2007-09-27 07:34:06 · 7 answers · asked by Ivonne G 1 in Science & Mathematics ➔ Mathematics
38 is obviously eve, so 2 is a prime factor of it.
What do you get when you divide 38 by 2?
Answer: 19.
Is 19 a composite?
Well, it is not divisible by 2 (since it is odd);
and 3 is not a factor (since the digits 1+9 add up to 10);
it does not end in a zero or 5, so 5 is not a factor.
Don't bother checking the next prime (7),
since 5 * 5 (=25) is greater than 19.
If 19 has no factors less than 5 then it cannot have any greater than 5.
Therefore, the only prime factors we can find for 38 are
2 and 19.
.
2007-09-27 07:43:46 · answer #1 · answered by bam 4 · 0⤊ 0⤋
Here's the method to find the prime factors of a number
38|2 write the smallest number which 38 can be divided with
19|19 To the left write the result of the division 38/2. then follow
1 | the same logic.
19 is a prime so it can only be divided by itself
The result is the numbers in the right. So it's 2 and 19.
2007-09-27 07:45:04 · answer #2 · answered by Orfeas 3 · 0⤊ 0⤋
19 and 2
2007-09-27 07:37:15 · answer #3 · answered by rogavit 3 · 1⤊ 0⤋
Answer: 19, 2
2007-09-27 07:41:23 · answer #4 · answered by mm 2 · 0⤊ 0⤋
1, 2 and 19.
1 is a prime number
2 is a prime number
19 is a prime number
38 is not a prime number.
2007-09-27 07:49:34 · answer #5 · answered by Feeling Mutual 7 · 0⤊ 2⤋
2* 19.
19 is prime.
2007-09-27 08:07:19 · answer #6 · answered by steiner1745 7 · 0⤊ 0⤋
7, 33, 3.5
2007-09-27 07:37:37 · answer #7 · answered by Nerdbot 5000 2 · 0⤊ 1⤋