Subtract 25/81 from 5/20
5/20 - 25/81 is -19/324.
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,
5/20 = 5 × 81/20 × 81 = 405/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
25/81 = 25 × 20/81 × 20 = 500/1620 - Subtract the two like fractions:
405/1620 - 500/1620 = 405 - 500/1620 = -95/1620 - After reducing the fraction, the answer is -19/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-25/81 5/20-50/81 5/40-25/81 15/20-25/81 5/20-75/81 5/60-25/81 25/20-25/81 35/20-25/81