Yes it is, and the answer to this is 35.
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Yes. 315 ÷ 3 = 105
The multiples of 105 are divisible by 105, namely:105, 210, 315, 420, 525, 630, 735, 840, 945, 1050, ...105 is divisible by its factors: 1, 3, 5, 7, 15, 35, 105
105
If it's to be divisible by 5, it must end in 5 or 0. And if it's to be divisible by 3, adding the digits together must result in a multiple of 3.The smallest such number is 105; the largest is 990.Since 3 x 5 = 15, all three-digit multiples of 15 would qualify. Note that 105 = 15 x 7, and 990 = 15 x 66.
Technically, 105 can be divided by any number that strikes your fancy. (except zero!)But for it to result in a whole number, you must divide by a factor of 105. Factoring is usually just by done by dividing by numbers until you get all the numbers that work.A couple shortcuts to factoring:-All numbers are divisible by themselves and 1-If a number ends in a 2, 4, 6, 8, or 0, it is divisible by 2-If the digits of a number add up to a number that is divisible by 3, then the original number is divisible by 3-If a number ends in 5 or 0, it is divisible by 5-If the digits of a number add up to 9 (or a number that is divisible by 0), then it is divisible by 9105 ends in a 5, so it is divisible by 5. 5 and 21 are factors2+1 adds up to 3, so 21 is divisible by 3. 3 and 7 are factorsBe sure to multiply any unpaired factors together to get additional factors1, 3, 5, 7, 15, 21, 35, 105