Add 21/2 and 81/30
1st number: 10 1/2, 2nd number: 2 21/30
21/2 + 81/30 is 66/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 2 × 15 = 30,
21/2 = 21 × 15/2 × 15 = 315/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
81/30 = 81 × 1/30 × 1 = 81/30 - Add the two like fractions:
315/30 + 81/30 = 315 + 81/30 = 396/30 - 396/30 simplified gives 66/5
- So, 21/2 + 81/30 = 66/5
In mixed form: 131/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+81/30 21/4+81/30 21/2+81/60 63/2+81/30 21/6+81/30 21/2+81/90 21/10+81/30 21/14+81/30