Subtract 1/90 from 15/8
1st number: 1 7/8, 2nd number: 1/90
15/8 - 1/90 is 671/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 90 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 90 × 4 = 360,
1/90 = 1 × 4/90 × 4 = 4/360 - Subtract the two like fractions:
675/360 - 4/360 = 675 - 4/360 = 671/360 - In mixed form: 1311/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8-1/90 15/8-2/90 15/16-1/90 45/8-1/90 15/8-3/90 15/24-1/90 75/8-1/90 15/8-5/90 15/40-1/90 15/8-7/90 15/56-1/90