Compare 21/15 and 18/20
1st number: 1 6/15, 2nd number: 18/20
21/15 is greater than 18/20
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
21/15 = 21 × 4/15 × 4 = 84/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
18/20 = 18 × 3/20 × 3 = 54/60 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 84/60 > 54/60 or 21/15 > 18/20
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