Subtract 28/8 from 10/84
1st number: 10/84, 2nd number: 3 4/8
10/84 - 28/8 is -71/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
10/84 = 10 × 2/84 × 2 = 20/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
28/8 = 28 × 21/8 × 21 = 588/168 - Subtract the two like fractions:
20/168 - 588/168 = 20 - 588/168 = -568/168 - After reducing the fraction, the answer is -71/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/84-28/8 10/84-56/8 10/84-28/16 30/84-28/8 10/84-84/8 10/84-28/24 50/84-28/8 10/84-28/40 70/84-28/8 10/84-28/56