Subtract 8/9 from 75/21
1st number: 3 12/21, 2nd number: 8/9
75/21 - 8/9 is 169/63.
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,
75/21 = 75 × 3/21 × 3 = 225/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
8/9 = 8 × 7/9 × 7 = 56/63 - Subtract the two like fractions:
225/63 - 56/63 = 225 - 56/63 = 169/63 - In mixed form: 243/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/21-16/9 75/42-8/9 75/21-8/18 75/21-24/9 75/63-8/9 75/21-8/27 75/21-40/9 75/21-8/45 75/21-56/9 75/21-8/63