Subtract 6/9 from 72/21
1st number: 3 9/21, 2nd number: 6/9
72/21 - 6/9 is 58/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
72/21 = 72 × 3/21 × 3 = 216/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
6/9 = 6 × 7/9 × 7 = 42/63 - Subtract the two like fractions:
216/63 - 42/63 = 216 - 42/63 = 174/63 - After reducing the fraction, the answer is 58/21
- In mixed form: 216/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21-12/9 72/42-6/9 72/21-6/18 72/21-18/9 72/63-6/9 72/21-6/27 72/21-30/9 72/21-6/45 72/21-42/9 72/21-6/63