说,“我和我的朋友要分这生日蛋糕。”Draw a line diagonally across the cake, but do not divide the circle in half.
说,“我的朋友认为这是一个公平的方式分享蛋糕。”Ask students whether they think the cake is divided equally. Have students explain their thinking, and talk about how they notice that one piece of the circle is bigger than the other.
开始
给学生一个真实的生日蛋糕的图片。
标签不平等的部分“小”和“大”。
与一个学生讲同样的语言(L1),并对解释为什么L1的蛋糕不是划分相当。
中间
提供句子阻止,“蛋糕不是划分同样因为______。”Have students share thinking with a partner.