Add 84/5 and 21/90
1st number: 16 4/5, 2nd number: 21/90
84/5 + 21/90 is 511/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
84/5 = 84 × 18/5 × 18 = 1512/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
1512/90 + 21/90 = 1512 + 21/90 = 1533/90 - 1533/90 simplified gives 511/30
- So, 84/5 + 21/90 = 511/30
In mixed form: 171/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/5+42/90 84/10+21/90 84/5+63/90 84/15+21/90 84/25+21/90 84/35+21/90