Add 5/20 and 21/84
5/20 + 21/84 is 1/2.
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,
21/84 = 21 × 5/84 × 5 = 105/420 - Add the two like fractions:
105/420 + 105/420 = 105 + 105/420 = 210/420 - 210/420 simplified gives 1/2
- So, 5/20 + 21/84 = 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+21/84 5/20+42/84 5/40+21/84 15/20+21/84 5/20+63/84 5/60+21/84 25/20+21/84 35/20+21/84