It is: 690 to two significant figures
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686.98 rounded to the nearest whole number is 687. When rounding a decimal number to the nearest whole number, you look at the digit immediately to the right of the decimal point. If that digit is 5 or greater, you round the whole number up by 1. In this case, the digit to the right of the decimal point is 9, so we round 686.98 up to 687.
Two of them
Two of them
When the value 4,449 is rounded to two significant figures the number should be reported as 4,400
2.6