Rounding off is a important part of mathematics and a very handy tool for everyday life.
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steps rounding off number
In whole numbers, rounding to the nearest ten is better. And in decimals, rounding to the nearest hundreth is more accurate.
When rounding off, the rule is, "If the first figure to be discarded is 5 or more then the previous figure is increased by 1. Following this rule then 650 is the result of rounding off numbers in the range 645 to 654. As 650 itself is not rounded off then there are 9 whole numbers that can be rounded to 650.
It depends on the degree of rounding.
It depends what you're rounding off to. If you're rounding off to the hundredths, you get 9.86 If you're rounding off to the tenths, you get 9.9 If you're rounding to the whole number, you get 10