Subtract 45/21 from 18/80
1st number: 18/80, 2nd number: 2 3/21
18/80 - 45/21 is -537/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
18/80 = 18 × 21/80 × 21 = 378/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
45/21 = 45 × 80/21 × 80 = 3600/1680 - Subtract the two like fractions:
378/1680 - 3600/1680 = 378 - 3600/1680 = -3222/1680 - After reducing the fraction, the answer is -537/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/80-45/21 18/80-90/21 18/80-45/42 54/80-45/21 18/80-45/63 90/80-45/21