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The LCD of 12 and 18 is 1. Because 12 can be written as 12/1 and 18 can be written as 18/1. Therefore the answer is 1.

Hope this helps =)
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A multiple of a number is a whole number times that number. For example, some multiples of 6 are

6, 12, 18, 24, 30, and 36

If two numbers are given then a common multiple of the two numbers is a number that is a multiple of both. Of all the common multiples of two numbers, there is a smallest one which we call the least common multiple.
LCD stands for least common denominator
The LCD of the denominator 12 and 18 is 6.
Here is the solution:
12 can be divided by 6,the quotient will be 2
18 can be divided by 6,the quotient will be 3..
that's it,i wish i could help! :)
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