A colleague of mine found this website http://www.theproblemsite.com/math_games.asp and used the Subtraction Triangles in our afterschool class for “gifted and talented” Grade 2 and 3 children. She made a example and cut out numbers for the children to put together also. The kids (28 boys and 2 girls) LOVED the challenge! See what you think…..
More great ideas!!