Subtract 84/28 from 15/20
1st number: 15/20, 2nd number: 3 0/28
15/20 - 84/28 is -9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
15/20 = 15 × 7/20 × 7 = 105/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
84/28 = 84 × 5/28 × 5 = 420/140 - Subtract the two like fractions:
105/140 - 420/140 = 105 - 420/140 = -315/140 - After reducing the fraction, the answer is -9/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-84/28 15/40-84/28 15/20-84/56 45/20-84/28 15/60-84/28 75/20-84/28