Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out.
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8000000000 or 8491038000
If the underlined digit in the number 677 is 6, you would round the whole number to 700. If the first 7 is underlined it would be 680.
680000
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62.09 to the nearest whole number is 62