Subtract 12/70 from 21/18
1st number: 1 3/18, 2nd number: 12/70
21/18 - 12/70 is 209/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
21/18 = 21 × 35/18 × 35 = 735/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630 - Subtract the two like fractions:
735/630 - 108/630 = 735 - 108/630 = 627/630 - After reducing the fraction, the answer is 209/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-12/70 21/18-24/70 21/36-12/70 63/18-12/70 21/18-36/70 21/54-12/70 21/18-60/70 21/90-12/70 21/18-84/70