Subtract 30/35 from 28/21
1st number: 1 7/21, 2nd number: 30/35
28/21 - 30/35 is 10/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
28/21 = 28 × 5/21 × 5 = 140/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
30/35 = 30 × 3/35 × 3 = 90/105 - Subtract the two like fractions:
140/105 - 90/105 = 140 - 90/105 = 50/105 - After reducing the fraction, the answer is 10/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-30/35 28/21-60/35 28/42-30/35 28/21-30/70 84/21-30/35 28/21-90/35 28/63-30/35