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### Grade 4 - Mathematics3.34 Checking Multiplication

 There are different ways to check multiplication. Some of the commonly used methods are: Repeated addition which can be tedious Multiplying by changing the order of factors 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: 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 < 15,000The original number falls between estimated products.The original number does not falls between estimated products.The original number is equal to one of the estimated products. 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.FalseTrue Q 3: There are different ways to check multiplication. Choose the correct answer.Repeated addition which can be tedious large numberschanging the order of factors and multiplying againEstimation lets you know if your answer is "about right"all the other answers Q 4: To check the multiplication for 68x37=2516 you37+37+37+37+..............68times68+68+68+68+..............37times37x68=2516 Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!