Add 90/72 and 15/81
1st number: 1 18/72, 2nd number: 15/81
90/72 + 15/81 is 155/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 72 × 9 = 648,
90/72 = 90 × 9/72 × 9 = 810/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
15/81 = 15 × 8/81 × 8 = 120/648 - Add the two like fractions:
810/648 + 120/648 = 810 + 120/648 = 930/648 - 930/648 simplified gives 155/108
- So, 90/72 + 15/81 = 155/108
In mixed form: 147/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72+30/81 90/72+45/81 90/72+75/81