# Can someone check this for me :

Find the gcf for each of the following groups of numbers: 36,64, and 180

Find the lcm for each of the following groups of numbers which ever method you wish:8,15, and 20

Find two factors of 15 with a difference of 2?

Normally, we exclude 1 when listing lcm. In this case, it is wrong. The lcm is 120.

my question is are the other two answers correct or are they wrong as well.

4 years ago

7 months ago

## Let's go through the answers one by one and determine if they are correct or incorrect.

1. Find the greatest common factor (GCF) for the numbers 36, 64, and 180.
To check if this is correct, we need to find the factors of each number and see if there is a common factor among them.
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
Factors of 64: 1, 2, 4, 8, 16, 32, 64
Factors of 180: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180
By comparing these lists, we can see that the largest common factor among them is indeed 4. Therefore, your answer is correct.

2. Find the least common multiple (LCM) for the numbers 8, 15, and 20.
To check if this is correct, we need to find the multiples of each number and see if there is a common multiple among them.
Multiples of 8: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, ...
Multiples of 15: 15, 30, 45, 60, 75, 90, 105, ...
Multiples of 20: 20, 40, 60, 80, 100, 120, ...
By comparing these lists, we can see that the smallest common multiple among them is 120. Therefore, your answer of LCM = 1 is incorrect.

3. Find two factors of 15 with a difference of 2.