Subtract 20/49 from 40/42
40/42 - 20/49 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,
40/42 = 40 × 7/42 × 7 = 280/294 - Likewise, for the 2nd fraction, since 49 × 6 = 294,
20/49 = 20 × 6/49 × 6 = 120/294 - Subtract the two like fractions:
280/294 - 120/294 = 280 - 120/294 = 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: 80/42-20/49 40/42-40/49 40/84-20/49 40/42-20/98 40/42-60/49