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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: 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.TrueFalse Q 2: There are different ways to check multiplication. Choose the correct answer.changing the order of factors and multiplying againRepeated addition which can be tedious large numbersall the other answersEstimation lets you know if your answer is "about right" Q 3: The best way to check multiplication is by repeated addition.alwaysnot alwaysnever Q 4: One way of checking multiplication is by changing the order of factors and multiplying againTrueFalse Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!

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