Compare 30/70 and 63/81, Which fraction is greater?

Compare 30/70 and 63/81

30/70 is smaller than 63/81

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 81 is 5670

Next, find the equivalent fraction of both fractional numbers with denominator 5670
For the 1st fraction, since 70 × 81 = 5670,
30/70 = 30 × 81/70 × 81 = 2430/5670
Likewise, for the 2nd fraction, since 81 × 70 = 5670,
63/81 = 63 × 70/81 × 70 = 4410/5670
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
2430/5670 < 4410/5670 or 30/70 < 63/81

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