Subtract 10/30 from 21/8
1st number: 2 5/8, 2nd number: 10/30
21/8 - 10/30 is 55/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
21/8 = 21 × 15/8 × 15 = 315/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
10/30 = 10 × 4/30 × 4 = 40/120 - Subtract the two like fractions:
315/120 - 40/120 = 315 - 40/120 = 275/120 - After reducing the fraction, the answer is 55/24
- In mixed form: 27/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-10/30 21/8-20/30 21/16-10/30 21/8-10/60 63/8-10/30 21/24-10/30 21/8-10/90 21/8-50/30 21/40-10/30 21/8-70/30 21/56-10/30