Subtract 21/10 from 30/75
1st number: 30/75, 2nd number: 2 1/10
30/75 - 21/10 is -17/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 10 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 75 × 2 = 150,
30/75 = 30 × 2/75 × 2 = 60/150 - Likewise, for the 2nd fraction, since 10 × 15 = 150,
21/10 = 21 × 15/10 × 15 = 315/150 - Subtract the two like fractions:
60/150 - 315/150 = 60 - 315/150 = -255/150 - After reducing the fraction, the answer is -17/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/75-21/10 30/75-42/10 30/75-21/20 90/75-21/10 30/75-63/10 30/75-21/30 30/75-21/50 30/75-21/70