Subtract 9/21 from 72/9
1st number: 8 0/9, 2nd number: 9/21
72/9 - 9/21 is 53/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
72/9 = 72 × 7/9 × 7 = 504/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
9/21 = 9 × 3/21 × 3 = 27/63 - Subtract the two like fractions:
504/63 - 27/63 = 504 - 27/63 = 477/63 - After reducing the fraction, the answer is 53/7
- In mixed form: 74/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/9-18/21 72/18-9/21 72/9-9/42 72/9-27/21 72/27-9/21 72/9-9/63 72/9-45/21 72/45-9/21 72/9-63/21 72/63-9/21