Subtract 50/42 from 20/45
1st number: 20/45, 2nd number: 1 8/42
20/45 - 50/42 is -47/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
20/45 = 20 × 14/45 × 14 = 280/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
50/42 = 50 × 15/42 × 15 = 750/630 - Subtract the two like fractions:
280/630 - 750/630 = 280 - 750/630 = -470/630 - After reducing the fraction, the answer is -47/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-50/42 20/90-50/42 20/45-50/84 60/45-50/42