Subtract 21/50 from 20/30
20/30 - 21/50 is 37/150.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 50 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 30 × 5 = 150,
20/30 = 20 × 5/30 × 5 = 100/150 - Likewise, for the 2nd fraction, since 50 × 3 = 150,
21/50 = 21 × 3/50 × 3 = 63/150 - Subtract the two like fractions:
100/150 - 63/150 = 100 - 63/150 = 37/150
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-21/50 20/30-42/50 20/60-21/50 60/30-21/50 20/30-63/50 20/90-21/50