三年级数学下册第3章美丽的街景—两位数乘以两位数第1课时两位数乘两位数课件青岛版六三制.ppt

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1、我们游览了美丽都市的街景。 你发现了哪些数学信息呢?,1、一共有多少个红气球? 2、一共有多少个蓝气球?,根据数学信息,你能提出哪些问题呢?,合作探索,1、一共有多少个红气球?,3610,360(个),合作探索,3610 = ( ),小芳想:,因为: 361= 36,所以: 3610 = 360,360,小亮想:,所以: 300+60 =360,因为: 3010= 300610=60,1、一共有多少个红气球?,合作探索,2、一共有多少个蓝气球?,30 20=( ),小刚想:,因为: 302 = 60,所以: 3020=600,小红想:,因为:3010 = 300,所以:3002 =600,60

2、0,小兰想:,小强想:,因为:3010 = 300,因为:3020= 302个十=60个十 =600,所以:300+300=600,所以: 3020=600,合作探索,26=206=2006= 20006=,45=405=4005= 40005=,33=303=3003= 30003=,20,200,2000,20000,12,120,1200,12000,9,90,900,9000,算一算。,口算,比比看,谁算得又对又快。,104,106,108,204,406,608,3004,5006,7108,40,60,80,80,240,480,1200,3000,5680,这节课我学会了什么?快来说一说吧!,课本第24页自主练习第4,5,6题。,xx小学 x年级x班,xxx,

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