Subtract 84/63 from 18/70
1st number: 18/70, 2nd number: 1 21/63
18/70 - 84/63 is -113/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
18/70 = 18 × 9/70 × 9 = 162/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
84/63 = 84 × 10/63 × 10 = 840/630 - Subtract the two like fractions:
162/630 - 840/630 = 162 - 840/630 = -678/630 - After reducing the fraction, the answer is -113/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/70-84/63 54/70-84/63 90/70-84/63