Subtract 8/70 from 7/63
7/63 - 8/70 is -1/315.
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,
7/63 = 7 × 10/63 × 10 = 70/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
8/70 = 8 × 9/70 × 9 = 72/630 - Subtract the two like fractions:
70/630 - 72/630 = 70 - 72/630 = -2/630 - After reducing the fraction, the answer is -1/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/63-8/70 7/63-16/70 21/63-8/70 7/63-24/70 35/63-8/70 7/63-40/70 49/63-8/70 7/63-56/70