Add 81/18 and 42/8
1st number: 4 9/18, 2nd number: 5 2/8
81/18 + 42/8 is 39/4.
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,
81/18 = 81 × 4/18 × 4 = 324/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
42/8 = 42 × 9/8 × 9 = 378/72 - Add the two like fractions:
324/72 + 378/72 = 324 + 378/72 = 702/72 - 702/72 simplified gives 39/4
- So, 81/18 + 42/8 = 39/4
In mixed form: 93/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18+84/8 81/36+42/8 81/18+42/16 81/54+42/8 81/18+42/24 81/90+42/8 81/18+42/40 81/18+42/56