Subtract 9/5 from 21/45
1st number: 21/45, 2nd number: 1 4/5
21/45 - 9/5 is -4/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 5 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Likewise, for the 2nd fraction, since 5 × 9 = 45,
9/5 = 9 × 9/5 × 9 = 81/45 - Subtract the two like fractions:
21/45 - 81/45 = 21 - 81/45 = -60/45 - After reducing the fraction, the answer is -4/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-9/5 21/45-18/5 21/90-9/5 21/45-9/10 63/45-9/5 21/45-27/5 21/45-9/15 21/45-45/5 21/45-9/25 21/45-63/5 21/45-9/35