Subtract 15/49 from 10/42
10/42 - 15/49 is -10/147.
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,
10/42 = 10 × 7/42 × 7 = 70/294 - Likewise, for the 2nd fraction, since 49 × 6 = 294,
15/49 = 15 × 6/49 × 6 = 90/294 - Subtract the two like fractions:
70/294 - 90/294 = 70 - 90/294 = -20/294 - After reducing the fraction, the answer is -10/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-15/49 10/42-30/49 10/84-15/49 10/42-15/98 30/42-15/49 10/42-45/49 50/42-15/49 10/42-75/49 70/42-15/49