Subtract 21/30 from 27/70
27/70 - 21/30 is -11/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 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 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
81/210 - 147/210 = 81 - 147/210 = -66/210 - After reducing the fraction, the answer is -11/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70-21/30 27/70-42/30 27/70-21/60 81/70-21/30 27/70-63/30 27/70-21/90