Question

Which pair of numbers have a GCF of 3?

Choose all answers that are correct.


A.
18 and 15

B.
3 and 9

C.
6 and 9

D.
15 and 20

Answer 1

Greatest common factor is the biggest multiple, so what do you think it is?

Answer 2

idk

Answer 3

Factors of 18:
1, 2, 3, 6, 9, 18
Factors of 15:
1, 2, 5, 15
The greatest factor both 18 and 15 have is 3.

Now do the same for the other choices.

Answer 4

The GCF is the greatest common FACTOR, not multiple.

Answer 5

d

Answer 6

A

Answer 7

Oops my bad, his explanation is correct :) make you follow those steps.

Answer 8

so the answer is d,a

Answer 9

wat the third one

Answer 10

wat is the answer

Answer 11

Look at B and C, follow the same steps as math explained o:

Answer 12

For B; List all of the factors of 15 and 18, and find the largest factor that they both have.
For D; Can 15 and 20 both be divisible by 3?

Answer 13

soo wat the answer d,a

Answer 14

D is not an answer.
The GCF of D is 5, not 3.

Answer 15

oh

Answer 16

A is part of the answer.

Now check B.
What are the factors of 3 and what are the factors of 9?

Answer 17

b,c

Answer 18

We can't give you the answers, just the tools to help you!

Answer 19

ok

Answer 20

B:
Factors of 3: 1, 3
Factors of 9: 1, 3, 9

C:
Factors of 6: 1, 2, 3, 6
Factors of 9: 1, 3, 9

Now look above for B and C.
What is the largest factor in common for B and for C?

Answer 21

3,6,9,12,15,18

Answer 22

What is that?

Answer 23

9

Answer 24

\(\sf Choice ~ B:\)
\(\sf Factors ~of ~3: 1, \color{red} 3\)
\(\sf Factors ~of ~9: 1, \color{red} {3}, 9\)

Answer 25

When you find the greatest common factor for two numbers, you lost the numbers they have in common. For question C,

The only factors of 6 is 1, 2, 3, 6
The only factors of 9 is 1, 3, 9

Now they each have two numbers in common. 1, and 3. Now decide which of the factors is larger. That is your greatest common factor.

Answer 26

3

Answer 27

Find not lost, open study is glitchy on iPhone

Answer 28

oh

Answer 29

Yes, you are correct. B and C are answers. Since we already had A, then
the answer is A, B, C

Answer 30

It's a really easy unit of math once you get the hang of it.