Subtract 42/20 from 7/9
1st number: 7/9, 2nd number: 2 2/20
7/9 - 42/20 is -119/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
7/9 = 7 × 20/9 × 20 = 140/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
42/20 = 42 × 9/20 × 9 = 378/180 - Subtract the two like fractions:
140/180 - 378/180 = 140 - 378/180 = -238/180 - After reducing the fraction, the answer is -119/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/9-42/20 7/9-84/20 7/18-42/20 7/9-42/40 21/9-42/20 7/27-42/20 7/9-42/60 35/9-42/20 7/45-42/20 49/9-42/20 7/63-42/20