Subtract 70/49 from 10/42
1st number: 10/42, 2nd number: 1 21/49
10/42 - 70/49 is -25/21.
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,
70/49 = 70 × 6/49 × 6 = 420/294 - Subtract the two like fractions:
70/294 - 420/294 = 70 - 420/294 = -350/294 - After reducing the fraction, the answer is -25/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-70/49 10/84-70/49 10/42-70/98 30/42-70/49 50/42-70/49 70/42-70/49