Compare 3/42 and 35/80, Which fraction is greater?

Compare 3/42 and 35/80

3/42 is smaller than 35/80

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 42 × 40 = 1680,
3/42 = 3 × 40/42 × 40 = 120/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
35/80 = 35 × 21/80 × 21 = 735/1680
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
120/1680 < 735/1680 or 3/42 < 35/80

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