Which fraction is the greatest 3 twelves or 5 eights?

Answer 1

The LCM of 12 and 8 is 24.

3/12 = 6/24

5/8 = 15/24

So clearly, the second fraction is much larger.

Another way to check is to put them side by side, and cross multiply upwards, then compare products.

3...........5

--..........--

12.........8

Cross multiplying the 8 and the 3 gives 24, and put that above the 3

Cross multiplying the 12 and the 5 gives 60, and put that above the 5

since 24<60, the first fraction is less.