Subtract 21/3 from 21/20
1st number: 1 1/20, 2nd number: 7 0/3
21/20 - 21/3 is -119/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 3 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Likewise, for the 2nd fraction, since 3 × 20 = 60,
21/3 = 21 × 20/3 × 20 = 420/60 - Subtract the two like fractions:
63/60 - 420/60 = 63 - 420/60 = -357/60 - After reducing the fraction, the answer is -119/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-21/3 21/20-42/3 21/40-21/3 21/20-21/6 63/20-21/3 21/20-63/3 21/60-21/3 21/20-21/9 21/20-21/15