kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

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

Q 2: 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 does not falls between estimated products.
The original number is equal to one of the estimated products.
The original number falls between estimated products.

Q 3: To check the multiplication for 68x37=2516 you

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.

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!

Subscription to kwizNET Learning System offers the following benefits:

  • Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
  • Instant scoring of online quizzes
  • Progress tracking and award certificates to keep your student motivated
  • Unlimited practice with auto-generated 'WIZ MATH' quizzes
  • Child-friendly website with no advertisements
  • Choice of Math, English, Science, & Social Studies Curriculums
  • Excellent value for K-12 and ACT, SAT, & TOEFL Test Preparation
  • Get discount offers by sending an email to

Quiz Timer