math
posted by Anonymous .
First, why is the least common denominator of 3/4 and 4/8 not the product of 4 ad 8?
Also, why is the least common denominator of 5/9 and 7/12 not the product of 9 and 12.
Please explain both answers.

They are not the least or the smallest common denominators.

Sorry but can you please explain that more.

The least common denominator of 3/4 and 4/8 is 8. It's the smallest number divisible by both 4 and 8.
The least common denominator of 5/9 and 7/12 is 36. It's the smallest number divisible by both 9 and 12. 
Ms. Sue i am very sorry but please explain that with more details.

These sites have excellent explanations.
http://www.mathsisfun.com/leastcommondenominator.html
http://www.youtube.com/watch?v=kZUImLklXHk
http://www.aaamath.com/fra66jx2.htm 
But what do they mean when they say the product of 4 and 8 and of 9 and 12?

Product is the answer to a multiplication problem.
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