Compare 21/90 and 4/12
21/90 is smaller than 4/12
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
4/12 = 4 × 15/12 × 15 = 60/180 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 42/180 < 60/180 or 21/90 < 4/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90 and 4/12 21/90 and 8/12 21/90 and 4/24 63/90 and 4/12 21/90 and 4/36 21/90 and 20/12 21/90 and 4/60 21/90 and 28/12 21/90 and 4/84