The addition of natural numbers

Operations with natural numbers I

 

6-a. Add each number of the magic square to the number outside.
  Esta unidad interactiva requiere la máquina virtual de Java J2RE.

In this exercise you have to add each number of the square to the number that is outside.
The results of the empty cells are the numbers below. Take them to their corresponding places.

6-b. Add up each number of the magic square and the number outside.
  Esta unidad interactiva requiere la máquina virtual de Java J2RE.

This exercise is similar to the previous one, but all the cells must be filled.
       
           
  Eduardo Barbero Corral
 
Spanish Ministry of Education. Year 2007
 
 


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