Subtract 16/90 from 21/16
1st number: 1 5/16, 2nd number: 16/90
21/16 - 16/90 is 817/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 16 × 45 = 720,
21/16 = 21 × 45/16 × 45 = 945/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
16/90 = 16 × 8/90 × 8 = 128/720 - Subtract the two like fractions:
945/720 - 128/720 = 945 - 128/720 = 817/720 - In mixed form: 197/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16-16/90 21/16-32/90 21/32-16/90 63/16-16/90 21/16-48/90 21/48-16/90 21/16-80/90 21/80-16/90