Add 7/8 and 90/81
1st number: 7/8, 2nd number: 1 9/81
7/8 + 90/81 is 143/72.
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,
7/8 = 7 × 81/8 × 81 = 567/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
90/81 = 90 × 8/81 × 8 = 720/648 - Add the two like fractions:
567/648 + 720/648 = 567 + 720/648 = 1287/648 - 1287/648 simplified gives 143/72
- So, 7/8 + 90/81 = 143/72
In mixed form: 171/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8+90/81 7/16+90/81 21/8+90/81 7/24+90/81 35/8+90/81 7/40+90/81 49/8+90/81 7/56+90/81