Subtract 40/7 from 15/45
1st number: 15/45, 2nd number: 5 5/7
15/45 - 40/7 is -113/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
15/45 = 15 × 7/45 × 7 = 105/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
40/7 = 40 × 45/7 × 45 = 1800/315 - Subtract the two like fractions:
105/315 - 1800/315 = 105 - 1800/315 = -1695/315 - After reducing the fraction, the answer is -113/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/45-40/7 15/45-80/7 15/90-40/7 15/45-40/14 15/45-40/21 75/45-40/7 15/45-40/35 15/45-40/49