Subtract 20/8 from 21/9
1st number: 2 3/9, 2nd number: 2 4/8
219 - 208 is -16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
219 = 21 × 89 × 8 = 16872 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
208 = 20 × 98 × 9 = 18072 - Subtract the two like fractions:
16872 - 18072 = 168 - 18072 = -1272 - After reducing the fraction, the answer is -16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9-20/8 21/9-40/8 21/18-20/8 21/9-20/16 63/9-20/8 21/9-60/8 21/27-20/8 21/9-20/24 21/45-20/8 21/9-20/40 21/63-20/8 21/9-20/56