Subtract 42/45 from 8/42
8/42 - 42/45 is -26/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
8/42 = 8 × 15/42 × 15 = 120/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
42/45 = 42 × 14/45 × 14 = 588/630 - Subtract the two like fractions:
120/630 - 588/630 = 120 - 588/630 = -468/630 - After reducing the fraction, the answer is -26/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42-42/45 8/42-84/45 8/84-42/45 8/42-42/90 24/42-42/45 40/42-42/45 56/42-42/45