Subtract 42/40 from 28/9
1st number: 3 1/9, 2nd number: 1 2/40
28/9 - 42/40 is 371/180.
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,
28/9 = 28 × 40/9 × 40 = 1120/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
42/40 = 42 × 9/40 × 9 = 378/360 - Subtract the two like fractions:
1120/360 - 378/360 = 1120 - 378/360 = 742/360 - After reducing the fraction, the answer is 371/180
- In mixed form: 211/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/9-42/40 28/9-84/40 28/18-42/40 28/9-42/80 84/9-42/40 28/27-42/40 28/45-42/40 28/63-42/40