Add 81/10 and 15/20
1st number: 8 1/10, 2nd number: 15/20
81/10 + 15/20 is 177/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 10 × 2 = 20,
81/10 = 81 × 2/10 × 2 = 162/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
15/20 = 15 × 1/20 × 1 = 15/20 - Add the two like fractions:
162/20 + 15/20 = 162 + 15/20 = 177/20 - So, 81/10 + 15/20 = 177/20
In mixed form: 817/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/10+30/20 81/20+15/20 81/10+15/40 81/10+45/20 81/30+15/20 81/10+15/60 81/10+75/20 81/50+15/20 81/70+15/20