All composite numbers can be expressed as unique products of prime numbers. This is accomplished by dividing the original number and its factors by prime numbers until all the factors are prime. A factor tree can help you visualize this.
Example: 210
210 Divide by two.
105,2 Divide by three.
35,3,2 Divide by five.
7,5,3,2 Stop. All the factors are prime.
2 x 3 x 5 x 7 = 210
That's the prime factorization of 210.
3, 12, 30
Yes, because the digits of 261 add up to a multiple of 3.
3 is a prime number. Prime numbers don't have factor trees. The factors of 3 are 1 and 3.
12
If the last two digits of your target number are a multiple of 4, 4 is a factor of the whole number.
200 / \ 20 10 / \ 10x10x10 / \ 5x2x10x10 / \ 5x2x5x2x10 / \ 5x2x5x2x5x2 really, a fifth grader knows this.
102
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.
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.
114 beacause it's three digits a factor of seven even
3, 12, 30
No factor of 9 has three digits. 450 is a three-digit multiple of 150 (and of 9) with a digit sum of 9.
Yes, because the digits of 261 add up to a multiple of 3.
150
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.
450 or 900
12