Add 30/18 and 90/8
1st number: 1 12/18, 2nd number: 11 2/8
30/18 + 90/8 is 155/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
30/18 = 30 × 4/18 × 4 = 120/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
90/8 = 90 × 9/8 × 9 = 810/72 - Add the two like fractions:
120/72 + 810/72 = 120 + 810/72 = 930/72 - 930/72 simplified gives 155/12
- So, 30/18 + 90/8 = 155/12
In mixed form: 1211/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+90/8 30/36+90/8 30/18+90/16 90/18+90/8 30/54+90/8 30/18+90/24 30/90+90/8 30/18+90/40 30/18+90/56