Subtract 21/9 from 75/45
1st number: 1 30/45, 2nd number: 2 3/9
75/45 - 21/9 is -2/3.
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,
75/45 = 75 × 1/45 × 1 = 75/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Subtract the two like fractions:
75/45 - 105/45 = 75 - 105/45 = -30/45 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/45-42/9 75/90-21/9 75/45-21/18 75/45-63/9 75/45-21/27 75/45-21/45 75/45-21/63