Compare 1/21 and 18/25
1/21 is smaller than 18/25
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
1/21 = 1 × 25/21 × 25 = 25/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
18/25 = 18 × 21/25 × 21 = 378/525 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 25/525 < 378/525 or 1/21 < 18/25
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