Subtract 21/48 from 7/45
7/45 - 21/48 is -203/720.
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,
7/45 = 7 × 16/45 × 16 = 112/720 - Likewise, for the 2nd fraction, since 48 × 15 = 720,
21/48 = 21 × 15/48 × 15 = 315/720 - Subtract the two like fractions:
112/720 - 315/720 = 112 - 315/720 = -203/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45-21/48 7/45-42/48 7/90-21/48 7/45-21/96 21/45-21/48 7/45-63/48 35/45-21/48 49/45-21/48