Subtract 81/90 from 7/16
7/16 - 81/90 is -37/80.
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,
7/16 = 7 × 45/16 × 45 = 315/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
81/90 = 81 × 8/90 × 8 = 648/720 - Subtract the two like fractions:
315/720 - 648/720 = 315 - 648/720 = -333/720 - After reducing the fraction, the answer is -37/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/16-81/90 7/32-81/90 21/16-81/90 7/48-81/90 35/16-81/90 7/80-81/90 49/16-81/90