苏教版三年级上册数学1.1《口算和估算》课件（江苏省级优课）.pptx

义务教育教科书 苏教版小学数学三年级上册,整十整百数乘一位数,整十整百数乘一位数,5,3,1分米,1,3,4,5,6,7,8,9,10,2,一个一个地数,十个十个地数,一百一百地数,每盘20个,一共多少个？,每盘20个,一共多少个？,20202060,每盘20个,一共多少个？,203,60,每盘20个,一共多少个？,想：23 6,203,60,9,试一试,303,460,0,24,0,2003,00,6,试一试,802=,8002=,8216,?,?,160,1600,507=,5007=,5735,?,?,350,3500,2003=600,203=60,236,照样子算一算,403=120,4003=,4312,?,?,1200,603=,6003=1800,6318,?,?,180,5735,29,39,59,69,79,89,99,28,27,26,25,24,23,22,38,37,36,35,34,33,48,47,46,45,44,58,57,56,55,68,67,66,78,77,88,49,19,18,17,16,15,14,13,12,11,2003=600,6006=,4007=,203=60,23=6,407=,47=,606=,66=,28,280,2800,36,360,3600,4700=,470=,280,2800,算一算,206 =,3800 =,820 =,704 =,5002 =,9400 =,970 =,6007 =,120,2400,280,1000,160,3600,630,4200,19,29,39,49,59,69,79,89,18,17,16,15,14,13,12,11,28,27,26,24,23,22,38,37,36,35,34,33,48,47,46,44,57,55,68,78,77,88,25,25,66,67,编一编,205=100,2005=1000,45,56,58,99,250=100,2500=1000,25=10,2400,4200,3600,1000,280,120,630,160,比一比,206 =,3800 =,820 =,704 =,6007 =,9400 =,970 =,5002 =,40,50,四十几,如果买4箱西瓜，200元够不够？,如果买4箱西瓜，200元够不够？,如果买4箱西瓜，200元够不够？,50元,48元,50元,48元,50元,48元,50元,48元,够,不够,300元够买5箱哈密瓜吗？,够,不够,60,5 = 300(元),62,60,60,60,60,60,62,625, 300(元),老师买了3张同样价格的火车票，付了1000元，还找回了一些零钱。,1000元,400元,400元,400元,1000元,200元,200元,200元,老师买了3张同样价格的火车票，付了1000元，还找回了一些零钱。,下,300元,300元,300元,1000元,300元,300元,300元,1000元,老师买了3张同样价格的火车票，付了1000元，还找回了一些零钱。,1000元,200元,200元,200元,203,2003,2300,20003,230,谢谢