Subtract 21/49 from 30/80
30/80 - 21/49 is -3/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 49 is 3920
Next, find the equivalent fraction of both fractional numbers with denominator 3920 - For the 1st fraction, since 80 × 49 = 3920,
30/80 = 30 × 49/80 × 49 = 1470/3920 - Likewise, for the 2nd fraction, since 49 × 80 = 3920,
21/49 = 21 × 80/49 × 80 = 1680/3920 - Subtract the two like fractions:
1470/3920 - 1680/3920 = 1470 - 1680/3920 = -210/3920 - After reducing the fraction, the answer is -3/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80-21/49 30/80-42/49 30/80-21/98 90/80-21/49 30/80-63/49