This year I took this idea and made it into early finisher/center activities. Some bright colored card stock and a little lamination go a long way!
I got the small containers at the Dollar Tree and the rest is history. So far the kiddos are loving them. The bright colors help, too!!
The goal is to solve for the given sum using the numbers provided in each container. For example, if the container says, "solve for 18" the numbers inside is what they need to get a sum of 18. Each row and column must add up to be 18. Got it? Easy, right? Well, not at first. In order for them to not be overwhelmed, I model, model, model. I teach them the secret to getting it right every time. Place the three biggest numbers in different rows and columns and it makes Magic Squares MUCH easier for them to solve. I also allow them to use a number line or 100s chart, if they need them.
The set I made contains materials to solve for 15, 18, 21, 24, 27, and 30. You can find it here.