Subtract 42/56 from 28/45
28/45 - 42/56 is -23/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 56 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 45 × 56 = 2520,
28/45 = 28 × 56/45 × 56 = 1568/2520 - Likewise, for the 2nd fraction, since 56 × 45 = 2520,
42/56 = 42 × 45/56 × 45 = 1890/2520 - Subtract the two like fractions:
1568/2520 - 1890/2520 = 1568 - 1890/2520 = -322/2520 - After reducing the fraction, the answer is -23/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/45-42/56 28/45-84/56 28/90-42/56 84/45-42/56