Add 21/40 and 20/27
21/40 + 20/27 is 1367/1080.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 27 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 40 × 27 = 1080,
21/40 = 21 × 27/40 × 27 = 567/1080 - Likewise, for the 2nd fraction, since 27 × 40 = 1080,
20/27 = 20 × 40/27 × 40 = 800/1080 - Add the two like fractions:
567/1080 + 800/1080 = 567 + 800/1080 = 1367/1080 - So, 21/40 + 20/27 = 1367/1080
In mixed form: 1287/1080
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+20/27 21/40+40/27 21/80+20/27 21/40+20/54 63/40+20/27 21/40+60/27 21/40+20/81