Subtract 48/45 from 21/80
1st number: 21/80, 2nd number: 1 3/45
21/80 - 48/45 is -193/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,
48/45 = 48 × 16/45 × 16 = 768/720 - Subtract the two like fractions:
189/720 - 768/720 = 189 - 768/720 = -579/720 - After reducing the fraction, the answer is -193/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80-48/45 21/80-96/45 21/80-48/90 63/80-48/45