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# 数 学 一 年 级 下 册 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 数 学 一 年 级 下 册' - gillespie-hehir

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3+2= 2+7=

3+5= 5-2=

6-3 = 7-4=

4+3= 9-7=

5+1= 8-2=

5

9

8

3

3

3

2

7

6

6

1、50里面有( )个十;

2、6个十是( ) ;

3、一个数十位上是7，个位上是0，这个数是（ ）;

5

60

70

1

10,20,30。

10,20。

20盆

1、红花有10盆，黄花有20盆，红花和黄花一共有多少盆？

30 + 40 =

70 －40 =

10 + 40 =

50 －40 =

70 －20 =

20 + 50 =

30

70

10

50

70

50

1.

40+20=

60-20=

60

40

2．口算。

30+20＝

40+50＝

60－40＝

3+2＝

4+5＝

6－4＝

50

5

90

9

20

2

3.

40

3

30

70

43

____+____=____

40

____+____=____

+30

-10

+40

40

20

50

80

-20

-50

30

40

+60

-30

+50

-30

-40

50

90

70

20