Subtract 30/21 from 27/70
1st number: 27/70, 2nd number: 1 9/21
27/70 - 30/21 is -73/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
27/70 = 27 × 3/70 × 3 = 81/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
30/21 = 30 × 10/21 × 10 = 300/210 - Subtract the two like fractions:
81/210 - 300/210 = 81 - 300/210 = -219/210 - After reducing the fraction, the answer is -73/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70-30/21 27/70-60/21 27/70-30/42 81/70-30/21 27/70-90/21 27/70-30/63