Add 21/40 and 36/18
1st number: 21/40, 2nd number: 2 0/18
21/40 + 36/18 is 101/40.
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,
36/18 = 36 × 20/18 × 20 = 720/360 - Add the two like fractions:
189/360 + 720/360 = 189 + 720/360 = 909/360 - 909/360 simplified gives 101/40
- So, 21/40 + 36/18 = 101/40
In mixed form: 221/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+36/18 21/40+72/18 21/80+36/18 63/40+36/18 21/40+36/54 21/40+36/90