Subtract 30/63 from 42/45
42/45 - 30/63 is 16/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 63 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 63 × 5 = 315,
30/63 = 30 × 5/63 × 5 = 150/315 - Subtract the two like fractions:
294/315 - 150/315 = 294 - 150/315 = 144/315 - After reducing the fraction, the answer is 16/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-30/63 42/45-60/63 42/90-30/63 42/45-90/63