Subtract 2/30 from 20/21
20/21 - 2/30 is 31/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
20/21 = 20 × 10/21 × 10 = 200/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
2/30 = 2 × 7/30 × 7 = 14/210 - Subtract the two like fractions:
200/210 - 14/210 = 200 - 14/210 = 186/210 - After reducing the fraction, the answer is 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-2/30 20/21-4/30 20/42-2/30 20/21-2/60 60/21-2/30 20/21-6/30 20/63-2/30 20/21-2/90 20/21-10/30 20/21-14/30