Uses of Plus(+) and Minus(–) Signs

+ and – signs have two uses in arithmetic

  1. As number signs
  2. As arithmetic operation signs

+ and – as Number Signs

As number signs, + and – are used to represent opposites. See one of my previous articles in this blog to read more about negative numbers as opposites.

As number signs, – and + are written just before a number. All numbers except zero are either positive or negative. Continue reading “Uses of Plus(+) and Minus(–) Signs”

Negative Numbers are Opposites

Negative numbers are fundamental and useful mathematical ideas. They may be difficult to understand at first. Problems with negative numbers are common among school math learners. Students must know the basic facts about negative numbers. It is also equally important to practice math problems involving negative numbers.

Notion of opposites is very common to our experience. Word pairs like up and down, forward and backward, increase and decrease etc. are used to express opposites. In math + and – signs are used with numbers to express opposites. Any two exact opposites nullify each other to give a zero sum.

–3 + 3 = 0

–8 + 8 = 0


A number line is a geometric representation of positive numbers and their opposite negative numbers. It begins at zero and extends indefinitely either way. See that negative numbers are only to the left of zero and positive numbers only to the right of it. Continue reading “Negative Numbers are Opposites”