Subtract 28/7 from 42/45
1st number: 42/45, 2nd number: 4 0/7
42/45 - 28/7 is -46/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
42/45 = 42 × 7/45 × 7 = 294/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
28/7 = 28 × 45/7 × 45 = 1260/315 - Subtract the two like fractions:
294/315 - 1260/315 = 294 - 1260/315 = -966/315 - After reducing the fraction, the answer is -46/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-28/7 42/45-56/7 42/90-28/7 42/45-28/14 42/45-84/7 42/45-28/21 42/45-28/35 42/45-28/49