Compare 21/28 and 12/42
21/28 is greater than 12/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
21/28 = 21 × 3/28 × 3 = 63/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
12/42 = 12 × 2/42 × 2 = 24/84 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/84 > 24/84 or 21/28 > 12/42
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