Subtract 90/45 from 15/8
1st number: 1 7/8, 2nd number: 2 0/45
15/8 - 90/45 is -1/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
15/8 = 15 × 45/8 × 45 = 675/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
90/45 = 90 × 8/45 × 8 = 720/360 - Subtract the two like fractions:
675/360 - 720/360 = 675 - 720/360 = -45/360 - After reducing the fraction, the answer is -1/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8-90/45 15/16-90/45 45/8-90/45 15/24-90/45 75/8-90/45 15/40-90/45 15/56-90/45