Add 21/84 and 27/20
1st number: 21/84, 2nd number: 1 7/20
21/84 + 27/20 is 8/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
27/20 = 27 × 21/20 × 21 = 567/420 - Add the two like fractions:
105/420 + 567/420 = 105 + 567/420 = 672/420 - 672/420 simplified gives 8/5
- So, 21/84 + 27/20 = 8/5
In mixed form: 13/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+27/20 21/84+54/20 21/84+27/40 63/84+27/20 21/84+81/20 21/84+27/60