Add 21/40 and 80/18
1st number: 21/40, 2nd number: 4 8/18
21/40 + 80/18 is 1789/360.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 18 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 18 × 20 = 360,
80/18 = 80 × 20/18 × 20 = 1600/360 - Add the two like fractions:
189/360 + 1600/360 = 189 + 1600/360 = 1789/360 - So, 21/40 + 80/18 = 1789/360
In mixed form: 4349/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+80/18 21/80+80/18 21/40+80/36 63/40+80/18 21/40+80/54 21/40+80/90