A number line is a line in which real numbers can be placed, according to their value. Each points on a number line corresponds to a real number, and each real number has a unique point that corresponds to it. For example, the number 1.5 (1 1/2) corresponds with the point on a numberline that is halfway between one and two.


A real number is any element of the set R, which is the union of the set of rational numbers and the set of irrational numbers. In mathematical expressions, unknown or unspecified real numbers are usually represented by lowercase italic letters u through z. The set R gives rise to other sets such as the set of imaginary numbers and the set of complex numbers


Reading a Number Line



• A number line shows the numbers in order.

• The points on a numberline are called coordinates.

• The zero point is called the origin.

• The numbers to the right of the origin are positive numbers.

• The numbers to the left of the origin are negative numbers.

• A number line has arrows because the numbers keep going forever.

• You can use the number line to practice the addition and subtraction.


Please browse expert math related websites for more help on Writing Decimals in Words.



Addition and substraction on number line


addition using number line 5 + 3 = 8

substraction using number line 6 - 5 = 1