Subtract 45/40 from 20/70
1st number: 20/70, 2nd number: 1 5/40
20/70 - 45/40 is -47/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
20/70 = 20 × 4/70 × 4 = 80/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
45/40 = 45 × 7/40 × 7 = 315/280 - Subtract the two like fractions:
80/280 - 315/280 = 80 - 315/280 = -235/280 - After reducing the fraction, the answer is -47/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-45/40 20/70-90/40 20/70-45/80 60/70-45/40