Subtract 21/30 from 5/20
5/20 - 21/30 is -9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
5/20 = 5 × 3/20 × 3 = 15/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
21/30 = 21 × 2/30 × 2 = 42/60 - Subtract the two like fractions:
15/60 - 42/60 = 15 - 42/60 = -27/60 - After reducing the fraction, the answer is -9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-21/30 5/20-42/30 5/40-21/30 5/20-21/60 15/20-21/30 5/20-63/30 5/60-21/30 5/20-21/90 25/20-21/30 35/20-21/30