教学设想:“三角形的内角和”是九年义务教育六年制小学数学教材第八册(人教版)“三角形、平行四边形和梯形”这一单元中的一个内容。通过钻研《标准》和教材,研究学情和学法,我力图通过教学实践达到以下目标:让学生饶有兴趣地参与学习,体验到数学课堂生活的丰富多彩和充实愉悦 Teaching Imagination: “The Inner Corner of the Triangle” is one of the elements of “Triangle, Parallelogram and Trapezoid” in the eighth volume of the nine-year compulsory education six-year primary school mathematics textbook. By studying “standards” and teaching materials, studying the study and learning methods, I try my best to attain the following goals through teaching practice: let students participate with great interest, and experience the richness and joy of math class life