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It's generally accepted that when rounding off numbers that if the first figure to be discarded is 5 or more, the previous figure is increased by 1. 176.625 therefore becomes 176.63 to 2 decimal places.
When rounding off 79.904, we look at the digit in the thousandths place, which is 4. Since 4 is less than 5, we do not round up the digit in the hundredths place. Therefore, 79.904 rounded off to three decimal places is 79.904.
When rounding off 4.45, you look at the digit immediately to the right of the rounding position, which is 5 in this case. Since 5 is equal to or greater than 5, you round up the rounding position by adding 1 to it. Therefore, rounding off 4.45 to the nearest whole number would result in 5.
rounded to two decimal places after the decimal point: 6.73
Your 4.875 rounded off is 4.9 to one decimal. When rounding off to one decimal, we look at the second decimal. When the second decimal is 5 or more, we round the first decimal up by one. In this case, the second decimal is 7, and that means we round the first decimal, the 8, up by one, and that makes it 9. That's where the 4.9 came from.