Answer:
Explanation:
There are 2 different methods for GCF
1. You can write out all the factors of each number
For question 24. You have 18, 30, and 42 as the number, you would want to arrange them like this:
18: 1, 2, 3, 6, 9, 18
30: 1, 2, 3, 5, 6, 10, 15, 30
42: 1, 2, 3, 6, 7, 14, 21, 42
From that, we can see that 6 is the GCF
2. What I like to do so is to arrange the numbers like this
1. 0 l 18, 30, 42
2. 2 l 9, 15, 21
3. 3 l 1, 1, 1
Now you have to divide the LCM (Lowest Common Factor), which all the numbers have in common, which is 2. Now that the numbers are divided you would want to repeat the same step for the numbers in this question are 9, 15, and 21 and their common LCM is 3. Now that you have reached 1 you now have to multiply the numbers on the side excluding 0. Your answer will be 6.
Note: For this method, if the numbers don't have a common LCM, then stop and multiply the side numbers.
Use this method for the rest of the questions.