Subtract 5/27 from 21/70, Solve 21/70

Subtract 5/27 from 21/70

21/70 - 5/27 is 31/270.

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,
21/70 = 21 × 27/70 × 27 = 567/1890
Likewise, for the 2nd fraction, since 27 × 70 = 1890,
5/27 = 5 × 70/27 × 70 = 350/1890
Subtract the two like fractions:
567/1890 - 350/1890 = 567 - 350/1890 = 217/1890
After reducing the fraction, the answer is 31/270

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad