Subtract 10/80 from 21/15
1st number: 1 6/15, 2nd number: 10/80
21/15 - 10/80 is 51/40.
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,
21/15 = 21 × 16/15 × 16 = 336/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
10/80 = 10 × 3/80 × 3 = 30/240 - Subtract the two like fractions:
336/240 - 30/240 = 336 - 30/240 = 306/240 - After reducing the fraction, the answer is 51/40
- In mixed form: 111/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-10/80 21/15-20/80 21/30-10/80 63/15-10/80 21/15-30/80 21/45-10/80 21/15-50/80 21/75-10/80 21/15-70/80