A group of children can be classified according to eye color (blue, brown, green), gender (male, female) and hobby (collecting stamps, collecting baseball cards, collecting shells, collecting stickers). How many possible different classifications are there?

3*2*4 choices.

To determine the number of possible different classifications, you need to multiply the number of choices for each category.

In this case, you have three categories: eye color (blue, brown, green), gender (male, female), and hobby (collecting stamps, collecting baseball cards, collecting shells, collecting stickers).

For the eye color category, there are 3 choices: blue, brown, and green.

For the gender category, there are 2 choices: male and female.

For the hobby category, there are 4 choices: collecting stamps, collecting baseball cards, collecting shells, and collecting stickers.

To find the total number of possible different classifications, you multiply the number of choices for each category:
3 (choices for eye color) * 2 (choices for gender) * 4 (choices for hobby) = 24

Therefore, there are 24 possible different classifications.