Subtract 20/9 from 42/45
1st number: 42/45, 2nd number: 2 2/9
42/45 - 20/9 is -58/45.
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,
42/45 = 42 × 1/45 × 1 = 42/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
20/9 = 20 × 5/9 × 5 = 100/45 - Subtract the two like fractions:
42/45 - 100/45 = 42 - 100/45 = -58/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-20/9 42/45-40/9 42/90-20/9 42/45-20/18 42/45-60/9 42/45-20/27 42/45-20/45 42/45-20/63