Subtract 28/49 from 9/20
9/20 - 28/49 is -17/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 49 is 980
Next, find the equivalent fraction of both fractional numbers with denominator 980 - For the 1st fraction, since 20 × 49 = 980,
9/20 = 9 × 49/20 × 49 = 441/980 - Likewise, for the 2nd fraction, since 49 × 20 = 980,
28/49 = 28 × 20/49 × 20 = 560/980 - Subtract the two like fractions:
441/980 - 560/980 = 441 - 560/980 = -119/980 - After reducing the fraction, the answer is -17/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-28/49 9/20-56/49 9/40-28/49 9/20-28/98 27/20-28/49 9/20-84/49 9/60-28/49 45/20-28/49 63/20-28/49