Subtract 50/18 from 21/8
1st number: 2 5/8, 2nd number: 2 14/18
21/8 - 50/18 is -11/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
21/8 = 21 × 9/8 × 9 = 189/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
50/18 = 50 × 4/18 × 4 = 200/72 - Subtract the two like fractions:
189/72 - 200/72 = 189 - 200/72 = -11/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-50/18 21/16-50/18 21/8-50/36 63/8-50/18 21/24-50/18 21/8-50/54 21/40-50/18 21/8-50/90 21/56-50/18