Subtract 40/81 from 27/20
1st number: 1 7/20, 2nd number: 40/81
27/20 - 40/81 is 1387/1620.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
27/20 = 27 × 81/20 × 81 = 2187/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
40/81 = 40 × 20/81 × 20 = 800/1620 - Subtract the two like fractions:
2187/1620 - 800/1620 = 2187 - 800/1620 = 1387/1620
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/20-40/81 27/20-80/81 27/40-40/81 81/20-40/81 27/60-40/81