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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: One way of checking multiplication is by changing the order of factors and multiplying againFalseTrue 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 < 15,000The 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 you68+68+68+68+..............37times37x68=251637+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.FalseTrue Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!