Subtract 8/14 from 21/72
21/72 - 8/14 is -47/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 14 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Likewise, for the 2nd fraction, since 14 × 36 = 504,
8/14 = 8 × 36/14 × 36 = 288/504 - Subtract the two like fractions:
147/504 - 288/504 = 147 - 288/504 = -141/504 - After reducing the fraction, the answer is -47/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72-8/14 21/72-16/14 21/72-8/28 63/72-8/14 21/72-24/14 21/72-8/42 21/72-40/14 21/72-8/70 21/72-56/14 21/72-8/98