Add 45/80 and 21/18
1st number: 45/80, 2nd number: 1 3/18
45/80 + 21/18 is 83/48.
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,
45/80 = 45 × 9/80 × 9 = 405/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
21/18 = 21 × 40/18 × 40 = 840/720 - Add the two like fractions:
405/720 + 840/720 = 405 + 840/720 = 1245/720 - 1245/720 simplified gives 83/48
- So, 45/80 + 21/18 = 83/48
In mixed form: 135/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80+21/18 45/80+42/18 45/80+21/36 45/80+63/18 45/80+21/54 45/80+21/90