Subtract 81/70 from 1/63
1st number: 1/63, 2nd number: 1 11/70
1/63 - 81/70 is -719/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 63 × 10 = 630,
1/63 = 1 × 10/63 × 10 = 10/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Subtract the two like fractions:
10/630 - 729/630 = 10 - 729/630 = -719/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/63-81/70 3/63-81/70 5/63-81/70 7/63-81/70