Subtract 8/20 from 15/70
15/70 - 8/20 is -13/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
15/70 = 15 × 2/70 × 2 = 30/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
8/20 = 8 × 7/20 × 7 = 56/140 - Subtract the two like fractions:
30/140 - 56/140 = 30 - 56/140 = -26/140 - After reducing the fraction, the answer is -13/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70-8/20 15/70-16/20 15/70-8/40 45/70-8/20 15/70-24/20 15/70-8/60 75/70-8/20 15/70-40/20 15/70-56/20