18 can be divided by 3
18 can be divided by 9
45 can be divided by 9
45 can be divided by 3
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The GCF of both numbers is 1
The LCM always be the largest of the given numbers or a multiple of the largest number. The largest number given is 45, but 18 will not divide evenly into 45. The next multiple of 45 is 90 (2 x 45). Since 90 is divisible by both 5 and 18, then 90 is the LCM.
45 over 18 as a mixed number = 21/2
45/18 = 21/2
2 goes into both numbers 4 and 90 because 2 x 2 = 4 and 2 x 45 = 90.