Add 21/25 and 84/18
1st number: 21/25, 2nd number: 4 12/18
21/25 + 84/18 is 413/75.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 18 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 25 × 18 = 450,
21/25 = 21 × 18/25 × 18 = 378/450 - Likewise, for the 2nd fraction, since 18 × 25 = 450,
84/18 = 84 × 25/18 × 25 = 2100/450 - Add the two like fractions:
378/450 + 2100/450 = 378 + 2100/450 = 2478/450 - 2478/450 simplified gives 413/75
- So, 21/25 + 84/18 = 413/75
In mixed form: 538/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+84/18 21/50+84/18 21/25+84/36 63/25+84/18 21/75+84/18 21/25+84/54 21/25+84/90