Add 90/30 and 15/12
1st number: 3 0/30, 2nd number: 1 3/12
90/30 + 15/12 is 17/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
90/30 = 90 × 2/30 × 2 = 180/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
15/12 = 15 × 5/12 × 5 = 75/60 - Add the two like fractions:
180/60 + 75/60 = 180 + 75/60 = 255/60 - 255/60 simplified gives 17/4
- So, 90/30 + 15/12 = 17/4
In mixed form: 41/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+30/12 90/60+15/12 90/30+15/24 90/30+45/12 90/30+15/36 90/30+75/12 90/30+15/60 90/30+15/84