Subtract 84/70 from 20/63
1st number: 20/63, 2nd number: 1 14/70
20/63 - 84/70 is -278/315.
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,
20/63 = 20 × 10/63 × 10 = 200/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
84/70 = 84 × 9/70 × 9 = 756/630 - Subtract the two like fractions:
200/630 - 756/630 = 200 - 756/630 = -556/630 - After reducing the fraction, the answer is -278/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/63-84/70 60/63-84/70