Subtract 20/35 from 1/21
1/21 - 20/35 is -11/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
20/35 = 20 × 3/35 × 3 = 60/105 - Subtract the two like fractions:
5/105 - 60/105 = 5 - 60/105 = -55/105 - After reducing the fraction, the answer is -11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-20/35 1/21-40/35 1/42-20/35 1/21-20/70 3/21-20/35 1/21-60/35 1/63-20/35 5/21-20/35 7/21-20/35