Subtract 42/36 from 28/45
1st number: 28/45, 2nd number: 1 6/36
28/45 - 42/36 is -49/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 36 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 36 × 5 = 180,
42/36 = 42 × 5/36 × 5 = 210/180 - Subtract the two like fractions:
112/180 - 210/180 = 112 - 210/180 = -98/180 - After reducing the fraction, the answer is -49/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/45-42/36 28/45-84/36 28/90-42/36 28/45-42/72 84/45-42/36