Subtract 21/48 from 9/45
9/45 - 21/48 is -19/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 48 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
9/45 = 9 × 16/45 × 16 = 144/720 - Likewise, for the 2nd fraction, since 48 × 15 = 720,
21/48 = 21 × 15/48 × 15 = 315/720 - Subtract the two like fractions:
144/720 - 315/720 = 144 - 315/720 = -171/720 - After reducing the fraction, the answer is -19/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/45-21/48 9/45-42/48 9/90-21/48 9/45-21/96 27/45-21/48 9/45-63/48 63/45-21/48