Add 81/2 and 8/5
1st number: 40 1/2, 2nd number: 1 3/5
81/2 + 8/5 is 421/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 5 is 10
Next, find the equivalent fraction of both fractional numbers with denominator 10 - For the 1st fraction, since 2 × 5 = 10,
81/2 = 81 × 5/2 × 5 = 405/10 - Likewise, for the 2nd fraction, since 5 × 2 = 10,
8/5 = 8 × 2/5 × 2 = 16/10 - Add the two like fractions:
405/10 + 16/10 = 405 + 16/10 = 421/10 - So, 81/2 + 8/5 = 421/10
In mixed form: 421/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/2+16/5 81/4+8/5 81/2+8/10 81/2+24/5 81/6+8/5 81/2+8/15 81/2+40/5 81/10+8/5 81/2+8/25 81/2+56/5 81/14+8/5 81/2+8/35