Subtract 42/9 from 28/7
1st number: 4 0/7, 2nd number: 4 6/9
28/7 - 42/9 is -2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
28/7 = 28 × 9/7 × 9 = 252/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Subtract the two like fractions:
252/63 - 294/63 = 252 - 294/63 = -42/63 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7-42/9 28/7-84/9 28/14-42/9 28/7-42/18 84/7-42/9 28/21-42/9 28/7-42/27 28/35-42/9 28/7-42/45 28/49-42/9 28/7-42/63