“２０以内加减法”活动课设计陶青春（南师附小）活动目的：①熟练进行２０以内进位加法和退位减法的计算，形成快速计算的技能。②培养学生的协作精神和竞争意识。活动准备：①把全班分成５个组，每组８人。②印有计算题的练习纸，一人一张。③用小黑板写好每组的接力赛... “Less than 20 addition and subtraction” activity class design Tao Qingchun (South Division attached to small) activities purposes: ① skilled carry-in addition and subtraction subtraction within 20 calculations to form a quick calculation skills. ② cultivate students' sense of cooperation and competition. Activity preparation: ① The whole class is divided into 5 groups, each group of 8 people. ② printed exercises on the calculation of the paper, one for each person. ③ write a small blackboard each relay team ...