Subtract 75/20 from 21/9
1st number: 2 3/9, 2nd number: 3 15/20
21/9 - 75/20 is -17/12.
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,
21/9 = 21 × 20/9 × 20 = 420/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
75/20 = 75 × 9/20 × 9 = 675/180 - Subtract the two like fractions:
420/180 - 675/180 = 420 - 675/180 = -255/180 - After reducing the fraction, the answer is -17/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9-75/20 21/18-75/20 21/9-75/40 63/9-75/20 21/27-75/20 21/9-75/60 21/45-75/20 21/63-75/20