学习内容:人教版数学二年级下册101~102页。学习目标:1.在丰富的质量体验中建立克与千克的概念,初步建立1克与1千克质量的感性认识。知道1千克=1000克。2.以身边物体的质量为参照,通过多种活动培养学生对物体质量估一估的意识与能力,能通过掂一掂等方法估计物品的大概质量。学习重难点:重点:建立1克与1千克的质量感知。难点:估计常见物品的质量。学习过程:一、创设情境。引出概念 Learning content: PEP mathematics grade two volumes 101 ~ 102 pages. Learning Objectives: 1. To establish the concept of gram and kilogram in a rich experience of quality, initially establishing perceptual knowledge of 1 gram and 1 kilogram of quality. Know 1 kg = 1000 grams. 2. With the quality of the objects around as the reference, through a variety of activities to develop students’ awareness of the quality of the object and the ability to estimate, by one by one method to estimate the approximate quality of the item. Learning heavy and difficult: Focus: Build 1 gram and 1 kilogram of quality perception. Difficulties: Estimate the quality of common items. Learning process: First, create a situation. Lead out the concept