Add 15/90 and 30/20
1st number: 15/90, 2nd number: 1 10/20
15/90 + 30/20 is 5/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
15/90 = 15 × 2/90 × 2 = 30/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
30/20 = 30 × 9/20 × 9 = 270/180 - Add the two like fractions:
30/180 + 270/180 = 30 + 270/180 = 300/180 - 300/180 simplified gives 5/3
- So, 15/90 + 30/20 = 5/3
In mixed form: 12/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/90+30/20 15/90+60/20 15/90+30/40 45/90+30/20 15/90+90/20 15/90+30/60 75/90+30/20