Subtract 30/21 from 30/10
1st number: 3 0/10, 2nd number: 1 9/21
30/10 - 30/21 is 11/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
30/10 = 30 × 21/10 × 21 = 630/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
30/21 = 30 × 10/21 × 10 = 300/210 - Subtract the two like fractions:
630/210 - 300/210 = 630 - 300/210 = 330/210 - After reducing the fraction, the answer is 11/7
- In mixed form: 14/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/10-30/21 30/10-60/21 30/20-30/21 30/10-30/42 90/10-30/21 30/10-90/21 30/10-30/63 30/50-30/21 30/70-30/21