Subtract 20/28 from 42/27
1st number: 1 15/27, 2nd number: 20/28
42/27 - 20/28 is 53/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 28 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 27 × 28 = 756,
42/27 = 42 × 28/27 × 28 = 1176/756 - Likewise, for the 2nd fraction, since 28 × 27 = 756,
20/28 = 20 × 27/28 × 27 = 540/756 - Subtract the two like fractions:
1176/756 - 540/756 = 1176 - 540/756 = 636/756 - After reducing the fraction, the answer is 53/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/27-20/28 42/27-40/28 42/54-20/28 42/27-20/56 42/27-60/28 42/81-20/28 42/27-20/84