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Checking Multiplication
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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 < 15,000
The original number falls between estimated products.
The original number is equal to one of the estimated products.
The original number does not falls between estimated products.
Q 2
: One way of checking multiplication is by changing the order of factors and multiplying again
True
False
Q 3
: There are different ways to check multiplication. Choose the correct answer.
all the other answers
Repeated addition which can be tedious large numbers
changing the order of factors and multiplying again
Estimation lets you know if your answer is "about right"
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