Add 18/15 and 32/21
1st number: 1 3/15, 2nd number: 1 11/21
18/15 + 32/21 is 286/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
18/15 = 18 × 7/15 × 7 = 126/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
32/21 = 32 × 5/21 × 5 = 160/105 - Add the two like fractions:
126/105 + 160/105 = 126 + 160/105 = 286/105 - So, 18/15 + 32/21 = 286/105
In mixed form: 276/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+32/21 18/15+64/21 18/30+32/21 18/15+32/42 54/15+32/21 18/15+96/21 18/45+32/21 18/15+32/63 90/15+32/21 18/75+32/21