苏教二级数学下册千以内的进位加法.pptx

小朋友们们，数学课课 就要开始了，你们们 准备备好了吗吗？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 复习旧知 比比谁算得又快又准确。 96 56 4080 7070 320+480= 200+800= 15 120 11 140 8001000 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 探究新知 年级级一二三四五六 本数85143126114203 236 各年级借书情况统计 第七周 你能提出哪些用加法计算的问题？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 1、二年级和四年级一共借书多少本？ 2、一年级和二年级一共借书多少本？ 143+114 85+143 85+126 年级级一二三四五六 本数 85143126 114 203 236 3、一年级和三年级一共借书多少 本？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 143114 1 4 3 1 1 4 752 257（本 ） 1、二年级和四年级一共借书多少本？ 答：二年级和四年级一共借书257本 。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 85143 8 5 1 4 3 8 十位上8加4等于12，怎么办？ 2 1 2 228（本 ） 2、一年级和二年级一共借书多本？ 答：一年级和二年级一共借书228本 。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 85126 8 5 1 2 6 个位上5加6等于11，怎么办？ 1 1 十位上怎么算？ 1 1 2 211（本 ） 3、一年级和三年级一共借书多少本？ 答：一年级和三年级一共借书211本 。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 1 4 3 1 1 4 72 5 8 5 1 4 3 2 2 8 1 8 5 1 2 6 11 2 1 1 不进位加法 进位加法连续进位加法 仔细观察，你发现了什么？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 我们在列竖式计算进位加法的 时候，有哪些注意点？ 注意点： 1、相同数位对齐。 2、从个位算起。 3、个位相加满十，要向十位 进1 ，十位相加满十，要向百 位进1。 3、哪个数位相加满十，要 向它的前一位进1。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 巩固练习 给大树治病： Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 1 3 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 1 2 1 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 1 0 1 9 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 进位加法计算时： 1、相同数位对齐。 2、从个位算起。 3、哪个数位相加满十，要向它 的前一位进1。 这节课我们学习了什么？ 说一说， 你有什么收获？ Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile .Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 算一算： 587+893 Evaluation only