Subtract 28/21 from 10/35
1st number: 10/35, 2nd number: 1 7/21
10/35 - 28/21 is -22/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
10/35 = 10 × 3/35 × 3 = 30/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
28/21 = 28 × 5/21 × 5 = 140/105 - Subtract the two like fractions:
30/105 - 140/105 = 30 - 140/105 = -110/105 - After reducing the fraction, the answer is -22/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/35-28/21 10/35-56/21 10/70-28/21 10/35-28/42 30/35-28/21 10/35-84/21 10/35-28/63 50/35-28/21 70/35-28/21