Draw a triangle with three balloons on the right, left, and bottom. To the right of the balloon, cut out 1x1 squares. On the squares, label each with the numbers one through six on them. Instruct the student to move the squares onto the balloons so that each side's sum equals nine. Allow the student time to solve the puzzle. Ensure that the student has correctly solved the puzzle. This game can be modified to work with multiplication, addition, subtraction, or division. This game is a fun way for your students to work on their basic math skills.
KnowledgeBox has several great online resources for practicing identifying triangles. KnowledgeBox has games with sports themes, which can be a fun way for young boys in particular to study. In addition, KnowledgeBox also has other games that help students practice figuring out the sums of all three types of triangles.
The Homeschool Math website has a lot of online resources for parents striving to help their children review math. The website is also well-organized, so you easily find the specific type of review your child needs. The Geometry Games page has sections for shapes and polygons, area and perimeter, angels, solids, and volume, coordinate planes, congruent transformations, circle/pi, constructions, Pythagorean Theorem, general geometry websites, worksheets, books and advanced topics. In each of these sections, there are a series of links with online exercises and games.
Cut the Knot has over a thousand different interactive Math Activities. For Geometry alone, a parent or teacher can find over 500 games to help her students review different topics. The unique feature of Cut the Knot is the variety of the games they offer. Cut the Knot offers puzzles, memory games, probability games, logic games, and a variety of other activities.