[活动准备]小九宫格的做法是:先把厚些的纸剪成半厘米宽的纸条,再剪成5厘米长的一条条,共8条。然后用其中的4条粘成正方形,再粘上另外4条,把正方形隔成大小相等的九个小方格(见图)。做大九宫格时,除了每条纸条的长度是7厘米外,其余均与小九宫格相同。[活动步骤]一、认识幻方先请学生做下面的题:分别把每一横行、每一竖行,以及对角线上的三个数加起来。 [Activity preparation] Small Jiugong grid approach is: first thicker paper cut into half a centimeter wide note, and then cut into 5 cm long a total of eight. Then use four of them to form a square, then attach another four to separate the squares into nine small squares of equal size (see photo). Bigger nine squares grid, in addition to the length of each note is 7 cm, the rest are the same with the small Jiugonggong. [Activity Steps] First, recognize magic squares First, ask the students to do the following questions: Add up each row, each vertical row, and the three numbers on the diagonal.