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Checking Multiplication
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Q 1
: The best way to check multiplication is by repeated addition.
not always
never
always
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 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.
False
True
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Question 6: This question is available to subscribers only!
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