Subtract 7/8 from 28/45
28/45 - 7/8 is -91/360.
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,
28/45 = 28 × 8/45 × 8 = 224/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
7/8 = 7 × 45/8 × 45 = 315/360 - Subtract the two like fractions:
224/360 - 315/360 = 224 - 315/360 = -91/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/45-7/8 28/45-14/8 28/90-7/8 28/45-7/16 84/45-7/8 28/45-21/8 28/45-7/24 28/45-35/8 28/45-7/40 28/45-49/8 28/45-7/56