Subtract 21/80 from 45/15
1st number: 3 0/15, 2nd number: 21/80
45/15 - 21/80 is 219/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
45/15 = 45 × 16/15 × 16 = 720/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
21/80 = 21 × 3/80 × 3 = 63/240 - Subtract the two like fractions:
720/240 - 63/240 = 720 - 63/240 = 657/240 - After reducing the fraction, the answer is 219/80
- In mixed form: 259/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15-21/80 45/15-42/80 45/30-21/80 45/15-63/80 45/75-21/80