Subtract 9/30 from 2/21
2/21 - 9/30 is -43/210.
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,
2/21 = 2 × 10/21 × 10 = 20/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
9/30 = 9 × 7/30 × 7 = 63/210 - Subtract the two like fractions:
20/210 - 63/210 = 20 - 63/210 = -43/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-9/30 2/21-18/30 2/42-9/30 2/21-9/60 6/21-9/30 2/21-27/30 2/63-9/30 2/21-9/90 10/21-9/30 2/21-45/30 14/21-9/30 2/21-63/30