Subtract 18/21 from 6/30
6/30 - 18/21 is -23/35.
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,
6/30 = 6 × 7/30 × 7 = 42/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
18/21 = 18 × 10/21 × 10 = 180/210 - Subtract the two like fractions:
42/210 - 180/210 = 42 - 180/210 = -138/210 - After reducing the fraction, the answer is -23/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/30-18/21 6/30-36/21 6/60-18/21 6/30-18/42 18/30-18/21 6/30-54/21 6/90-18/21 6/30-18/63 6/30-90/21 42/30-18/21