Subtract 18/84 from 20/45
20/45 - 18/84 is 29/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 45 × 28 = 1260,
20/45 = 20 × 28/45 × 28 = 560/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
18/84 = 18 × 15/84 × 15 = 270/1260 - Subtract the two like fractions:
560/1260 - 270/1260 = 560 - 270/1260 = 290/1260 - After reducing the fraction, the answer is 29/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-18/84 20/45-36/84 20/90-18/84 60/45-18/84 20/45-54/84 20/45-90/84