Ejercicios de cálculo mental - Practica de la suma.

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

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

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

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

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

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

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

2 + 7 + 3 + 7 + 3 = ( + ) + ( + ) + = + + =

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

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

5 + 8 + 5 + 2 + 5 = ( + ) + ( + ) + = + + =

3 + 5 + 2 + 5 + 7 = ( + ) + ( + ) + = + + =

2 + 8 + 9 + 6 + 1 = ( + ) + ( + ) + = + + =

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

5 + 9 + 1 + 5 + 8 = ( + ) + ( + ) + = + + =

5 + 5 + 6 + 2 + 8 = ( + ) + ( + ) + = + + =

7 + 3 + 9 + 8 + 1 = ( + ) + ( + ) + = + + =

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

2 + 5 + 7 + 3 + 5 = ( + ) + ( + ) + = + + =

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

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

1 + 6 + 8 + 4 + 2 = ( + ) + ( + ) + = + + =

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