Add 80/40 and 21/18
1st number: 2 0/40, 2nd number: 1 3/18
80/40 + 21/18 is 19/6.
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,
80/40 = 80 × 9/40 × 9 = 720/360 - Likewise, for the 2nd fraction, since 18 × 20 = 360,
21/18 = 21 × 20/18 × 20 = 420/360 - Add the two like fractions:
720/360 + 420/360 = 720 + 420/360 = 1140/360 - 1140/360 simplified gives 19/6
- So, 80/40 + 21/18 = 19/6
In mixed form: 31/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/40+42/18 80/40+21/36 80/40+63/18 80/40+21/54 80/40+21/90