Subtract 21/27 from 15/70
15/70 - 21/27 is -71/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 27 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 70 × 27 = 1890,
15/70 = 15 × 27/70 × 27 = 405/1890 - Likewise, for the 2nd fraction, since 27 × 70 = 1890,
21/27 = 21 × 70/27 × 70 = 1470/1890 - Subtract the two like fractions:
405/1890 - 1470/1890 = 405 - 1470/1890 = -1065/1890 - After reducing the fraction, the answer is -71/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70-21/27 15/70-42/27 15/70-21/54 45/70-21/27 15/70-63/27 15/70-21/81 75/70-21/27