一年级数学下册第2单元《20以内的退位减法》2.2《十几减8》习题课件新人教版.ppt

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十几减8,1. 用你喜欢的方法计算。,(选题源于教材P13第3题),2,108 = 138 = 168 = 118 = 148 = 178 = 1218 = 158 = 188 =,5,8,3,6,9,4,7,10,2.,(选题源于教材P15第1题),(选题源于教材P15第2题),3. 移动 ,从卡片上的数里减去它。,108 = 2 138 = 5 168 = 8 98 = 1 118 = 3 178 = 9 128 = 4 148 = 6 188 = 10 158 = 7,1.圈一圈,填一填。 (1),知识点,十几减8的多种算法,158,7,圈一圈略,5,7,7,7,2,5,7,(2),148,6,2.算一算,比一比。,13,58 138,83 118,89 178,5,11,3,17,9,3.1483 1685 1382 1283 1182 1788,易错点,辨析:两步计算时容易出错。,9,11,7,1,5,17,4.在 里填上“”、“”或“”。 128 4 148 6 178 8,通过多种形式的练习提高计算能力,5.依次从下面的数中减去8,你发现了什么?,我发现:十几减8的差就等于_。,3,4,5,6,7,8,9,10,被减数个位上的数加2,

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