Subtract 18/45 from 2/7
2/7 - 18/45 is -4/35.
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,
2/7 = 2 × 45/7 × 45 = 90/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
18/45 = 18 × 7/45 × 7 = 126/315 - Subtract the two like fractions:
90/315 - 126/315 = 90 - 126/315 = -36/315 - After reducing the fraction, the answer is -4/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-18/45 2/7-36/45 2/14-18/45 2/7-18/90 6/7-18/45 2/7-54/45 2/21-18/45 10/7-18/45 2/7-90/45 2/35-18/45 14/7-18/45 2/49-18/45