Add 21/90 and 21/24
21/90 + 21/24 is 133/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 24 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
21/90 = 21 × 4/90 × 4 = 84/360 - Likewise, for the 2nd fraction, since 24 × 15 = 360,
21/24 = 21 × 15/24 × 15 = 315/360 - Add the two like fractions:
84/360 + 315/360 = 84 + 315/360 = 399/360 - 399/360 simplified gives 133/120
- So, 21/90 + 21/24 = 133/120
In mixed form: 113/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+21/24 21/90+42/24 21/90+21/48 63/90+21/24 21/90+63/24 21/90+21/72