苏教版一年级数学下册第一单元《1.10 整理与练习（1）》教学课件

,苏教版小学数学一年级下册,整理与练习（1）,小朋友们，这一单元我们学习的什么内容？,20以内的退位减法。,今天我们来复习20以内的退位减法。,小朋友们，我们可以用什么方法计算20以内的退位减法呢？你能以12-8为例说一说吗？,把8分成2和6，先算12-2=10，再算10-6=4，所以12-8=4。,把12分成2和10，先算10-8=2，再算2+2=4，所以12-8=4。,因为8+4=12，所以12-8=4。,做减法想加法最简便。,1,14本,？本,614,8,146,8,2,128,4,124,8,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,在空格里填上合适的算式。,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,竖着看，减法算式是怎样排列的？,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,减数不变，被减数越大，差越大。,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,横着看，减法算式是怎样排列的？,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,被减数不变，减数越小，差越大。,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,斜着看，你有什么发现？,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,被减数和减数同时增加了1,差不变。,3,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,任意指一道算式，快速说出得数。,4,119,129,149,159,169,189,118,128,138,158,168,178,117,137,147,157,116,126,146,156,125,135,145,114,134,123,112,139,179,127,167,136,115,124,113,128,178,117,137,147,157,116,146,156,125,135,145,114,134,123,148,127,167,136,113,你能说出几组像这样的算式吗？,13-7=6,13-6=7,5,115=,126,137,148,还可以怎样填？,5,168=,157,146,135,还可以怎样填？,6,13-9=15-8=18-9=16-7=16-9=14-7=12-3=14-5=12-5=11-8=15-6=13-4=17-9=11-7=11-2=,看谁算得对又快！,4,7,9,9,7,7,9,9,7,3,9,9,8,4,9,7,想一想，填一填。,合计,8辆,9辆,()辆,有（）辆客车，有（）辆轿车。一共有多少辆？,8+9,17,8,9,17,(1),7,想一想，填一填。,合计,8辆,()辆,17辆,客车和轿车一共有（）辆，其中客车有（）辆。轿车有多少辆？,17-8,9,17,8,9,(2),（1）14713（）,7,1.帮猴子摘桃子：把正确答案圈出来。,6,5,（2）159（）8,2,1.帮猴子