Subtract 28/9 from 42/8
1st number: 5 2/8, 2nd number: 3 1/9
42/8 - 28/9 is 77/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 9 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
42/8 = 42 × 9/8 × 9 = 378/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
28/9 = 28 × 8/9 × 8 = 224/72 - Subtract the two like fractions:
378/72 - 224/72 = 378 - 224/72 = 154/72 - After reducing the fraction, the answer is 77/36
- In mixed form: 25/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8-28/9 42/8-56/9 42/16-28/9 42/8-28/18 42/8-84/9 42/24-28/9 42/8-28/27 42/40-28/9 42/8-28/45 42/56-28/9 42/8-28/63