Subtract 2/15 from 21/80
21/80 - 2/15 is 31/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 15 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
21/80 = 21 × 3/80 × 3 = 63/240 - Likewise, for the 2nd fraction, since 15 × 16 = 240,
2/15 = 2 × 16/15 × 16 = 32/240 - Subtract the two like fractions:
63/240 - 32/240 = 63 - 32/240 = 31/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80-2/15 21/80-4/15 21/80-2/30 63/80-2/15 21/80-6/15 21/80-2/45 21/80-10/15 21/80-2/75 21/80-14/15