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luv2help
If you cannot find a common denominator on the top of your head, you can multiply the two denominators of the fractions together and then you will end up with a number that has a common denominator...

xcarrow1234
1. The least common denominator of 8 and 12 is 24. 8x3=24 so you would multiply 5 by 3 as well. Since 12x2=24 multiply the 9 by 2.

2. Least common denominator is 30. Multiply the first fraction by 5 and the second one by 2

3. Least common denominator is 42. First fraction is multiplied by 7, and the second one is multiplied by 3.

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