吴青两位数乘两位数课件.ppt

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,*,云台小学 吴 青,两位数乘两位数（一）,17,12,1,712,=1,7,10,+,17,2,=1,70+34,=,204,小丁丁：,1,712,=1,7,3,4,=,51 4,=,204,小巧：,1,712,=,20,12,-,3,12,=240-,36,=,204,小亚：,1,712,=,8,12,+9,12,=,96+108,=,204,小胖：,17,13,17,13,1713,=17,10,+,17,3,=170+51,=221,17,10,10,3,17,3,17,13,10,7,1713,=,1,0,13,+,7,13=130+91,=221,1,0,13,7,13,17,13,20,7,1713,=1720-177,=340-,119,=221,1720,177,17,13,20,3,1713,=,2013-313,=260-39,=221,2013,3,13,43,37,=43,30,+,43,7,=1290+301,=1591,用小丁丁的方法试一试：,43,37,31,29,=,31,20,+,31,9,=,620+279,=,899,31,29,1729,=,1720+17(),4773,=,47()+47,(),5367,=,53 53,=,3180+371,=,3551,填空：,70,60+,7,25,25,1,24,24,25,=,2525,-,125,=625-25,=600,已知,:25,25=625,25,25,1,26,25,=2525+125,=625+25,=650,已知,:25,25=625,25,25,1,24,24,26,=2525-125+124,=625-25+24,=600+24,=624,1,已知,:25,25=625,53,=,53,0+,53,=583,34,=,34,0+,34,=374,有趣的计算,53,1,1,1,1,5,3,两头一拉，,8,中间相加。,6211,7111,谢谢!,