Subtract 40/49 from 20/28
20/28 - 40/49 is -5/49.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 49 is 196
Next, find the equivalent fraction of both fractional numbers with denominator 196 - For the 1st fraction, since 28 × 7 = 196,
20/28 = 20 × 7/28 × 7 = 140/196 - Likewise, for the 2nd fraction, since 49 × 4 = 196,
40/49 = 40 × 4/49 × 4 = 160/196 - Subtract the two like fractions:
140/196 - 160/196 = 140 - 160/196 = -20/196 - After reducing the fraction, the answer is -5/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28-40/49 20/28-80/49 20/56-40/49 20/28-40/98 60/28-40/49 20/84-40/49