We try and practice addition in several different ways around the house. I much prefer the traditional Montessori materials. However, due to our budget, it is just not possible, so I make and create from things around the house.
I created red and blue rods for one of our addition practices. I also made number cards and a "=" and "=" sign for Little Angel to practice adding in mathematical sentence form. For a free download of the red and blue number rods, visit my website www.montessoriforlearning.com