Add 5/20 and 81/84
5/20 + 81/84 is 17/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
81/84 = 81 × 5/84 × 5 = 405/420 - Add the two like fractions:
105/420 + 405/420 = 105 + 405/420 = 510/420 - 510/420 simplified gives 17/14
- So, 5/20 + 81/84 = 17/14
In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+81/84 5/40+81/84 15/20+81/84 5/60+81/84 25/20+81/84 35/20+81/84