1, 2, 3, 4, 5
Anything that doesn't have a fraction or decimal.
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There is some disagreement as to whether zero, a whole number, belongs to the set of natural numbers.
How about 37 cm, or 9 inches, or 5 metres?
Most fractions CANNOT be converted to a whole number, simply because they aren't whole numbers. For example, 1 1/2 is between the whole numbers 1 and 2. It is NOT equal to either 1 or 2 - or to any other whole number for that matter. Of course, you can round it to the nearest whole number, but that's not the same as "converting" it. Some numbers may be written as a fraction, but may in fact be whole numbers. For example, 6/2. In this case, just divide the numerator by the denominator - in this case, divide 6 by 2 - to get the equivalent whole number. But if the division has a remainder (when calculating on paper) or you get a number with decimals (if calculating on a calculator), then the number is NOT a whole number, and therefore you can NOT convert it to a whole number.
Some examples of zero integers are 0, -0, +0. Zero is considered an integer because it is a whole number and can be represented on the number line.
It means that you find the closest whole number. For example, if you have the number 5.8, rounding it to a whole number gives you 6 - since no other whole number is closer to 5.8.More generally, it can mean rounding to some multiple of a certain number. For example, 549 rounded to the nearest 100 (i.e., to the nearest multiple of 100) gives you 500 - since no other multiple of 100 is closer to 549.