Add 15/2 and 81/40
1st number: 7 1/2, 2nd number: 2 1/40
15/2 + 81/40 is 381/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 2 × 20 = 40,
15/2 = 15 × 20/2 × 20 = 300/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
81/40 = 81 × 1/40 × 1 = 81/40 - Add the two like fractions:
300/40 + 81/40 = 300 + 81/40 = 381/40 - So, 15/2 + 81/40 = 381/40
In mixed form: 921/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/2+81/40 15/4+81/40 15/2+81/80 45/2+81/40 15/6+81/40 75/2+81/40 15/10+81/40 15/14+81/40