Questions:
#1: Common multiples help you if you with questions that contains having to find out the common multiple of something. A common multiple is a multiple that both numbers have as one of their multiple. For example, if I had the number 6 and 9, the common multiple of 6 and 9 would be 3. But common factors help you with questions that include with finding the common factors. One example would be if there was a ferris wheel that goes for 3 seconds per round while another goes for 4 seconds. And they asked you what's the fastest time they can meet, then you would keep on adding 4+4 or 3+3 until you get a number that matches. In this case, the answer would be 12.
#2a: You can find the common factors by adding up 4+4 or 3+3 if I had a question like that ferris wheel. You keep on adding it until you spot a number that they have in common. Like 12. 12 is not the greatest common factor because you can keep on adding it up until you get 100 or more!
#2b: It sometimes provide the answer for you depending on the question. Because if the question is asking you to look for the greatest common factor, then you already know your answer.
#3a: You can find the common multiple by adding up the multiples by itself over and over again until you get a number that both numbers have. You can find the least common multiple by doing the same thing, except it's the first number you get that they have in common.
#3b: The least common multiple can also provide you the answer because if it was like the ferris wheel problem, you would need to keep on adding it over and over again until you get the seconds/time of when they meet.
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