Okay kiddo, do you know what a magic square is? It's a square grid filled with numbers, where each row, column and diagonal adds up to the same number. Well, an antimagic square is a bit like that, but it's more tricky!
Imagine you have a square grid, like a checkerboard. Each square has a number in it, and you want to make sure that no matter how you add up the numbers - sideways, up and down or diagonally - you NEVER get the same answer twice! That's an antimagic square.
It's like a puzzle that you have to figure out. You have to choose the numbers very carefully to make sure they all add up differently. It's kind of like making sure all the pieces of a puzzle fit together just right.
Antimagic squares are really cool because they are rare and challenging to make. Sometimes people use them to make secret codes because it's hard for anyone to guess what numbers are in the square.
So now you know that an antimagic square is a puzzle-like grid with numbers, where the goal is to make sure all the numbers add up differently no matter how you add them up. It's like a tricky puzzle game that can keep you busy for hours!