13乘数末尾有0的乘法.ppt

本周习惯: 每日一言: 课前准备: 认真倾听,学会合作。一个不想蹚过小河的人,自然不想远涉重洋。针越用越明,脑越用越灵。数学课本,补充习题,练习本,铅笔,水笔。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 课前热身 6口算 2 × 3= 2 × 5= 20 × 3= 2 × 50= 200 × 3= 2 × 500= 60 600 10 100 1000 观察第二行和第三行的算式,算式的其中一个乘数末尾都有 0。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 苏教版三年级数学上册 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 学习目标 1、通过口算的方法,探究乘数末尾有 0的乘法的简便计算,能正确计算。 2、掌握简便算法的书写格式。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 探究新知同学们排成 4个方队表演团体操,每个方队 120 人。一共有多少人? 你能列出算式吗? 4× 120 或 120 ×4 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. ②独立口算或列竖式计算。③指名说出方法和结果。 4× 120= () Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 4× 12 = 48 4× 120 = 480 1 2 0 × 4 4 8 0 可以用竖式竖式还可以这样写 8 4 1 2 0 × 40 4×120 =() 我这样算。 480 人答:一共有 480 人。 Evaluation only. Evaluation only. Cr