Subtract 5/7 from 18/45
18/45 - 5/7 is -11/35.
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,
18/45 = 18 × 7/45 × 7 = 126/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
5/7 = 5 × 45/7 × 45 = 225/315 - Subtract the two like fractions:
126/315 - 225/315 = 126 - 225/315 = -99/315 - After reducing the fraction, the answer is -11/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45-5/7 18/45-10/7 18/90-5/7 18/45-5/14 54/45-5/7 18/45-15/7 18/45-5/21 90/45-5/7 18/45-25/7 18/45-5/35 18/45-35/7 18/45-5/49