Subtract 21/16 from 9/90
1st number: 9/90, 2nd number: 1 5/16
9/90 - 21/16 is -97/80.
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,
9/90 = 9 × 8/90 × 8 = 72/720 - Likewise, for the 2nd fraction, since 16 × 45 = 720,
21/16 = 21 × 45/16 × 45 = 945/720 - Subtract the two like fractions:
72/720 - 945/720 = 72 - 945/720 = -873/720 - After reducing the fraction, the answer is -97/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90-21/16 9/90-42/16 9/90-21/32 27/90-21/16 9/90-63/16 9/90-21/48 45/90-21/16 9/90-21/80 63/90-21/16