Add 12/8 and 42/81
1st number: 1 4/8, 2nd number: 42/81
12/8 + 42/81 is 109/54.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
12/8 = 12 × 81/8 × 81 = 972/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
42/81 = 42 × 8/81 × 8 = 336/648 - Add the two like fractions:
972/648 + 336/648 = 972 + 336/648 = 1308/648 - 1308/648 simplified gives 109/54
- So, 12/8 + 42/81 = 109/54
In mixed form: 21/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8+42/81 12/8+84/81 12/16+42/81 36/8+42/81 12/24+42/81 60/8+42/81 12/40+42/81 84/8+42/81 12/56+42/81