To find the percentage of blue beads on Kiara's necklace, you can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Number of blue beads}}{\text{Total number of beads}} \right) \times 100 \]
In this case, the number of blue beads is 16 and the total number of beads is 20. Plugging in the numbers:
\[ \text{Percentage} = \left( \frac{16}{20} \right) \times 100 \]
First, simplify \( \frac{16}{20} \):
\[ \frac{16}{20} = 0.8 \]
Now, multiply by 100 to convert it to a percentage:
\[ 0.8 \times 100 = 80 \]
Thus, the percentage of beads on Kiara's necklace that are blue is
\[ \boxed{80%} \]