which one????

Thanks, Yura_chan.....here's another method that doesn't involve common denominators at all  !!!

7 / 10        9 /14      

Cross-multiply the 14 and 7 and put the result  on the left......then......do the same with the 10 and 9 and put the result on the right......so we have

14*7        10*9

98            90

Since the number on the left is larger than the number on the right......the original fraction on the left [7/10]  is larger than the origiinal fraction on the right [ 9/14]  !!!

7/10 is bigger.

To reach this answer you take a common denominator by multiplying the given denominators with the opposite numerators.

7(14)= 98
9(10)=90

Thus 98 > 90.

7/10