Add 21/5 and 84/20
1st number: 4 1/5, 2nd number: 4 4/20
21/5 + 84/20 is 42/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 5 × 4 = 20,
21/5 = 21 × 4/5 × 4 = 84/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
84/20 = 84 × 1/20 × 1 = 84/20 - Add the two like fractions:
84/20 + 84/20 = 84 + 84/20 = 168/20 - 168/20 simplified gives 42/5
- So, 21/5 + 84/20 = 42/5
In mixed form: 82/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+84/20 21/10+84/20 21/5+84/40 63/5+84/20 21/15+84/20 21/5+84/60 21/25+84/20 21/35+84/20