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连加连减 及加减混合.

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Presentation on theme: "连加连减 及加减混合."— Presentation transcript:

1 连加连减 及加减混合

2 口算: 5 6 1 8 6 3 9 3 3 2+4= 7-2= 6+2= 5-4= 7-4= 3+3= 3-3= 6+3= 6-3=
6+3= 9 6-3= 3 3-0= 3

3 5 + 1 = 6 6 + 1 = 7

4 5 + 1 + 1 = 7

5 7 - 1 = 6 6 - 2 = 4

6 7 - 1 - 2 = 4

7 平台上有2只鸟, 飞来了3只, 又飞来了1只。 2 3 1 现在有几只鸟? 2 + 3 + 1 = 6 按从左往右的次序算。 5

8 + = 4 3 3 10

9 + = 4 2 1 7

10 平台上有6只鸟, 飞走了2只, 又飞走了1只。 2 1 6 现在有几只鸟? 6 - 2 - 1 = 3 按从左往右的次序算。 4

11 - = 9 4 2 3

12 - = 8 3 1 4

13 4 + 3 = 7 7 - 2 = 5 4 + 3 - 2 = 5

14 4 - 2 = 2 2 + 3 = 5 4 - 2 + 3 = 5

15 + = - 7 2 3 3

16 - = + 5 3 2 6

17 按从左往右的次序算。 5+2+3= 10 7-2-3= 2 7 5 4+1+5= 10 8-3-4= 1 5 5

18 看谁做得快! 8 9 7 9 2 6 1 10-4+2= 2+6+1= 8- 3- 5= 4+2+1= 7- 2+ 4= 6- 3- 1=
7 9 2 6 1 10-4+2= 2+6+1= = 4+2+1= = = = 3+2-4= 6+3- 3=

19 看看、说说、算算:

20 看看、说说、算算:

21 调皮小虎藏起了几? 2 3 =6 9-3-□=3 4 2 8-4-□=0 2+□+3=7

22 调皮小虎藏起了几? 4 2 =3 9-3 + □=8 3 5 8-6 + □=5 2+□-6=1

23 看图,你能写出几个算式? 1 2 4

24 思考:你能写出几个算式?

25 谢谢使用! 制作者:吴毅炯


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