The addition of integers
Operations with integers I
 
1. The addition of integers.

When adding, we join two values into one.
As we are used to work with natural numbers we are prone to expect the outcome to be a number larger than the addends, but this isn't the case with integers because it depends on the signs of the addends.
Esta unidad interactiva requiere la máquina virtual de Java J2RE.

In Maths we must always look for the most simple solution. That which is unnecessary hinders us and, if possible, we have to eliminate it by simplifying the expression.
We only use the positive sign of a number when it is indispensable. Thus, when adding integers, we integrate the number signs with the addition sign, until you get something similar to a series of additions and subtractions.

Solve these operations by distributing the numbers below to the corresponding circles.

When you click on the triangles below you can see the step in between to solve them, that is to dispense with brackets and unnecessary signs.

When you click on the Init button new sums appear.
Esta unidad interactiva requiere la máquina virtual de Java J2RE.

When you click on the Init button new sums appear.

       
           
  Eduardo Barbero Corral
 
Spanish Ministry of Education. Year 2007
 
 


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