Subtract 9/70 from 21/27
21/27 - 9/70 is 409/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 70 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 27 × 70 = 1890,
21/27 = 21 × 70/27 × 70 = 1470/1890 - Likewise, for the 2nd fraction, since 70 × 27 = 1890,
9/70 = 9 × 27/70 × 27 = 243/1890 - Subtract the two like fractions:
1470/1890 - 243/1890 = 1470 - 243/1890 = 1227/1890 - After reducing the fraction, the answer is 409/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-9/70 21/27-18/70 21/54-9/70 63/27-9/70 21/27-27/70 21/81-9/70 21/27-45/70 21/27-63/70