The knight in chess always moves the same way - two squares straight, then one to the side.
Run your finger two squares up, down, left or right and then one across. If you land on a numbered square, that is the one.
Other pieces do not block it - the knight jumps right over them.
Example
For parents
What does this exercise practice?
The knight's move practices thinking ahead in space and counting squares carefully in two directions - with no arithmetic at all.
Common pitfalls
Children often move diagonally like a bishop. But the knight always goes straight first and then across.
How to practice at home
Put a knight on a real chessboard and mark every square it reaches in one move with a coin.