Subtract 21/90 from 5/12
5/12 - 21/90 is 11/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
5/12 = 5 × 15/12 × 15 = 75/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Subtract the two like fractions:
75/180 - 42/180 = 75 - 42/180 = 33/180 - After reducing the fraction, the answer is 11/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/12-21/90 5/12-42/90 5/24-21/90 15/12-21/90 5/12-63/90 5/36-21/90 25/12-21/90 5/60-21/90 35/12-21/90 5/84-21/90