my teacher wants me to find 3 common multiples for each pair, for example 15 over 30
the common multiples are 3,5,and 1
If 1 is a common multiple, so is 15. Since 1 is always a common multiple for any number, I don't think that is what your teacher is seeking.
I hope this helps a little more. Thanks for asking.
To find common multiples, you need to find the numbers that are divisible by both values in the pair. Here's how you can find three common multiples for the pair 15 and 30:
Step 1: List the multiples of each number individually.
Multiples of 15: 15, 30, 45, 60, 75, 90, ...
Multiples of 30: 30, 60, 90, 120, 150, 180, ...
Step 2: Identify the common multiples.
From the lists above, we can see that the common multiples of 15 and 30 are: 30, 60, and 90.
So, the three common multiples for the pair 15 and 30 are 30, 60, and 90.