Find the perimeter

[source]

Moving the Knight

Can you pass the knight through all squares in the chessboard?
As you might know the knight moves in L shape. 
Here is an example of how the knight moves if you are unfamiliar. If you happen to start from the blue square, your next move can be the orange square and the pink one next.

I have seen that this question has been solved on the Internet already. Here is a good explanation for the solution.

Social Distance

 

[hint]

Root Problem

 

Arithmetic Puzzle

Missing Box

What should be written instead of the question mark?

Next arrow

Logic Puzzle

How many cubes?

How many small cubes are needed to complete the given figure into a cube?

Thinking Out of the Box?? 🤔 📦

Hint: As an extra step, search 

• Boolean algebra, 
• Gestalt psychology and 
• the next one:

mother + father = mother + father + child

Women Mathematicians Posters

[resource and more]

Transforming functions

 

Which is larger?

Getting 7777

Flag Colors

Migrating Cows

[source]

Power of power in the root