When the digit immediately to the right of your target (the place you're rounding to) is 5 or greater.
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89 if rounded to the nearest whole number
109.96 rounded to the nearest whole number is 110. When rounding a number, if the decimal portion is 0.5 or greater, the whole number is rounded up. In this case, the decimal portion (0.96) is greater than 0.5, so the whole number is rounded up to 110.
When the value 4,449 is rounded to two significant figures the number should be reported as 4,400
4 As the number after the decimal point is greater than 5 the number is rounded up
12, a whole number.