Subtract 12/24 from 20/45
20/45 - 12/24 is -1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 24 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
20/45 = 20 × 8/45 × 8 = 160/360 - Likewise, for the 2nd fraction, since 24 × 15 = 360,
12/24 = 12 × 15/24 × 15 = 180/360 - Subtract the two like fractions:
160/360 - 180/360 = 160 - 180/360 = -20/360 - After reducing the fraction, the answer is -1/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-12/24 20/90-12/24 20/45-12/48 60/45-12/24 20/45-36/24 20/45-12/72 20/45-60/24 20/45-84/24