Subtract 21/18 from 10/70
1st number: 10/70, 2nd number: 1 3/18
10/70 - 21/18 is -43/42.
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,
10/70 = 10 × 9/70 × 9 = 90/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630 - Subtract the two like fractions:
90/630 - 735/630 = 90 - 735/630 = -645/630 - After reducing the fraction, the answer is -43/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/70-21/18 10/70-42/18 10/70-21/36 30/70-21/18 10/70-63/18 10/70-21/54 50/70-21/18 10/70-21/90