Subtract 42/45 from 4/7
4/7 - 42/45 is -38/105.
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,
4/7 = 4 × 45/7 × 45 = 180/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
42/45 = 42 × 7/45 × 7 = 294/315 - Subtract the two like fractions:
180/315 - 294/315 = 180 - 294/315 = -114/315 - After reducing the fraction, the answer is -38/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-42/45 4/7-84/45 4/14-42/45 4/7-42/90 12/7-42/45 4/21-42/45 20/7-42/45 4/35-42/45 28/7-42/45 4/49-42/45