Subtract 42/90 from 10/63
10/63 - 42/90 is -97/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
10/63 = 10 × 10/63 × 10 = 100/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Subtract the two like fractions:
100/630 - 294/630 = 100 - 294/630 = -194/630 - After reducing the fraction, the answer is -97/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/63-42/90 10/63-84/90 30/63-42/90 50/63-42/90 70/63-42/90