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Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,11/7/2009,#,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,十几减8、7,苏教版一年级数学下册,教学目标,1在十几减九的基础上学习计算十几减八、七。,2运用多种方法解题,培养同学们思维的灵活性。,3初步渗透被减数不变,减数越大,结果越小。,口算,8+7=,8+5=,7+6=,7+4=,8+9=,7+9=,7+7=,4+8=,6+7=,7+3=,8+8=,6+8=,口算,13-9=?,10-9=1,1+3=4,13-3=10,10-6=4,9+4=13,13-9=4,计算15-8=?,计算,15-8=?,15-5=10,10-3=7,10-8=2,2+5=7,8+7=15,15-8=7,7,13-8=?,10-7=,11-7=,12-7=,13-7=,14-8=,15-8=,16-8=,17-8=,3,4,5,6,6,7,8,9,13-7=?,13-8=?,结果相差几?,为什么只相差1?,13-7=6,13-8=5,12,14,16,-8,=,13,15,17,-7,=,在,填上适当的数,4,6,8,6,8,10,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,7,2,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,7,2,7,5,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,7,2,7,5,7,6,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,7,2,7,5,7,6,7,9,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,7,2,7,5,7,6,7,9,7,1,移动,7,,从卡片上的数里减去它,11,14,10,15,9,12,13,16,8,17,4,7,7,7,7,3,7,8,7,2,7,5,7,6,7,9,7,1,7,10,连线,7+6,14-7,12-8,15-7,7,13,8,4,再见,内容总结,十几减8、7。1在十几减九的基础上学习计算十几减八、七。3初步渗透被减数不变,减数越大,结果越小。8+8=。再见,
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