Subtract 2/28 from 30/21
1st number: 1 9/21, 2nd number: 2/28
30/21 - 2/28 is 19/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
30/21 = 30 × 4/21 × 4 = 120/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
2/28 = 2 × 3/28 × 3 = 6/84 - Subtract the two like fractions:
120/84 - 6/84 = 120 - 6/84 = 114/84 - After reducing the fraction, the answer is 19/14
- In mixed form: 15/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-2/28 30/21-4/28 30/42-2/28 30/21-2/56 90/21-2/28 30/21-6/28 30/63-2/28 30/21-2/84 30/21-10/28 30/21-14/28