Add 84/9 and 21/20
1st number: 9 3/9, 2nd number: 1 1/20
84/9 + 21/20 is 623/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
84/9 = 84 × 20/9 × 20 = 1680/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
21/20 = 21 × 9/20 × 9 = 189/180 - Add the two like fractions:
1680/180 + 189/180 = 1680 + 189/180 = 1869/180 - 1869/180 simplified gives 623/60
- So, 84/9 + 21/20 = 623/60
In mixed form: 1023/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/9+42/20 84/18+21/20 84/9+21/40 84/9+63/20 84/27+21/20 84/9+21/60 84/45+21/20 84/63+21/20