Compare 15/8 and 21/42
1st number: 1 7/8, 2nd number: 21/42
15/8 is greater than 21/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
15/8 = 15 × 21/8 × 21 = 315/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
21/42 = 21 × 4/42 × 4 = 84/168 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 315/168 > 84/168 or 15/8 > 21/42
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