Compare 21/30 and 3/18
21/30 is greater than 3/18
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
3/18 = 3 × 5/18 × 5 = 15/90 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/90 > 15/90 or 21/30 > 3/18
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