2006-10-31 05:09:11 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
GCF of 3, 6, 9 is 3 because
3 is prime
6 factors to 2 and 3
9 facts to 3 and 3
3 appears the greatest number of times
thus 3 is the Greatest Common Factor
2006-10-31 05:12:38 · answer #1 · answered by Anonymous · 0⤊ 1⤋
No, the largest they have in common is 5*7=35. You need to multiply all the prime factors that are common. Otherwise you only have the largest common PRIME factor.
2006-10-31 13:25:32 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It's just what the name implies. Factor each term and find the *largest* factor that they have in common. e.g.
3*3*5*7* = 315
5*7*13 = 455
so the GCF of 315 and 455 is 7
Doug
2006-10-31 13:18:36 · answer #3 · answered by doug_donaghue 7 · 0⤊ 1⤋
15 & 20
15=5*3
20=5*4
GCF=5
2006-10-31 13:34:41 · answer #4 · answered by prodigy 1 · 0⤊ 0⤋
12 & 18
12=6*2
18=6*3
GCF=6
2006-10-31 13:15:35 · answer #5 · answered by yupchagee 7 · 0⤊ 0⤋