Subtract 42/7 from 15/9
1st number: 1 6/9, 2nd number: 6 0/7
15/9 - 42/7 is -13/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
15/9 = 15 × 7/9 × 7 = 105/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
42/7 = 42 × 9/7 × 9 = 378/63 - Subtract the two like fractions:
105/63 - 378/63 = 105 - 378/63 = -273/63 - After reducing the fraction, the answer is -13/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/9-42/7 15/9-84/7 15/18-42/7 15/9-42/14 45/9-42/7 15/27-42/7 15/9-42/21 75/9-42/7 15/45-42/7 15/9-42/35 15/63-42/7 15/9-42/49