Subtract 21/16 from 7/90
1st number: 7/90, 2nd number: 1 5/16
7/90 - 21/16 is -889/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 16 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
7/90 = 7 × 8/90 × 8 = 56/720 - Likewise, for the 2nd fraction, since 16 × 45 = 720,
21/16 = 21 × 45/16 × 45 = 945/720 - Subtract the two like fractions:
56/720 - 945/720 = 56 - 945/720 = -889/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-21/16 7/90-42/16 7/90-21/32 21/90-21/16 7/90-63/16 7/90-21/48 35/90-21/16 7/90-21/80 49/90-21/16