If $8$ insects and $2$ creatures together have $10$ heads and each insect has $1$ head, how many heads do $2$ creatures together have?

Given:
Total number of heads = $10$
Number of insects = $8$
Each insect has $1$ head, so total heads belonging to insects:

$$\text{Insects’ Heads}=8\times 1=8$$

Let the total number of heads belonging to the $2$ creatures together be $H$.
According to the problem:

$$\text{Insects’ Heads}+H=\text{Total Heads}$$

$$8+H=10$$

$$H=10-8=2$$

Therefore, the $2$ creatures together have $2$ heads.