Imagine the number line you have seen in the applet before.[br][br]We call the numbers to the left of zero [b]negative[/b] numbers and attach a "[b]-[/b]" sign to them. The numbers to the right of zero are then the [b]positive[/b] numbers. Those are the numbers, that you already know and which you use e.g. for counting. We give them a "[b]+[/b]" sign, but mostly we will not write down that sign to keep things shorter.[br][br]The set of negative and positive numbers are called the [b]Integers[/b].[br][br]The distance to zero of an integer is called [b]absolute value[/b] and it is always positive. (because distances are always positive)[br]For example: The absolute value of [i]4[/i] is [i]4[/i] and the absolute value of [i]-3[/i] is [i]3[/i].