Add 45/80 and 18/12
1st number: 45/80, 2nd number: 1 6/12
45/80 + 18/12 is 33/16.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 12 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
45/80 = 45 × 3/80 × 3 = 135/240 - Likewise, for the 2nd fraction, since 12 × 20 = 240,
18/12 = 18 × 20/12 × 20 = 360/240 - Add the two like fractions:
135/240 + 360/240 = 135 + 360/240 = 495/240 - 495/240 simplified gives 33/16
- So, 45/80 + 18/12 = 33/16
In mixed form: 21/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80+18/12 45/80+36/12 45/80+18/24 45/80+54/12 45/80+18/36 45/80+90/12 45/80+18/60 45/80+18/84