Add 21/40 and 84/9
1st number: 21/40, 2nd number: 9 3/9
21/40 + 84/9 is 1183/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
21/40 = 21 × 9/40 × 9 = 189/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
84/9 = 84 × 40/9 × 40 = 3360/360 - Add the two like fractions:
189/360 + 3360/360 = 189 + 3360/360 = 3549/360 - 3549/360 simplified gives 1183/120
- So, 21/40 + 84/9 = 1183/120
In mixed form: 9103/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+84/9 21/80+84/9 21/40+84/18 63/40+84/9 21/40+84/27 21/40+84/45 21/40+84/63