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Автор: Костенко Татьяна Александровна PowerPoint PPT Presentation


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Урок математики во 2 классе по теме «Уравнение». Автор: Костенко Татьяна Александровна учитель начальных классов МАОУ «Средняя школа №3 имени А.С.Пушкина». Математика нужна! Математика важна! В жизни пригодится! Изучая математику,

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Автор: Костенко Татьяна Александровна

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2

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3 ..


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  • ,

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6451517

?

315 = 189

584 = 689

1032 + = 3275


6451517

.

.

: + 4 = 12

,

!


6451517

25

37

38

24

12

20

12

80

20

20 8 =

12

20

90 70 =

18 + 7 =

25

20 + 17 =

37

54 30 =

24

50 + 30 =

80

70 32 =

38

17

25

20

90

80

38

30

37

16

12

34

24


6451517

:

:

  • ,


6451517

+ 4 = 12

=

-

,

...

...


6451517

?

?

+ 9 = 16

17 + d = 20

?

?

a - 8 = 7

30 - c = 10


6451517

?

1.

+ 9 = 16

...

= 16 - 9

2.

...

= 7

3.

...

4.

...

,

7 + 9 = 16

...

5.

...

16 = 16


6451517

1

2

3

4


6451517

1

1.

= 50 - 23

= 27

+ 23 = 50

27 + 23 = 50

50 = 50

2.

30 = 10

= 30 + 10

= 40

40 30 = 10

10 = 10


6451517

1. , .

1

2

3

4

5

1

2

3

4

5

1

2

3

4

5

= 50 - 23

= 27

+ 23 = 50

1

2

3

4

5

1

2

3

4

5

50 = 50

27 + 23 = 50

2. , .

30 = 10

= 30 10

= 20

30 20 = 10

10 = 10

30 = 10

= 10 + 30

= 40

40 30 = 10

10 = 10


6451517

2

1.

= 20 +17

20 = 20

37 17 =20

17 =20

= 37

2.

20 + = 35

= 20 + 35

= 55

55 20 = 35

35 = 35


6451517

1. , .

1

2

3

4

5

1

2

3

4

5

1

2

3

4

5

= 20 + 17

20 = 20

37 17 = 20

1

2

3

4

5

1

2

3

4

5

17 = 20

= 37

2. , .

20 + = 35

= 35 20

= 15

20 + 15 = 35

35 = 35

20 + = 35

= 20 + 35

= 55

55 20 = 35

35 = 35


6451517

3

1.

= 20

70 = 50

50 = 50

= 70 - 50

70 - 20 = 50

2.

+ 11= 50

= 50 + 11

= 61

61 11 = 50

50 = 50


6451517

1. , .

1

2

3

4

5

1

2

3

4

5

1

2

3

4

5

= 20

70 =50

50 = 50

1

2

3

4

5

1

2

3

4

5

= 70 - 50

70 - 20 = 50

2. , .

+ 11 = 50

= 50 11

= 39

39 + 11 = 50

50 = 50

+ 11 = 50

= 50 + 11

= 60

61 11 = 50

50 = 50


6451517

4

1.

d = 65 - 35

65 = 65

35 + 30 = 65

d = 30

35 + d = 65

2.

18 = 30

= 30 - 18

= 12

18 + 12 = 30

30 = 30


6451517

1. , .

1

2

3

4

5

1

2

3

4

5

1

2

3

4

5

d = 65 - 35

65 = 65

35 + 30 = 65

1

2

3

4

5

1

2

3

4

5

d = 30

35 + d = 65

2. , .

18 = 30

= 30 + 18

= 48

48 18 = 30

30 = 30

18 = 30

= 30 - 18

= 12

18 + 12 = 30

30 = 30


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1. ...

, , .

) , , .

) , .


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2. ?

) + 20 < 30

) 15 + 3 = 18

) 70 = 20


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2. ?

) 37 d

) 85 a = 35

) x + 23 = 30


6451517

4. ?

) 37 + a = 50

) 15 = 9

) b 20 = 5


6451517

5. ?

) + 8 = 15

) 16 = 9

) 7 = 10


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.

.

, .


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:

()...

...

...


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1) . 80 2

2) .


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