Subtract 48/42 from 28/21
1st number: 1 7/21, 2nd number: 1 6/42
28/21 - 48/42 is 4/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
28/21 = 28 × 2/21 × 2 = 56/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
48/42 = 48 × 1/42 × 1 = 48/42 - Subtract the two like fractions:
56/42 - 48/42 = 56 - 48/42 = 8/42 - After reducing the fraction, the answer is 4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-48/42 28/21-96/42 28/42-48/42 28/21-48/84 84/21-48/42 28/63-48/42