Subtract 64/21 from 8/18
1st number: 8/18, 2nd number: 3 1/21
8/18 - 64/21 is -164/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
8/18 = 8 × 7/18 × 7 = 56/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
64/21 = 64 × 6/21 × 6 = 384/126 - Subtract the two like fractions:
56/126 - 384/126 = 56 - 384/126 = -328/126 - After reducing the fraction, the answer is -164/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18-64/21 8/36-64/21 8/18-64/42 24/18-64/21 8/54-64/21 8/18-64/63 40/18-64/21 8/90-64/21 56/18-64/21