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1、笔算乘法进位,五两位数乘两位数（第三课时）,围棋棋盘由纵横各19条线组成。,你能提出什么问题。,新知学习,1919=,19202020=400大约400个,2019=380380-19=361,1,9,1,9,1,7,9,1,1,6,3,8,1,361,练一练,2334=,5413=,3927=,1728=,2,3,3,4,5,4,1,3,3,9,2,7,1,7,2,8,2,9,9,6,2,8,7,2,6,4,5,2,0,7,3,7,8,7,3,5,0,6,3,4,3,6,7,4,782,702,1053,476,1,2,1,1,通过今天的学习，你学会笔算乘法了吗？把你的收获和大家说一说吧！,
2、练一练,练 习 十 六,1.,2436=,2714=,1562=,3625=,2,4,3,6,2,7,1,4,1,5,6,2,3,6,2,5,4,4,2,7,4,6,8,8,0,7,2,6,7,3,0,3,0,9,0,3,9,0,8,2,7,0,0,9,864,376,930,900,1,1,1,练一练,练 习 十 六,1.,6352=,4228=,4831=,4534=,6,3,5,2,4,2,2,8,4,8,3,1,4,5,3,4,6,2,5,1,6,7,2,6,3,4,8,6,7,1,8,4,4,4,8,8,4,0,8,5,3,0,3,5,3276,1176,1488,1530,1,3,3,3,1,1,1,1,1,1,
