Subtract 50/49 from 20/42
1st number: 20/42, 2nd number: 1 1/49
20/42 - 50/49 is -80/147.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 49 is 294
Next, find the equivalent fraction of both fractional numbers with denominator 294 - For the 1st fraction, since 42 × 7 = 294,
20/42 = 20 × 7/42 × 7 = 140/294 - Likewise, for the 2nd fraction, since 49 × 6 = 294,
50/49 = 50 × 6/49 × 6 = 300/294 - Subtract the two like fractions:
140/294 - 300/294 = 140 - 300/294 = -160/294 - After reducing the fraction, the answer is -80/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-50/49 20/84-50/49 20/42-50/98 60/42-50/49