Subtract 8/10 from 20/40
20/40 - 8/10 is -3/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 10 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
20/40 = 20 × 1/40 × 1 = 20/40 - Likewise, for the 2nd fraction, since 10 × 4 = 40,
8/10 = 8 × 4/10 × 4 = 32/40 - Subtract the two like fractions:
20/40 - 32/40 = 20 - 32/40 = -12/40 - After reducing the fraction, the answer is -3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-16/10 20/80-8/10 20/40-8/20 60/40-8/10 20/40-24/10 20/40-8/30 20/40-40/10 20/40-8/50 20/40-56/10 20/40-8/70