Add 84/90 and 21/12
1st number: 84/90, 2nd number: 1 9/12
84/90 + 21/12 is 161/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
84/90 = 84 × 2/90 × 2 = 168/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
21/12 = 21 × 15/12 × 15 = 315/180 - Add the two like fractions:
168/180 + 315/180 = 168 + 315/180 = 483/180 - 483/180 simplified gives 161/60
- So, 84/90 + 21/12 = 161/60
In mixed form: 241/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+42/12 84/90+21/24 84/90+63/12 84/90+21/36 84/90+21/60 84/90+21/84