资源描述
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,*,12,13,减几,12,13减几,1,挑战,1,2,挑战,2,3,挑战,3,1挑战12挑战23挑战3,祝:,一年级二班的同学,每天开开心心,健健康康,来自:羊村,你能从,12,开始倒着数吗?,12,11,,,10,,,9,,,8,,,7,6,,,5,,,4,,,3,,,2,,,1,,,0,祝:你能从12开始倒着数吗?12,11,10,9,8,76,,你会算吗?,7+,( ),=12,8+,( ),=12,9+,( ),=12,6+,( ),=12,5+,( ),=12,10+,( ),=12,2,3,4,5,6,7,你会算吗?7+( )=128+( )=129+( )=12,比比谁最聪明,11-2=,11-4=,11-6=,11-9=,11-7=,11-8=,11-5=,11-3=,1,、摆小棒,2,、破十法,3,、想加法做减法,9,8,5,2,4,3,6,8,比比谁最聪明11-2=11-7=1、摆小棒94,12,=,8,(只),1,灰太狼了抓走了几只羊?,我原来一共有,12,只羊,但是现在只有,4,只在羊圈里,12= 8(只)1 灰太狼了抓走了几,Diagram,算加法想减法,摆小棒,破十法,倒着数,Diagram算加法想减法摆小棒破十法倒着数,12-4,12-4,10-4=,6+2=,6,8,6,10-4=6+2=686,12-2,8,-2=,12-28-2=,倒着数,11,10,9,8,12,往前面数四个数是:,倒着数11109 812往前面数四个数是:,12-4=,2,10,6,第一步:,10-4=6,第二步:,6+2=8,8,破十法,12-4=2106第一步:第二步:8破十法,想加法做减法,4+8=12,12-4=8,A,B,12-8=4,想加法做减法4+8=1212-4=8AB12-8=4,1,灰太狼了抓走了几只羊?,我原来一共有,12,只羊,但是只有,5,只,1 灰太狼了抓走了几只羊?我原来一共有1,试一试,12-9=,12-6=,试一试12-9=,智,慧,屋,智慧屋,分一分,说一说,12-5=6,12-6=5,分一分,说一说 12-5=612-6=5,12-7=,12-6=,12-3=,12-4=,12-3=,12-8=,12-5=,12-9=,3,6,4,9,8,9,6,5,12-7=12-6=12-3=12-4=12-3=12-8=,12-6=,2,10,4,6,10,7,9,12-3=,2,10,5,7,12-5=,2,算得巧,12-6=21046107912-3=2105712-5=2,12,3=,12,5=,12,9=,12,4=,12,8=,12,6=,12,7=,排一排,9,8,7,6,5,4,3,123=125=129=124=128=126=,今天你学到了什么?,今天你学到了什么?,Thank You !,Thank You !,
展开阅读全文