Subtract 1/18 from 21/35
21/35 - 1/18 is 49/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
21/35 = 21 × 18/35 × 18 = 378/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
1/18 = 1 × 35/18 × 35 = 35/630 - Subtract the two like fractions:
378/630 - 35/630 = 378 - 35/630 = 343/630 - After reducing the fraction, the answer is 49/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35-1/18 21/35-2/18 21/70-1/18 21/35-1/36 63/35-1/18 21/35-3/18 21/35-1/54 21/35-5/18 21/35-1/90 21/35-7/18