Estimate the sum (4505 + 27807 + 21397) to the nearest thousand.
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Solution
4505 + 27807 + 21397 = 53709
In 53709 the last three digits i.e., 709 is greater than 500.
Hence, 1 will be added to the 4th last digit and the last three digits will become zero.
After rounding to nearest thousand we will get 54000.