Ages 9–10🧮 Mathematics9 verified questions on this shelf
Checking Answers by Rounding
Use rounding to check answers to calculations and determine appropriate levels of accuracy in context
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Question 1 of 3
A student adds 23,874 and 26,657. She rounds each number to the nearest thousand, gets 24,000 + 27,000 = 51,000, and uses this estimate to check her work. Which of the following could be the exact sum?
Question 2 of 3
The exact sum of 47,832 and 23,156 is 70,988. Which rounded estimate would you use to check if this answer is reasonable?
Question 3 of 3
Leo is adding the number of tickets sold at two movie theaters. Theater X sold 12,374 tickets and Theater Y sold 9,861 tickets. He wants a quick estimate that is guaranteed to be within 200 tickets of the exact total, while keeping his work as simple as possible. Which level of rounding should he use for each addend before adding?
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