Add 21/80 and 35/18
1st number: 21/80, 2nd number: 1 17/18
21/80 + 35/18 is 1589/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
35/18 = 35 × 40/18 × 40 = 1400/720 - Add the two like fractions:
189/720 + 1400/720 = 189 + 1400/720 = 1589/720 - So, 21/80 + 35/18 = 1589/720
In mixed form: 2149/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+35/18 21/80+70/18 21/80+35/36 63/80+35/18 21/80+35/54 21/80+35/90