Compare 1/81 and 4/21
1/81 is smaller than 4/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 21 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
1/81 = 1 × 7/81 × 7 = 7/567 - Likewise, for the 2nd fraction, since 21 × 27 = 567,
4/21 = 4 × 27/21 × 27 = 108/567 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 7/567 < 108/567 or 1/81 < 4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/81 and 4/21 1/81 and 8/21 1/81 and 4/42 3/81 and 4/21 1/81 and 12/21 1/81 and 4/63 5/81 and 4/21 1/81 and 20/21 7/81 and 4/21 1/81 and 28/21