2006-09-20 06:37:34 · 5 answers · asked by jennifer p 1 in Education & Reference ➔ Homework Help
Notice that 3 + 5 +1 =9, so your number is divisible by 9.
So 351 = 9 * 39.
Now go to work on 39. 3 + 9 = 12, so 39 is divisible by 3,
and 39 = 3*13.
Since 13 is prime, our final answer is
351 = 3^3 *13.
2006-09-20 07:02:05 · answer #1 · answered by steiner1745 7 · 0⤊ 0⤋
Step 1: Check out the easy factors.
1.) The number is odd, so 2 is not a factor.
2.) The digits add up to 9, so 9 is a factor.
351 / 9 = 39
Other easy factors:
Number ends in 10 (factors are 2 and 5), number ends in 5 (factor is 5).
Step 2: Take the reduced number, and look for factors.
39 - the digits add up to a multiple of 3 (12), so 3 is a factor
39 / 3 = 13
13 is a prime number, thus, the prime factors are 3 and 19. It may be expressed as 19 * 3^3
2006-09-20 06:42:06 · answer #2 · answered by ³√carthagebrujah 6 · 0⤊ 0⤋
13(3^4).
2006-09-20 06:45:45 · answer #3 · answered by l;wksjf;aslkd 3 · 0⤊ 0⤋
I'm not great at math... but I thought I'd challenge myself with your question
I think the answer is 3 x 3 x 3 x 13
Check it.
2006-09-20 06:46:40 · answer #4 · answered by Miss T. 2 · 0⤊ 0⤋
(3**3)*13
2006-09-20 06:40:56 · answer #5 · answered by Ralfcoder 7 · 0⤊ 0⤋