Add 21/5 and 25/90
1st number: 4 1/5, 2nd number: 25/90
21/5 + 25/90 is 403/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
21/5 = 21 × 18/5 × 18 = 378/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
25/90 = 25 × 1/90 × 1 = 25/90 - Add the two like fractions:
378/90 + 25/90 = 378 + 25/90 = 403/90 - So, 21/5 + 25/90 = 403/90
In mixed form: 443/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+25/90 21/5+50/90 21/10+25/90 63/5+25/90 21/5+75/90 21/15+25/90 21/25+25/90 21/35+25/90