Subtract 90/8 from 81/45
1st number: 1 36/45, 2nd number: 11 2/8
81/45 - 90/8 is -189/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
81/45 = 81 × 8/45 × 8 = 648/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
90/8 = 90 × 45/8 × 45 = 4050/360 - Subtract the two like fractions:
648/360 - 4050/360 = 648 - 4050/360 = -3402/360 - After reducing the fraction, the answer is -189/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/90-90/8 81/45-90/16 81/45-90/24 81/45-90/40 81/45-90/56