Subtract 21/7 from 72/6
1st number: 12 0/6, 2nd number: 3 0/7
72/6 - 21/7 is 9/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
72/6 = 72 × 7/6 × 7 = 504/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
21/7 = 21 × 6/7 × 6 = 126/42 - Subtract the two like fractions:
504/42 - 126/42 = 504 - 126/42 = 378/42 - After reducing the fraction, the answer is 9/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/6-42/7 72/12-21/7 72/6-21/14 72/6-63/7 72/18-21/7 72/30-21/7 72/6-21/35 72/42-21/7 72/6-21/49