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Online Quiz (Worksheet A B C D)

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

Q 2: One way of checking multiplication is by changing the order of factors and multiplying again
True
False

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

Q 4: There are different ways to check multiplication. Choose the correct answer.
Repeated addition which can be tedious large numbers
changing the order of factors and multiplying again
all the other answers
Estimation lets you know if your answer is "about right"

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Question 6: This question is available to subscribers only!


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