Subtract 3/7 from 42/45
42/45 - 3/7 is 53/105.
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,
42/45 = 42 × 7/45 × 7 = 294/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
3/7 = 3 × 45/7 × 45 = 135/315 - Subtract the two like fractions:
294/315 - 135/315 = 294 - 135/315 = 159/315 - After reducing the fraction, the answer is 53/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-3/7 42/45-6/7 42/90-3/7 42/45-3/14 42/45-9/7 42/45-3/21 42/45-15/7 42/45-3/35 42/45-21/7 42/45-3/49