Subtract 10/30 from 21/75
21/75 - 10/30 is -4/75.
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,
21/75 = 21 × 2/75 × 2 = 42/150 - Likewise, for the 2nd fraction, since 30 × 5 = 150,
10/30 = 10 × 5/30 × 5 = 50/150 - Subtract the two like fractions:
42/150 - 50/150 = 42 - 50/150 = -8/150 - After reducing the fraction, the answer is -4/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-10/30 21/75-20/30 21/75-10/60 63/75-10/30 21/75-10/90 21/75-50/30 21/75-70/30