Subtract 56/18 from 21/70
1st number: 21/70, 2nd number: 3 2/18
21/70 - 56/18 is -253/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
56/18 = 56 × 35/18 × 35 = 1960/630 - Subtract the two like fractions:
189/630 - 1960/630 = 189 - 1960/630 = -1771/630 - After reducing the fraction, the answer is -253/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-56/18 21/70-56/36 63/70-56/18 21/70-56/54 21/70-56/90