If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
If that is the case, then three is a factor of the original number.
No factor of 9 has three digits. 450 is a three-digit multiple of 150 (and of 9) with a digit sum of 9.
If they are multiples of 9, the digits add up to a multiple of 9.
It shows the relationship of factors to multiples. A factor times a factor equals a multiple of both of those factors.
450 or 900
5,631,683,557,500,000 is a multiple of 3 because its digits add up to a multiple of 3. It's a multiple of 5 because it ends in a zero. If it's a multiple of 3 and 5, it's a multiple of 15, so 15 is a factor of it.
Add up the digits of the given number. If they total a multiple of three, the number has three as a factor.
If the last two digits of your target number are a multiple of 4, 4 is a factor of the whole number.
Yes 18 times 2 equals 36 It is a factor, not a [proper] multiple.
15 or 35
Add up the digits of 291. If they total a multiple of 9, 9 is a factor.
No. To find if a number is a factor of 3, add the number's digits. If the resulting number is a multiple of 3, then the original number is a multiple of 3. In 4339, the digits of the number added together is 19, which is not a multiple of 3.
21 or 35
We can tell by applying the divisibility rules that 6 is not a factor of 208. For 208 to be a multiple of 6, it would have to be even and a multiple of three. Since the digits of 208 don't total a multiple of three, 208 is not a multiple of three and can't be a multiple of 6.
If you add all the digits up, and the total equals a number that 3 can go in, then it's a factor of 3.
Yes. If 492 is even, it has 2 as a factor. If its digits add up to a multiple of 3, it has 3 as a factor. If it has 2 and 3 as a factor, it has 6 as a factor.
The number is 35.
Yes, because the digits of 261 add up to a multiple of 3.
189 is a composite. Some quick tests, which can be done in your head: Check if the number is even (2 is a factor). Ones place will have 0,2,4,6, or 8 if even. Multiple of 5 (5 is a factor): Ones digit is 0 or 5. Multiple of 3 or 9: Add up the digits in the number; if this sum is 3 or a multiple of 3, then the original number is a multiple of 3 (3 is a factor). Additionally, if this sum equals 9 or a multiple of 9, then 9 is a factor. This is the case for 189 : 1+8+9=18, which is a multiple of 9. Since we found a factor (in addition to 1 & the original number) then the number is composite and not prime.