Subtract 63/21 from 8/9
1st number: 8/9, 2nd number: 3 0/21
8/9 - 63/21 is -19/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
8/9 = 8 × 7/9 × 7 = 56/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
63/21 = 63 × 3/21 × 3 = 189/63 - Subtract the two like fractions:
56/63 - 189/63 = 56 - 189/63 = -133/63 - After reducing the fraction, the answer is -19/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/9-63/21 8/18-63/21 8/9-63/42 24/9-63/21 8/27-63/21 40/9-63/21 8/45-63/21 56/9-63/21 8/63-63/21