Subtract 10/30 from 40/21
1st number: 1 19/21, 2nd number: 10/30
40/21 - 10/30 is 11/7.
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,
40/21 = 40 × 10/21 × 10 = 400/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Subtract the two like fractions:
400/210 - 70/210 = 400 - 70/210 = 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: 80/21-10/30 40/21-20/30 40/42-10/30 40/21-10/60 40/63-10/30 40/21-10/90 40/21-50/30 40/21-70/30