Add 21/25 and 9/90
21/25 + 9/90 is 47/50.
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,
9/90 = 9 × 5/90 × 5 = 45/450 - Add the two like fractions:
378/450 + 45/450 = 378 + 45/450 = 423/450 - 423/450 simplified gives 47/50
- So, 21/25 + 9/90 = 47/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+9/90 21/25+18/90 21/50+9/90 63/25+9/90 21/25+27/90 21/75+9/90 21/25+45/90 21/25+63/90