Subtract 80/21 from 5/4
1st number: 1 1/4, 2nd number: 3 17/21
5/4 - 80/21 is -215/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
5/4 = 5 × 21/4 × 21 = 105/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
80/21 = 80 × 4/21 × 4 = 320/84 - Subtract the two like fractions:
105/84 - 320/84 = 105 - 320/84 = -215/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/4-80/21 5/8-80/21 5/4-80/42 15/4-80/21 5/12-80/21 5/4-80/63 25/4-80/21 5/20-80/21 35/4-80/21 5/28-80/21