Add 21/25 and 20/90
21/25 + 20/90 is 239/225.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 90 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 90 × 5 = 450,
20/90 = 20 × 5/90 × 5 = 100/450 - Add the two like fractions:
378/450 + 100/450 = 378 + 100/450 = 478/450 - 478/450 simplified gives 239/225
- So, 21/25 + 20/90 = 239/225
In mixed form: 114/225
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+20/90 21/25+40/90 21/50+20/90 63/25+20/90 21/25+60/90 21/75+20/90