## EmmaH 2 years ago Write the prime factorization, using 'x' between the numbers: 102 i dont understand whta it is asking and how to figure it out

1. whpalmer4

Do you know what a prime number is? A prime number is a number such as 2, 3, 5, 7 (but not 9!), 11, 13 which can't be evenly divided by any numbers except 1 and itself. A prime factorization is just figuring out which numbers need to be multiplied together to make the number you are factoring. For example, a prime factorization of 4 would be 2x2. 12 would be 2x2x3. Start by dividing by 2 as many times as you can, then try 3, 5, 7, 11, 13 up until you reach the point where the number you are about to try times itself > the number you are factoring. If I'm factoring 51, it isn't divisible by 2, so I try 3. 51/3 is 17. Now, 17 isn't divisible by 3, so I think about trying 5, but before I do, I check the value of 5*5, which equals 25. 25 > 17, so I don't need to go any further. The prime factorization of 51 is 3x17. Try it! If you get stuck, post what you've done and we'll have a look.

2. EmmaH

so find the factors of 102?

3. EmmaH

2,5,17,3

4. EmmaH

@whpalmer4 ?

5. AriPotta

factor treeeee

6. AriPotta

|dw:1359231211743:dw|

7. AriPotta

|dw:1359231316448:dw|

8. AriPotta

|dw:1359231333519:dw|

9. AriPotta

does that make sense?

10. EmmaH

wait ust 2.3.7?

11. AriPotta

yea. 2, 3, and 17 are the prime factors

12. EmmaH

but the prob saysd "; using 'x' between the numbers"

13. AriPotta

that's what i did. 2x3x17

14. EmmaH

oooh thanks

15. AriPotta

no problemo :)