Subtract 42/40 from 20/9
1st number: 2 2/9, 2nd number: 1 2/40
20/9 - 42/40 is 211/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 9 × 40 = 360,
20/9 = 20 × 40/9 × 40 = 800/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
42/40 = 42 × 9/40 × 9 = 378/360 - Subtract the two like fractions:
800/360 - 378/360 = 800 - 378/360 = 422/360 - After reducing the fraction, the answer is 211/180
- In mixed form: 131/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/9-42/40 20/9-84/40 20/18-42/40 20/9-42/80 60/9-42/40 20/27-42/40 20/45-42/40 20/63-42/40