文档介绍：万以内数的口算加减法武蔚霞 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 说一说 里面有( )个百,( )个十,( )个一。 2. 5346 里面有( )个千( )个百( )个十, ()个一。 3. 60 里面有( )个十, 840 里面有( )个十。 4. 900 里面有( )个百, 6800 里面有( )个百。 5. 3000 里面有( )个千, 7000 里面有( )个千。 6. 120 里面有( )个十, 3600 里面有( )个百。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 试一试 200+500= 8100+600= 900-600= 3700-200= 3000+4000= 1300+700= 7000-5000= 1400-600= 上面的每组题,你会做吗,试试看!做完后在小组内说说你的算法,选出你组的代表,在全班汇报你们小组的算法。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 练一练快速算一算 150-90= 160-80= 350-80= 1000-600= 80+30= 70+800= 70+50= 2400+900= 500+500= 3000+6000= 970-50= 4000+5000= 1900-700= 700-300= 2000+800= 8000+600= 5400-5000= 600+3400= 3800-3000= 600+900= Evaluation only. Evaluation only. Created with Client Profile .