Subtract 18/8 from 80/21
1st number: 3 17/21, 2nd number: 2 2/8
80/21 - 18/8 is 131/84.
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,
80/21 = 80 × 8/21 × 8 = 640/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168 - Subtract the two like fractions:
640/168 - 378/168 = 640 - 378/168 = 262/168 - After reducing the fraction, the answer is 131/84
- In mixed form: 147/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-36/8 80/42-18/8 80/21-18/16 80/21-54/8 80/63-18/8 80/21-18/24 80/21-90/8 80/21-18/40 80/21-18/56