Compare 18/21 and 8/15
18/21 is greater than 8/15
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
18/21 = 18 × 5/21 × 5 = 90/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
8/15 = 8 × 7/15 × 7 = 56/105 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 90/105 > 56/105 or 18/21 > 8/15
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