Subtract 20/8 from 15/30
1st number: 15/30, 2nd number: 2 4/8
15/30 - 20/8 is -2/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
15/30 = 15 × 4/30 × 4 = 60/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
20/8 = 20 × 15/8 × 15 = 300/120 - Subtract the two like fractions:
60/120 - 300/120 = 60 - 300/120 = -240/120 - After reducing the fraction, the answer is -2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30-40/8 15/60-20/8 15/30-20/16 45/30-20/8 15/30-60/8 15/90-20/8 15/30-20/24 75/30-20/8 15/30-20/40 15/30-20/56