Add 81/70 and 15/18
1st number: 1 11/70, 2nd number: 15/18
81/70 + 15/18 is 209/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
15/18 = 15 × 35/18 × 35 = 525/630 - Add the two like fractions:
729/630 + 525/630 = 729 + 525/630 = 1254/630 - 1254/630 simplified gives 209/105
- So, 81/70 + 15/18 = 209/105
In mixed form: 1104/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70+30/18 81/70+15/36 81/70+45/18 81/70+15/54 81/70+75/18 81/70+15/90