Subtract 21/6 from 81/20
1st number: 4 1/20, 2nd number: 3 3/6
81/20 - 21/6 is 11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 6 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
81/20 = 81 × 3/20 × 3 = 243/60 - Likewise, for the 2nd fraction, since 6 × 10 = 60,
21/6 = 21 × 10/6 × 10 = 210/60 - Subtract the two like fractions:
243/60 - 210/60 = 243 - 210/60 = 33/60 - After reducing the fraction, the answer is 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20-42/6 81/40-21/6 81/20-21/12 81/20-63/6 81/60-21/6 81/20-21/18 81/20-21/30 81/20-21/42