Subtract 42/63 from 56/90
56/90 - 42/63 is -2/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
56/90 = 56 × 7/90 × 7 = 392/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
42/63 = 42 × 10/63 × 10 = 420/630 - Subtract the two like fractions:
392/630 - 420/630 = 392 - 420/630 = -28/630 - After reducing the fraction, the answer is -2/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-84/63