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1、,二十以內(nèi)退位減法,十 幾 減 九（復(fù)習(xí)課）,9+6=,9+7=,9+3=,15,16,12,9+8=,17,9+4=,13,9+5=,14,9+2=,11,9+（ ）=12,3,開火車,水果店,我買個。,還剩多少個？,13-9=,4,算一算,有十三顆太陽，拿去九顆太陽。還剩幾顆？,13-9=,4,十六只兔子減去九只還剩幾只？,16-9=,7,12-9= （只）,3,15-9=,6,想：9加（ ）得15。,6,17-9=,想：9加（ ）得17。,8,18-9=,9,想：9加（ ）得18。,9,8,想：10-9= 1+5=,想：10-9= 1+7=,想：10-9= 1+7=,11-9=12-9=

2、13-9=14-9=,15-9=16-9=17-9=18-9=19-9=,2,3,4,5,6,7,8,9,10,仔細(xì)觀察，你發(fā)現(xiàn)了什么？,11 9 = 212 9 = 313 9 = 414 9 = 515 9 = 616 9 = 717 9 = 818 9 = 9,仔細(xì)觀察，你發(fā)現(xiàn)了什么？,11 9 = 2,12 9 = 3,13 9 = 4,14 9 = 5,15 9 = 6,16 9 = 7,17 9 = 8,18 9 = 9,得數(shù)只要看十幾的個位是幾，得數(shù)就是比幾多1,19 9 = 10,跳木樁,=,給、或=找個家 。 12-9 4 11-9 11+913-3 13-9 18- 9 9

3、,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,1

4、89,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,189,179,129,119,169,139,8,3,7,5,2,4,6,159,149,179,129,119,169,139,189,13-9,14-9,15-9,勝利,19-9,17-9,12-9,11-9,18-9,20-9,（ ）-9=5,16-9,入口,+ =14,+ =15,=（ ）,=（ ）,=（ ）,=（ ）,+ =18,- =2,7,7,7,7,8,9,9,9,9,7,認(rèn)真想一想,你真棒！,再 見,