102
9
12
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.
150
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.
144, 324, 576, 900
9
144
3 is a factor of the square number 9.
It is the square of any one of the four multiples of 6 between 10 and 31.
36
Oh, dude, a factor of the sum of the digits being 3 or a multiple of 3 just means that if you add up all the digits in a number and it equals 3, or if that sum is a multiple of 3, then that number has a factor that fits the bill. So, like, if you have a number where the digits add up to 3, or 6, or 9, or any multiple of 3, you've got yourself a match! It's like finding a snack in your pantry that fits your cravings perfectly – it just works out, man.
114 beacause it's three digits a factor of seven even
144, 324, 576 and 900 are even three-digit square numbers that are multiples of 3.
12
3, 12, 30
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.