INTEGERS STARTING

First of all we'll watch a video to remember that we use negative numbers in the real life.
integers in the real world

N	Z
{0, 1, 2, .........................}	{.......-2, -1, 0, 1, 2,.......}

Do you know what integers are? What are integers

Some useful lessons: 
hippocampus.org/mjoseam&playlist.Integers