Subtract 21/16 from 90/8
1st number: 11 2/8, 2nd number: 1 5/16
90/8 - 21/16 is 159/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 16 is 16
Next, find the equivalent fraction of both fractional numbers with denominator 16 - For the 1st fraction, since 8 × 2 = 16,
90/8 = 90 × 2/8 × 2 = 180/16 - Likewise, for the 2nd fraction, since 16 × 1 = 16,
21/16 = 21 × 1/16 × 1 = 21/16 - Subtract the two like fractions:
180/16 - 21/16 = 180 - 21/16 = 159/16 - In mixed form: 915/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8-42/16 90/16-21/16 90/8-21/32 90/8-63/16 90/24-21/16 90/8-21/48 90/40-21/16 90/8-21/80 90/56-21/16