Add 28/12 and 90/45
1st number: 2 4/12, 2nd number: 2 0/45
28/12 + 90/45 is 13/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
28/12 = 28 × 15/12 × 15 = 420/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
90/45 = 90 × 4/45 × 4 = 360/180 - Add the two like fractions:
420/180 + 360/180 = 420 + 360/180 = 780/180 - 780/180 simplified gives 13/3
- So, 28/12 + 90/45 = 13/3
In mixed form: 41/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12+90/45 28/24+90/45 84/12+90/45 28/36+90/45 28/60+90/45 28/84+90/45