Compare 3/80 and 20/21
3/80 is smaller than 20/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
3/80 = 3 × 21/80 × 21 = 63/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
20/21 = 20 × 80/21 × 80 = 1600/1680 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/1680 < 1600/1680 or 3/80 < 20/21
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