Subtract 1/21 from 42/28
1st number: 1 14/28, 2nd number: 1/21
42/28 - 1/21 is 61/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
42/28 = 42 × 3/28 × 3 = 126/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Subtract the two like fractions:
126/84 - 4/84 = 126 - 4/84 = 122/84 - After reducing the fraction, the answer is 61/42
- In mixed form: 119/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/28-1/21 42/28-2/21 42/56-1/21 42/28-1/42 42/28-3/21 42/84-1/21 42/28-1/63 42/28-5/21 42/28-7/21