Subtract 20/7 from 42/28
1st number: 1 14/28, 2nd number: 2 6/7
42/28 - 20/7 is -19/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
42/28 = 42 × 1/28 × 1 = 42/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
20/7 = 20 × 4/7 × 4 = 80/28 - Subtract the two like fractions:
42/28 - 80/28 = 42 - 80/28 = -38/28 - After reducing the fraction, the answer is -19/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/28-20/7 42/28-40/7 42/56-20/7 42/28-20/14 42/28-60/7 42/84-20/7 42/28-20/21 42/28-20/35 42/28-20/49