Subtract 21/8 from 10/30
1st number: 10/30, 2nd number: 2 5/8
10/30 - 21/8 is -55/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
10/30 = 10 × 4/30 × 4 = 40/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
21/8 = 21 × 15/8 × 15 = 315/120 - Subtract the two like fractions:
40/120 - 315/120 = 40 - 315/120 = -275/120 - After reducing the fraction, the answer is -55/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/30-21/8 10/30-42/8 10/60-21/8 10/30-21/16 10/30-63/8 10/90-21/8 10/30-21/24 50/30-21/8 10/30-21/40 70/30-21/8 10/30-21/56