Compare 21/40 and 7/12
21/40 is smaller than 7/12
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
7/12 = 7 × 10/12 × 10 = 70/120 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/120 < 70/120 or 21/40 < 7/12
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