Or download our app "Guided Lessons by Education.com" on your device's app store.
Get your fifth grader involved in some geometry detective work! With a little practice, it's easy to find the missing base in a series of triangles. He'll be given the area and height of each triangle, and then need to modify the formula in order to solve. He'll boost his understanding of geometry, along with his multiplication and division skills.
For further practice, check out thr rest of the triangle series.