its for my homework im 9 im in p6 and my teacher will crack me! help ME!
2007-03-20 09:33:10 · 6 answers · asked by Sean K 1 in Education & Reference ➔ Homework Help
start by dividing each number by the first prime number (2)
60 divided by 2 = 2 x 30
then divide by 2 again if possible = 2 x 2 x 15
now we can't divide 15 by 2, so what is the next prime number???? 3
so it becomes 2 x 2 x 3 x 5......end of prime factorising.
Do the same with 105 dividing by the lowest prime number first. this time we can't divide by 2 first, so we look at 3
105 divided by 3 = 3 x 35
this then becomes 3 x 5 x 7 ........end again.
so you are left with the prime factors of 60 = 2 x 2 x 3 x 5
prime factors of 105 = 3 x 5 x 7
its a lot easier than it seems, but once you can do this you will breeze through some of secondary school work....
2007-03-20 10:45:00 · answer #1 · answered by squeegy 4 · 2⤊ 0⤋
Factors of 60 are 2 x 2 x 3 x 5.
Factors of 105 are 3 x 5 x 7.
If it's the highest common factor that you want, it's 3 x 5 which is 15.
2007-03-20 09:44:59 · answer #2 · answered by yprifathro 3 · 2⤊ 0⤋
These are the 60 factors 2^2, 3^1, 5^1
These are the 105 factors 3^1, 5^1, 7^1
2007-03-20 09:47:49 · answer #3 · answered by Big Foot 1 · 0⤊ 0⤋
Do you want Common prime factors or prime factors of the numbers individually?
If the answer is former, then the factors are :
3 and 5
If the answer is the latter, then the factors are:
60
3, 2, 5.
105
3, 5, 7
2007-03-20 09:52:46 · answer #4 · answered by gamma_wave 3 · 0⤊ 0⤋
60: 2 2 3 5
105: 3 5 7
2007-03-20 12:15:05 · answer #5 · answered by nrhoops911 2 · 0⤊ 0⤋
What you do is take your number and seperate it into facors until they are all prime factors.
60
/ \
15 X 4
/ \ / \
3X5 X 2X2
You can do the same thing for 105. (3x5x7)
2007-03-20 09:55:28 · answer #6 · answered by Anonymous · 1⤊ 0⤋