Even and Odd Numbers Part 1

The number of objects is even if they can be matched in pairs.

The number of objects is odd if they cannot be matched in pairs.

For example: Let's identify if the number of triangles given below is even or odd.

Make pairs of the given triangles.

 

 

Here, we notice that the given triangles make 5 complete pairs.
 

So, the number of given triangles is even.