Subtract 15/45 from 3/7
3/7 - 15/45 is 2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
3/7 = 3 × 45/7 × 45 = 135/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
15/45 = 15 × 7/45 × 7 = 105/315 - Subtract the two like fractions:
135/315 - 105/315 = 135 - 105/315 = 30/315 - After reducing the fraction, the answer is 2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-15/45 3/7-30/45 3/14-15/45 3/7-15/90 9/7-15/45 3/21-15/45 15/7-15/45 3/7-75/45 3/35-15/45 21/7-15/45 3/49-15/45