60, 72, 84, 90 and 96 are tied with 12 factors each.
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100-0 = 100
To have an odd number of factors, the number must be a square. The only squares between 80 and 100 ()inclusive) are 81 and 100 but 81 does not have a factor of 5, and 100 has 9 factors. Thus the problem (as stated) has no solution. The numbers which have a factor of 5 must end in 0 or 5; the only numbers between 80 and 100 (inclusive) which match this criteria are {80, 85, 90, 95, 100}, which have {10, 4, 12, 4, 9} respectively. If you meant 3 PROPER factors (ie all the factors excluding the number itself), then 85 and 95 both have 3 proper factors.
A natural number is any positive number that is not 0. Any natural number multiplied by 100 is 100 times the number, or the original number with two 0's added to the end. For example, 2 times 100 is 200. 100 times 100 is 10,000.
0 is not a composite number. A composite number has two or more positive integer factors. Zero has none.
The mixed number is unnecassary, since 0 < 0.31 < 1. But:Converting 0.31 into a fraction gives 31/100, and 0/1 = 0. Thus, we have:0 31/100 = 31/100