Subtract 21/7 from 15/24
1st number: 15/24, 2nd number: 3 0/7
15/24 - 21/7 is -19/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 7 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
15/24 = 15 × 7/24 × 7 = 105/168 - Likewise, for the 2nd fraction, since 7 × 24 = 168,
21/7 = 21 × 24/7 × 24 = 504/168 - Subtract the two like fractions:
105/168 - 504/168 = 105 - 504/168 = -399/168 - After reducing the fraction, the answer is -19/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/24-21/7 15/24-42/7 15/48-21/7 15/24-21/14 45/24-21/7 15/24-63/7 15/72-21/7 75/24-21/7 15/24-21/35 15/24-21/49