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The simplest way to answer this would be to multply them together:
5 x 9 = 45 which is your answer, although in some cases this wouldn't work, so the foolproof way of solving this would be to list all the multiples of each and find a common multiple:
i.e.
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99
Doing it this way you notice that there are actually 2 common multiples of 5 and 9 under 100.
It's also interesting to note that 45 is also a multiple of 90 and so on if you continued the list, all the common multiples would be a multiple of 45 (which is the lowest common multiple)
What else can I help you with?
Only common multiple of 7 and 9 under 100?
63
What is the only common multiple of 7 and 9 under 100?
sixty-three
What are the common multiples of 9 and 10 under 100?
there is only one, 90
What are common multiples of 20 and 25 from 1 to 100?
The only common multiple in the given range is 100.The only common multiple in the specified range is 100.
What are the common factors of 9 and 100?
The only common factor is: 1
What are the common multiples of 60 42 up to 100?
60 and 42 have no common multiples under 100.
What are the LCM common multiples for 20 AND 25 between the 1 and 100?
The only common multiple in that range is 100.
What are the common factors of 43 and 100?
The only common factor of 43 and 100 is 1.
What is a common factor of 100 and 99?
The only common factor is: 1
What are the greatest common factors of 100 and 24?
the greatest common factor is 4. 2 and 4 are the only common factors of 100 and 24.
What can go into 57 and 100?
1 is the only common factor of 57 and 100.
What is the common multiple of 7 and 9 under 100?
63, sigh....
