Compare 18/81 and 12/20
18/81 is smaller than 12/20
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
18/81 = 18 × 20/81 × 20 = 360/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
12/20 = 12 × 81/20 × 81 = 972/1620 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 360/1620 < 972/1620 or 18/81 < 12/20
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