Subtract 21/6 from 15/80
1st number: 15/80, 2nd number: 3 3/6
15/80 - 21/6 is -53/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 6 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
15/80 = 15 × 3/80 × 3 = 45/240 - Likewise, for the 2nd fraction, since 6 × 40 = 240,
21/6 = 21 × 40/6 × 40 = 840/240 - Subtract the two like fractions:
45/240 - 840/240 = 45 - 840/240 = -795/240 - After reducing the fraction, the answer is -53/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/80-21/6 15/80-42/6 15/80-21/12 45/80-21/6 15/80-63/6 15/80-21/18 75/80-21/6 15/80-21/30 15/80-21/42