Subtract 9/7 from 15/42
1st number: 15/42, 2nd number: 1 2/7
15/42 - 9/7 is -13/14.
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,
15/42 = 15 × 1/42 × 1 = 15/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
9/7 = 9 × 6/7 × 6 = 54/42 - Subtract the two like fractions:
15/42 - 54/42 = 15 - 54/42 = -39/42 - After reducing the fraction, the answer is -13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-9/7 15/42-18/7 15/84-9/7 15/42-9/14 45/42-9/7 15/42-27/7 15/42-9/21 75/42-9/7 15/42-45/7 15/42-9/35 15/42-63/7 15/42-9/49