Add 15/75 and 21/18
1st number: 15/75, 2nd number: 1 3/18
15/75 + 21/18 is 41/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 18 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
15/75 = 15 × 6/75 × 6 = 90/450 - Likewise, for the 2nd fraction, since 18 × 25 = 450,
21/18 = 21 × 25/18 × 25 = 525/450 - Add the two like fractions:
90/450 + 525/450 = 90 + 525/450 = 615/450 - 615/450 simplified gives 41/30
- So, 15/75 + 21/18 = 41/30
In mixed form: 111/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/75+21/18 15/75+42/18 15/75+21/36 45/75+21/18 15/75+63/18 15/75+21/54 15/75+21/90