Subtract 45/25 from 18/28
1st number: 18/28, 2nd number: 1 20/25
18/28 - 45/25 is -81/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 25 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 28 × 25 = 700,
18/28 = 18 × 25/28 × 25 = 450/700 - Likewise, for the 2nd fraction, since 25 × 28 = 700,
45/25 = 45 × 28/25 × 28 = 1260/700 - Subtract the two like fractions:
450/700 - 1260/700 = 450 - 1260/700 = -810/700 - After reducing the fraction, the answer is -81/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-45/25 18/28-90/25 18/56-45/25 18/28-45/50 54/28-45/25 18/84-45/25 18/28-45/75 90/28-45/25