Add 21/72 and 21/80
21/72 + 21/80 is 133/240.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 72 × 10 = 720,
21/72 = 21 × 10/72 × 10 = 210/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Add the two like fractions:
210/720 + 189/720 = 210 + 189/720 = 399/720 - 399/720 simplified gives 133/240
- So, 21/72 + 21/80 = 133/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+21/80 21/72+42/80 63/72+21/80 21/72+63/80