Subtract 21/8 from 15/35
1st number: 15/35, 2nd number: 2 5/8
15/35 - 21/8 is -123/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 8 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 35 × 8 = 280,
15/35 = 15 × 8/35 × 8 = 120/280 - Likewise, for the 2nd fraction, since 8 × 35 = 280,
21/8 = 21 × 35/8 × 35 = 735/280 - Subtract the two like fractions:
120/280 - 735/280 = 120 - 735/280 = -615/280 - After reducing the fraction, the answer is -123/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/35-21/8 15/35-42/8 15/70-21/8 15/35-21/16 45/35-21/8 15/35-63/8 15/35-21/24 75/35-21/8 15/35-21/40 15/35-21/56