30.
Hence 30 x 5 = 150.
The original result 25 x 3 = 125.
125 can be approximated as 130.
Hence verified.

Directions: Answer the following.
Q 1: One way of checking multiplication is by changing the order of factors and multiplying again
False
True

 Q 2: The best way to check multiplication is by repeated addition.
not always
never
always

Q 3: To check the multiplication for 68x37=2516 you
37x68=2516
68+68+68+68+..............37times
37+37+37+37+..............68times

 Q 4: To check multiplication by estimation, round each factor to its greatest place value and then multiply. First round each factor DOWN and multiply. Then round each factor UP and multiply. The original product should fall between the two estimated products.
False
True

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 Question 6: This question is available to subscribers only!


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