Add 21/25 and 30/18
1st number: 21/25, 2nd number: 1 12/18
21/25 + 30/18 is 188/75.
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,
30/18 = 30 × 25/18 × 25 = 750/450 - Add the two like fractions:
378/450 + 750/450 = 378 + 750/450 = 1128/450 - 1128/450 simplified gives 188/75
- So, 21/25 + 30/18 = 188/75
In mixed form: 238/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+30/18 21/25+60/18 21/50+30/18 21/25+30/36 63/25+30/18 21/25+90/18 21/75+30/18 21/25+30/54 21/25+30/90