Subtract 21/7 from 6/72
1st number: 6/72, 2nd number: 3 0/7
6/72 - 21/7 is -35/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 7 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
6/72 = 6 × 7/72 × 7 = 42/504 - Likewise, for the 2nd fraction, since 7 × 72 = 504,
21/7 = 21 × 72/7 × 72 = 1512/504 - Subtract the two like fractions:
42/504 - 1512/504 = 42 - 1512/504 = -1470/504 - After reducing the fraction, the answer is -35/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/72-21/7 6/72-42/7 6/72-21/14 18/72-21/7 6/72-63/7 30/72-21/7 6/72-21/35 42/72-21/7 6/72-21/49