Compare 12/21 and 25/40
12/21 is smaller than 25/40
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
12/21 = 12 × 40/21 × 40 = 480/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
25/40 = 25 × 21/40 × 21 = 525/840 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 480/840 < 525/840 or 12/21 < 25/40
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