Question

Can some one do these two i will put 20 pts

What is the GCF of 8 and 32?

2
4
8
32

What is the LCM of 20 and 40?

5
10
20
40

Answer 1

gcf = 8 lcm= 5

gcf means greatest common facter. 8 goes into 8 1 time and 32 4 times. therefor 8 is the gcf. lcm means least common multiple. and 5 is the lowest number that goes into 20 and 40

Answer 2

For the first question, the right answer is 8.

for the second question, the right answer is 40

Explanation:

First of all, we need to find the GCF of 8 and 32, for that we need to find the factors of 8 and 32

Factors of 8 are:

8=1, 2, 4, 8.

Factors of 32 are=

32= 1, 2, 4, 8, 16, 32

we can see that 1, 2, 4 and 8 are factors for the two numbers, but 8 is the greatest of these numbers, so the greatest common factor for 8 and 40 is 8.

Now we just need to find the LCM of 20 and 40 we need to find their multiples

Multiples of 20=

20: 20, 40, 60, 80, 100, 120

Multiples of 40=

40: 40,80, 120, 160, 200

We can see that 40, 80 and 120 are common multiples but the lowest one is the LCM

So the LCM of 20 and 40 is 40