Subtract 90/35 from 42/45
1st number: 42/45, 2nd number: 2 20/35
42/45 - 90/35 is -172/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 35 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 35 × 9 = 315,
90/35 = 90 × 9/35 × 9 = 810/315 - Subtract the two like fractions:
294/315 - 810/315 = 294 - 810/315 = -516/315 - After reducing the fraction, the answer is -172/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-90/35 42/90-90/35 42/45-90/70