Add 81/80 and 18/45
1st number: 1 1/80, 2nd number: 18/45
81/80 + 18/45 is 113/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
81/80 = 81 × 9/80 × 9 = 729/720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,
18/45 = 18 × 16/45 × 16 = 288/720 - Add the two like fractions:
729/720 + 288/720 = 729 + 288/720 = 1017/720 - 1017/720 simplified gives 113/80
- So, 81/80 + 18/45 = 113/80
In mixed form: 133/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80+36/45 81/80+18/90 81/80+54/45 81/80+90/45