Subtract 28/40 from 20/35
20/35 - 28/40 is -9/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 35 × 8 = 280,
20/35 = 20 × 8/35 × 8 = 160/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
28/40 = 28 × 7/40 × 7 = 196/280 - Subtract the two like fractions:
160/280 - 196/280 = 160 - 196/280 = -36/280 - After reducing the fraction, the answer is -9/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/35-28/40 20/35-56/40 20/70-28/40 20/35-28/80 60/35-28/40 20/35-84/40