Subtract 8/9 from 16/21
16/21 - 8/9 is -8/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
16/21 = 16 × 3/21 × 3 = 48/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
8/9 = 8 × 7/9 × 7 = 56/63 - Subtract the two like fractions:
48/63 - 56/63 = 48 - 56/63 = -8/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-8/9 16/21-16/9 16/42-8/9 16/21-8/18 48/21-8/9 16/21-24/9 16/63-8/9 16/21-8/27 80/21-8/9 16/21-40/9 16/21-8/45 16/21-56/9 16/21-8/63