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Ejercicios de clculo mental - Practica de la suma.

Suma de dos numeros menores de 10. Completa los cuadros en blanco.

8 + 1 = 7 + = 9

8 + 6 = 3 + = 11

7 + 7 = 3 + = 7

3 + 3 = 6 + = 7

5 + 2 = 4 + = 5

4 + 8 = 6 + = 15

4 + 6 = 7 + = 15

5 + 6 = 9 + = 11

8 + 8 = 6 + = 11

6 + 5 = + + +

9 + 5 = = = =

+ =

1 + = 8 + + +

+ 5 = 14 = = =

+ =

+ 8 6 3 5 13 9 7 1 5

6

1

2 2

7

1 2

3

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3 + 5 = 3 + = 12

9 + 7 = 8 + = 17

9 + 7 = 8 + = 11

2 + 7 = 4 + = 8

2 + 2 = 1 + = 8

8 + 7 = 1 + = 9

7 + 1 = 4 + = 13

8 + 8 = 4 + = 7

1 + 5 = 4 + = 8

9 + 5 = 8 + = 16

4 + 1 = 5 + = 8

1 + 5 = 7 + = 13

7 + 6 = 2 + = 9

1 + 3 = 1 + = 2

8 + 5 = 7 + = 13

5 + 6 = 2 + = 3

5 + 9 = 6 + = 7

3 + 8 = 7 + = 13

2 + 9 = 8 + = 12

2 + 2 = 8 + = 14



Suma de dos numeros menores de 100. Realiza como en el ejemplo.

90 + 17 =90 + 10 = 1 0 0

0 + 7 = 71 0 7

36 + 82 = 58 + 76 =

26 + 42 = 64 + 26 =

46 + 98 = 93 + 29 =

10 + 48 = 26 + 15 =

62 + 16 = 81 + 13 =




Suma de numeros acabados en 9 en 1. Realiza como en los ejemplos.

29 + 29 =29 + 30 = 5 9

-15 8

29 + 21 =29 + 20 = 4 9

+15 0

27 + 79 = 21 + 81 =

55 + 19 = 27 + 51 =

51 + 29 = 41 + 41 =

65 + 79 = 72 + 41 =

63 + 19 = 75 + 21 =




Suma de dos numeros consecutivos y de dos nmeros que se diferencian en uno menores de 100. Completa los cuadros en blanco.

Para sumar dos nmeros consecutivos basta sumar uno al doble del menor.

Para sumar dos nmeros que se diferencian en dos basta calcular el doble del intermedio.

7+8=7+7+1 12+13=12+12+1 7+9=8+8 12+14=13+13

13 + 14 = + + = 4 + 6 = + =

60 + 61 = + + = 80 + 82 = + =

17 + 18 = + + = 24 + 26 = + =

69 + 70 = + + = 48 + 50 = + =

78 + 79 = + + = 67 + 69 = + =

52 + 53 = + + = 79 + 81 = + =

15 + 16 = + + = 86 + 88 = + =

15 + 16 = + + = 18 + 20 = + =

65 + 66 = + + = 52 + 54 = + =

5 + 6 = + + = 12 + 14 = + =

90 + 91 = + + = 77 + 79 = + =

43 + 44 = + + = 75 + 77 = + =

54 + 55 = + + = 43 + 45 = + =

37 + 38 = + + = 65 + 67 = + =

71 + 72 = + + = 74 + 76 = + =

41 + 42 = + + = 9 + 11 = + =

73 + 74 = + + = 86 + 88 = + =

34 + 35 = + + = 29 + 31 = + =

72 + 73 = + + = 87 + 89 = + =

41 + 42 = + + = 28 + 30 = + =



Suma agrupando los nmeros que sumen 10 como en el ejemplo.

9 + 4 + 5 + 1 + 6 = (9+1) + (4+6) + 5 = 10 + 10 + 5 = 25

9 + 8 + 2 + 1 + 8 = ( + ) + ( + ) + = + + =

5 + 3 + 9 + 1 + 5 = ( + ) + ( + ) + = + + =

7 + 5 + 5 + 3 + 8 = ( + ) + ( + ) + = + + =

3 + 1 + 9 + 5 + 7 = ( + ) + ( + ) + = + + =

3 + 9 + 7 + 4 + 1 = ( + ) + ( + ) + = + + =

1 + 9 + 9 + 9 + 1 = ( + ) + ( + ) + = + + =

4 + 8 + 2 + 6 + 4 = ( + ) + ( + ) + = + + =

2 + 4 + 8 + 8 + 2 = ( + ) + ( + ) + = + + =

5 + 5 + 4 + 1 + 6 = ( + ) + ( + ) + = + + =

2 + 8 + 2 + 8 + 7 = ( + ) + ( + ) + = + + =

3 + 5 + 5 + 3 + 7 = ( + ) + ( + ) + = + + =

8 + 6 + 2 + 2 + 8 = ( + ) + ( + ) + = + + =

4 + 5 + 3 + 6 + 7 = ( + ) + ( + ) + = + + =

2 + 8 + 8 + 2 + 9 = ( + ) + ( + ) + = + + =

9 + 6 + 1 + 3 + 7 = ( + ) + ( + ) + = + + =

9 + 1 + 6 + 6 + 4 = ( + ) + ( + ) + = + + =

6 + 3 + 6 + 4 + 7 = ( + ) + ( + ) + = + + =

1 + 9 + 5 + 5 + 3 = ( + ) + ( + ) + = + + =

8 + 2 + 3 + 7 + 6 = ( + ) + ( + ) + = + + =

5 + 5 + 5 + 2 + 5 = ( + ) + ( + ) + = + + =



Completa los ladrillos. Cada ladrillo superior se obtiene sumando los dos que tiene debajo.

4 6 5 11

9 8 8 13

4 12 28 7

3 11 27 14

6 11 22 10

13 16 23 8

22 5 20 15

7 19 20 14

19 5 1 8

14 5 19 7





18 + 45 = 78 + = 92

14 + 57 = 28 + = 76

55 + 87 = 87 + = 108

48 + 56 = 74 + = 166

47 + 39 = 47 + = 60

94 + 42 = 61 + = 84

22 + 73 = 69 + = 112

45 + 20 = 44 + = 115

31 + 54 = 93 + = 163

34 + 38 =

+ + +

48 + 43 =

= = =

+ =

48 + = 91

+ + +

+ 43 = 91

= = =

+ =

+ 80 37 91 51 26

61

10

88

75

82

110

66

15 28

146

69 24

25



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