Question: First estimate the answer by using rounded numbers. Then calculate the exact answer with the calculator. Lastly find the error of estimation with a calculator.

First estimate the answer by using rounded numbers. Then calculate the exact answer with the calculator. Lastly find the error of estimation with a calculator. 34,809 75,162 (round to thousands) Estimation: ______ Exact Answer: ______ Error of Estimation: ______ Solution: Step 1 First round both the numbers. 34,809 becomes 35,000 75,162 becomes 75,000 Step 2 Add the rounded numbers. = 35,000 75,000 = 110,000 Step 3 Find the exact answer. = 34,809 75,162 = 109,971 Step 4 Error of estimation can be found by finding the difference between the exact answer and the estimated answer. = 110,000 - 109,971 = 29 Answer: Estimation: _110,000_ Exact Answer: _109,971_ Error of Estimation: _29_ Practice Problems. 1 9,758,234 - 1,857,832 (round to millions) Estimation: ______ Exact Answer: ______ Error of Estimation: ______ 2 3,674 x 4,908 (round to thousand) Estimation: ______ Exact Answer: ______ Error of Estimation: ______

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