Add 21/45 and 27/12
1st number: 21/45, 2nd number: 2 3/12
21/45 + 27/12 is 163/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
21/45 = 21 × 4/45 × 4 = 84/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
27/12 = 27 × 15/12 × 15 = 405/180 - Add the two like fractions:
84/180 + 405/180 = 84 + 405/180 = 489/180 - 489/180 simplified gives 163/60
- So, 21/45 + 27/12 = 163/60
In mixed form: 243/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+27/12 21/45+54/12 21/90+27/12 21/45+27/24 63/45+27/12 21/45+81/12 21/45+27/36 21/45+27/60 21/45+27/84