Subtract 5/30 from 10/21
10/21 - 5/30 is 13/42.
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,
10/21 = 10 × 10/21 × 10 = 100/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
5/30 = 5 × 7/30 × 7 = 35/210 - Subtract the two like fractions:
100/210 - 35/210 = 100 - 35/210 = 65/210 - After reducing the fraction, the answer is 13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-5/30 10/21-10/30 10/42-5/30 10/21-5/60 30/21-5/30 10/21-15/30 10/63-5/30 10/21-5/90 50/21-5/30 10/21-25/30 70/21-5/30 10/21-35/30