Add 81/2 and 8/20
1st number: 40 1/2, 2nd number: 8/20
81/2 + 8/20 is 409/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 2 × 10 = 20,
81/2 = 81 × 10/2 × 10 = 810/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
8/20 = 8 × 1/20 × 1 = 8/20 - Add the two like fractions:
810/20 + 8/20 = 810 + 8/20 = 818/20 - 818/20 simplified gives 409/10
- So, 81/2 + 8/20 = 409/10
In mixed form: 409/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/2+16/20 81/4+8/20 81/2+8/40 81/2+24/20 81/6+8/20 81/2+8/60 81/2+40/20 81/10+8/20 81/2+56/20 81/14+8/20