Subtract 30/35 from 15/20
15/20 - 30/35 is -3/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 35 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 35 × 4 = 140,
30/35 = 30 × 4/35 × 4 = 120/140 - Subtract the two like fractions:
105/140 - 120/140 = 105 - 120/140 = -15/140 - After reducing the fraction, the answer is -3/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-30/35 15/20-60/35 15/40-30/35 15/20-30/70 45/20-30/35 15/20-90/35 15/60-30/35 75/20-30/35