Subtract 1/80 from 21/27, Solve 21/27

Subtract 1/80 from 21/27

21/27 - 1/80 is 551/720.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 80 is 2160

Next, find the equivalent fraction of both fractional numbers with denominator 2160
For the 1st fraction, since 27 × 80 = 2160,
21/27 = 21 × 80/27 × 80 = 1680/2160
Likewise, for the 2nd fraction, since 80 × 27 = 2160,
1/80 = 1 × 27/80 × 27 = 27/2160
Subtract the two like fractions:
1680/2160 - 27/2160 = 1680 - 27/2160 = 1653/2160
After reducing the fraction, the answer is 551/720

MathStep (Works offline)

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