Subtract 30/8 from 15/5
1st number: 3 0/5, 2nd number: 3 6/8
15/5 - 30/8 is -3/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
15/5 = 15 × 8/5 × 8 = 120/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
30/8 = 30 × 5/8 × 5 = 150/40 - Subtract the two like fractions:
120/40 - 150/40 = 120 - 150/40 = -30/40 - After reducing the fraction, the answer is -3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/5-30/8 15/5-60/8 15/10-30/8 15/5-30/16 45/5-30/8 15/5-90/8 15/5-30/24 75/5-30/8 15/25-30/8 15/5-30/40 15/35-30/8 15/5-30/56