Add 21/3 and 18/45
1st number: 7 0/3, 2nd number: 18/45
21/3 + 18/45 is 37/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 3 × 15 = 45,
21/3 = 21 × 15/3 × 15 = 315/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
18/45 = 18 × 1/45 × 1 = 18/45 - Add the two like fractions:
315/45 + 18/45 = 315 + 18/45 = 333/45 - 333/45 simplified gives 37/5
- So, 21/3 + 18/45 = 37/5
In mixed form: 72/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+18/45 21/3+36/45 21/6+18/45 21/3+18/90 63/3+18/45 21/3+54/45 21/9+18/45 21/3+90/45 21/15+18/45