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The rule that is taught in schools is that rounding is determined by the value of the next digit. If it is 4 or less you would simply remove all the digits after the point of rounding. If the digit is 5 or more, you remove all the digits after the point of rounding but also increase the final digit of the rounded number by 1.
Unfortunately, this method is flawed because it introduces a systematic bias in the way 5s are rounded.
0 does not need rounding;
1, 2, 3 and 4 should be rounded down;
6, 7, 8 and 9 should be rounded up.
The two main ways of rounding 5 is to ensure that the last "surviving" digit is always odd or always even. The IEEE 754 standard is to round to even.
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What is better rounding off to nearest ten or rounding off to nearest hundred?
In whole numbers, rounding to the nearest ten is better. And in decimals, rounding to the nearest hundreth is more accurate.
What is the rule for decimals?
There are several rules for decimals, depending on what you want to do.
What is the greatest whole number that rounds to 300000?
599999 if rounding to the nearest 300000 with no rounding up to the nearest 300000 multiple. Granted normally you would not define your rounding rule that way, but there is no fixed rounding rule.
Why do decimals repeat?
Decimals repeat because there is no definite end. In these, you can end the repeat by rounding up... (Exp: 4.44444444444444... would be 4.45 or 4.445 or 4.4445, etc.
How do you round 95.625 to the nearest hundresth of a millimeter?
Rounding decimals is very similar to rounding other numbers. If the thousandths place of a decimal is four or less, it is dropped and the hundredths place does not change. For example, rounding 0.843 to the nearest hundredth would give 0.84.
