Subtract 20/28 from 42/2
1st number: 21 0/2, 2nd number: 20/28
42/2 - 20/28 is 142/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 28 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 2 × 14 = 28,
42/2 = 42 × 14/2 × 14 = 588/28 - Likewise, for the 2nd fraction, since 28 × 1 = 28,
20/28 = 20 × 1/28 × 1 = 20/28 - Subtract the two like fractions:
588/28 - 20/28 = 588 - 20/28 = 568/28 - After reducing the fraction, the answer is 142/7
- In mixed form: 202/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2-20/28 42/2-40/28 42/4-20/28 42/2-20/56 42/2-60/28 42/6-20/28 42/2-20/84 42/10-20/28 42/14-20/28