Subtract 21/30 from 20/75
20/75 - 21/30 is -13/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 30 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 75 × 2 = 150,
20/75 = 20 × 2/75 × 2 = 40/150 - Likewise, for the 2nd fraction, since 30 × 5 = 150,
21/30 = 21 × 5/30 × 5 = 105/150 - Subtract the two like fractions:
40/150 - 105/150 = 40 - 105/150 = -65/150 - After reducing the fraction, the answer is -13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/75-21/30 20/75-42/30 20/75-21/60 60/75-21/30 20/75-63/30 20/75-21/90