Okay kiddo, have you ever heard of a jigsaw puzzle? It's kind of like that, but with numbers instead of pictures.
The Slothouber-Graatsma puzzle is a special type of jigsaw puzzle where you have to put together a square or rectangle shape using a set of numbers.
It starts with a big square that is divided into smaller squares. Some of these squares have numbers on them, and these numbers give you clues about how to put the puzzle together.
Each row and column of squares must add up to the same number. Let's say that number is 15. So if one row has the numbers 3, 5, and 7, they add up to 15. Another row might have the numbers 1, 6, and 8, which also add up to 15.
You have to use your math skills to figure out which numbers go where in order to make each row and column add up to the same number.
It's kind of like a math puzzle, and it can be a little tricky, but it's a fun challenge!