现代素质教育理论表明:在小学数学教学中必须坚持以“思维为核心,训练为主线”的原则。可见数学练习在数学教学中的重要地位。数学练习是一种有目的、有指导、有组织的学习活动,是学生掌握知识、形成技能、发展智力的基本途径之一。因而数学练习必须精心设计与安排,因为学生在完成练习的过程中,不仅能培养良好的思维品质,而且能巩固数学知识,获得思维能力训练,同时更是提高数学教学质量的重要保 The theory of modern quality education shows that in the elementary mathematics teaching, we must adhere to the principle of “thinking as the core and training as the main line ”. Visible math exercises in math teaching an important position. Mathematics practice is a kind of purposeful, directed and organized learning activities. It is one of the basic ways for students to master knowledge, form skills and develop intelligence. Therefore, the math exercises must be carefully designed and arranged, because students can not only cultivate good thinking quality, but also consolidate the knowledge of math and obtain the training of thinking ability while improving the quality of math teaching