The addition of integers
Operations with integers I
 
10. Complete this seven-pointed magic star.
 

The sum of the three numbers of each segment = 0

To complete the star you may put the numbers on the segments where only one is needed.

In each segment the absolute value of the addition of positives is equal to the absolute value of the addition of negatives. A number is the opposite of the addition of the other two.

There are 168 different seven-pointed stars. Every time you click on Init, a random new star will appear.
       
           
  Eduardo Barbero Corral
 
Spanish Ministry of Education. Year 2007
 
 


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