Subtract 42/9 from 20/45
1st number: 20/45, 2nd number: 4 6/9
20/45 - 42/9 is -38/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
20/45 = 20 × 1/45 × 1 = 20/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
42/9 = 42 × 5/9 × 5 = 210/45 - Subtract the two like fractions:
20/45 - 210/45 = 20 - 210/45 = -190/45 - After reducing the fraction, the answer is -38/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-42/9 20/45-84/9 20/90-42/9 20/45-42/18 60/45-42/9 20/45-42/27 20/45-42/45 20/45-42/63