Add 30/90 and 81/80
1st number: 30/90, 2nd number: 1 1/80
30/90 + 81/80 is 323/240.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
30/90 = 30 × 8/90 × 8 = 240/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
81/80 = 81 × 9/80 × 9 = 729/720 - Add the two like fractions:
240/720 + 729/720 = 240 + 729/720 = 969/720 - 969/720 simplified gives 323/240
- So, 30/90 + 81/80 = 323/240
In mixed form: 183/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/90+81/80