Subtract 90/60 from 28/45
1st number: 28/45, 2nd number: 1 30/60
28/45 - 90/60 is -79/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 60 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
28/45 = 28 × 4/45 × 4 = 112/180 - Likewise, for the 2nd fraction, since 60 × 3 = 180,
90/60 = 90 × 3/60 × 3 = 270/180 - Subtract the two like fractions:
112/180 - 270/180 = 112 - 270/180 = -158/180 - After reducing the fraction, the answer is -79/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/45-90/60 28/90-90/60 84/45-90/60