Add 84/25 and 28/21
1st number: 3 9/25, 2nd number: 1 7/21
84/25 + 28/21 is 352/75.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 25 × 21 = 525,
84/25 = 84 × 21/25 × 21 = 1764/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
28/21 = 28 × 25/21 × 25 = 700/525 - Add the two like fractions:
1764/525 + 700/525 = 1764 + 700/525 = 2464/525 - 2464/525 simplified gives 352/75
- So, 84/25 + 28/21 = 352/75
In mixed form: 452/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/25+56/21 84/50+28/21 84/25+28/42 84/25+84/21 84/75+28/21 84/25+28/63