Subtract 6/21 from 27/30
27/30 - 6/21 is 43/70.
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,
27/30 = 27 × 7/30 × 7 = 189/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
6/21 = 6 × 10/21 × 10 = 60/210 - Subtract the two like fractions:
189/210 - 60/210 = 189 - 60/210 = 129/210 - After reducing the fraction, the answer is 43/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30-6/21 27/30-12/21 27/60-6/21 27/30-6/42 81/30-6/21 27/30-18/21 27/90-6/21 27/30-6/63 27/30-30/21 27/30-42/21