Subtract 20/21 from 2/30
2/30 - 20/21 is -31/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
2/30 = 2 × 7/30 × 7 = 14/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
20/21 = 20 × 10/21 × 10 = 200/210 - Subtract the two like fractions:
14/210 - 200/210 = 14 - 200/210 = -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: 4/30-20/21 2/30-40/21 2/60-20/21 2/30-20/42 6/30-20/21 2/30-60/21 2/90-20/21 2/30-20/63 10/30-20/21 14/30-20/21