Subtract 15/21 from 72/6
1st number: 12 0/6, 2nd number: 15/21
72/6 - 15/21 is 79/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 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 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Subtract the two like fractions:
504/42 - 30/42 = 504 - 30/42 = 474/42 - After reducing the fraction, the answer is 79/7
- In mixed form: 112/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/6-30/21 72/12-15/21 72/6-15/42 72/6-45/21 72/18-15/21 72/6-15/63 72/6-75/21 72/30-15/21 72/42-15/21