Subtract 21/9 from 8/20
1st number: 8/20, 2nd number: 2 3/9
8/20 - 21/9 is -29/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
8/20 = 8 × 9/20 × 9 = 72/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
21/9 = 21 × 20/9 × 20 = 420/180 - Subtract the two like fractions:
72/180 - 420/180 = 72 - 420/180 = -348/180 - After reducing the fraction, the answer is -29/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20-21/9 8/20-42/9 8/40-21/9 8/20-21/18 24/20-21/9 8/20-63/9 8/60-21/9 8/20-21/27 40/20-21/9 8/20-21/45 56/20-21/9 8/20-21/63