The answer depends on why you found the factors.
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You could. All of the factors of 100 are factors of 200.
Factors refer to whole numbers, not decimals.
Once all the prime factors of a number have been found, the number of factors the number has and what they are can be found. I'd be finding the prime factors first before finding all the factors of a number, so I'd rather find all the prime factors as it means I can stop before I have to do more work in finding all the factors.
1720 860,2 430,2,2 215,2,2,2 43,5,2,2,2 The prime factors of 1720 aren't consecutive.
Add them up. The factors of 9 are 1, 3 and 9. The sum of the factors is 13.