Subtract 15/7 from 10/42
1st number: 10/42, 2nd number: 2 1/7
10/42 - 15/7 is -40/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
10/42 = 10 × 1/42 × 1 = 10/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
15/7 = 15 × 6/7 × 6 = 90/42 - Subtract the two like fractions:
10/42 - 90/42 = 10 - 90/42 = -80/42 - After reducing the fraction, the answer is -40/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-15/7 10/42-30/7 10/84-15/7 10/42-15/14 30/42-15/7 10/42-45/7 10/42-15/21 50/42-15/7 10/42-75/7 10/42-15/35 70/42-15/7 10/42-15/49