Subtract 80/8 from 1/21
1st number: 1/21, 2nd number: 10 0/8
1/21 - 80/8 is -209/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
1/21 = 1 × 8/21 × 8 = 8/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
80/8 = 80 × 21/8 × 21 = 1680/168 - Subtract the two like fractions:
8/168 - 1680/168 = 8 - 1680/168 = -1672/168 - After reducing the fraction, the answer is -209/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-80/8 1/42-80/8 1/21-80/16 3/21-80/8 1/63-80/8 1/21-80/24 5/21-80/8 1/21-80/40 7/21-80/8 1/21-80/56