Question

what is the prime factorication of 9 and 12

Answer 1

18

Answer 2

ok thanks but it it says find the lcm of each pair of numbers what do i do?

Answer 3

What, 18??

Answer 4

For 9 is 9,18,27,36,45,54,63 and 12 is 12,24,36,48,54,63,72

Answer 5

Cinty, the prime factorization of a number is writing it as the product of prime numbers. For example, 9 = 3x3, so the prime factorization of 9 is 3,3,
12 = 2x2x3, so the prime factorization of 12 is 2,2,3

Answer 6

hi im the one who posted the question

Answer 7

Hey

Answer 8

yeah i know but here it says USE THE PRIME FACTORICATTION TO FIND THE LCM OF EACH SET OF NUMBERS 4 AND 5 AND 6 AND 7 SOMEONE PLEASE HELP EXPLAI IT TO ME HELP

Answer 9

Cinty, relax. The LCM is the least common multiple. For 9 and 12, you look at the prime factorization of each (3,3, and 2,2,3) and if there is a number which appears in both, you can erase it from the one where the number appears a smaller number of times.
In this case, 3 appears in the prime factorization of both 9 and 12, so we remove it from the prime factorization of 12. This gives us 3,3 and 2,2. So our answer for lcm is 3x3x2x2 which is 36

Answer 10

OK THANKS HEY ARE YOU A GIRL OR GUY

Answer 11

LUSMINER im sorrrrry sorrry help me omg im cring right now help me

Answer 12

Cinty, what are you talking about? Relax!

Answer 13

ITS BECUSE IT WAS NOT 9 AND 12 IT WAS SUPOSED TO BE 21 UGHHH

Answer 14

ok.. calm down and write in lowercase, it's easier to read. You mean what is the lcm of 9 and 21?

Answer 15

yes put look at the directions list the mutiples to find the lcm of 9 and 21

Answer 16

Ok, well. You know how to do that now. Tell me what is the prime factorization of 9, and the prime factorization of 21

Answer 17

for 3 its /33/

Answer 18

you mean for 9 its 3,3. Yes

Answer 19

and for 21?

Answer 20

oh yeah

Answer 21

21?

Answer 22

i really dont know im sorry

Answer 23

Ok, so let's think. To find the prime factorization of a number, you have to write it as the product of prime numbers. Can you tell me 2 numbers that if you multiply them you get 21?

Answer 24

you can do this

Answer 25

3 times seven

Answer 26

Perfect. and both 3 and 7 are prime. So the prime factorization of 21 is 3,7

Answer 27

ok

Answer 28

ok, so now we have 9 : (3,3) and 21 : (3,7)

Answer 29

Do you notice any number that shows up in both sets?

Answer 30

thank u hey wanna do another one

Answer 31

3

Answer 32

not done yet cinty!

Answer 33

ok hey you see 3 two times

Answer 34

good, now, do you remember what the next step is? (scroll up if you don't)

Answer 35

mutiply them all together

Answer 36

yes, but before you do that, you have to remove the 3 from the set which has fewer 3s

Answer 37

so i erase it

Answer 38

Remember, our sets right now are (3,3) and (3,7)

Answer 39

yes, so which 3 are you erasing? and what do your sets look like now?

Answer 40

the top one i have 3 threes right
right now i have 3, 3,7

Answer 41

excellent. Now you can multiply :-)

Answer 42

ok now i have 3 ,3,7 correct

Answer 43

yes.. go on

Answer 44

ok yay were done hey do you live in tx

Answer 45

we're not done cinty!! You still have to multiply these numbers so we can have an answer that is one number!

Answer 46

ok so 3times 3 times 7 =

Answer 47

= ...?

Answer 48

63

Answer 49

very good. that is the lcm of 9 and 21

Answer 50

ok so wanna do one or two more

Answer 51

I want to watch you do 2 more :-)

Answer 52

ok sure correct me if i did it wrong ok

Answer 53

sure thing

Answer 54

go ahead

Answer 55

ok

Answer 56

18 and 24

Answer 57

step one what times what equals 18 right

Answer 58

yes

Answer 59

there is a problem 2 3 689 hve 18 in them what do i do

Answer 60

what do you mean?

Answer 61

2 has 18 3 has 18 9 has 18 in them

Answer 62

I don't understand what you mean by "has 18 in them" .. all you need is to find two numbers that multiplied by each other give you 18

Answer 63

ok well2 times 9 = 18

Answer 64

good. Now, 2 is prime, but 9 is not. So now you need 2 numbers that multiply by each other to give 9

Answer 65

3 times 3 now what

Answer 66

now, 3 is a prime number. So you now have 3 prime numbers! 2, 3, 3
What we just did looks like this: