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Integers: Rule of Divisibility by 5

How many multiples of 15 are there between -200 and 200?
Correct. [[snippet]] For example, 200 is divisible by 5 but not by 3 since the sum of its digits ($$2+0+0$$) is not divisible by 3. The next closest multiple of 5 is 195, which satisfies the conditions for 3 and 5 and is thus divisible by 15. The least multiple is thus -195, and the greatest is 195. To count multiples, subtract the extremes, divide by 15, and don't forget to add 1: >$$\displaystyle \frac{195-(-195)}{15} + 1 = \frac{390}{15} + 1 = 27$$.
Incorrect. [[snippet]]
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