more math help! =3?

Question

okie here are the problems and ps thx everyone!

1. find the gcf (greatest common factor) of 60, 72, and 36

2. find the gcf of 32, 48, and 64.

3. find the gcf of 36,48, and 30.

4. gcf of 28, 56, and 42.

5. 80, 110, 90.

6, last one, 9, 25 and 49

for everyone who gave me the correct answer thx! have a great night =)

Answer 1

1. 12
2. 16
3. 6
4. 14
5. 10
6. 1

Answer 2

1. F(60) = {1, 2, 3, 4, 5, 6, 10, 12,15, 20, 30, 60}
F(72) = {1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72}
F(36) = {1, 2, 3, 4, 6, 9, 12, 18, 36}
GCF(60, 72, 36) = {12}

You can now do 2, 3, 4, 5. and get
2. GCF(32, 48, 64) = {16}
3. GCF(36, 48, 30) = {6}
4. GCF(28, 56, 42) = {14}
5. GCF(80, 110, 90) = {10}

6. F(9) = {1, 3, 9}
F(25) = {1, 5, 25}
F(49) = {1, 7, 49}
GCF(9, 25, 49) = {1}

Answer 3

1.
60,72,36
GCF:12

2.
32,48,64
GCF:16

3.
36,48,30
GCF:6

4.
28,56,42
GCF:14

5.
80,110,90
GCF:10

6.
9,25,49
GCF:1