Subtract 63/20 from 21/18
1st number: 1 3/18, 2nd number: 3 3/20
21/18 - 63/20 is -119/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
21/18 = 21 × 10/18 × 10 = 210/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
63/20 = 63 × 9/20 × 9 = 567/180 - Subtract the two like fractions:
210/180 - 567/180 = 210 - 567/180 = -357/180 - After reducing the fraction, the answer is -119/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-63/20 21/36-63/20 21/18-63/40 63/18-63/20 21/54-63/20 21/18-63/60 21/90-63/20