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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.
not always
never
always

Q 2: 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.
True
False

Q 3: Check multiplication for 255x49=12,495. Round both factors down and multiply that is 200x40=8000. Round both factors up and multiply that is 300x50=15,000. 8000 < 12,495 < 15,000
The original number is equal to one of the estimated products.
The original number does not falls between estimated products.
The original number falls between estimated products.

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

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