Year 7 Interactive Maths - Second Edition

Representation of Decimals on a Number Line

E.g.  To represent 8.4 on a number line, divide the segment between 8 and 9 into ten equal parts.

The arrow is four parts to the right of 8 where it points at 8.4.

Likewise, to represent 8.45 on a number line, divide the segment between 8.4 and 8.5 into ten equal parts.

The arrow is five parts to the right of 8.4 where it points at 8.45.

Similarly, we can represent 8.456 on a number line by dividing the segment between 8.45 and 8.46 into ten equal parts.

The arrow is six parts to the right of 8.45 where it points at 8.456.

Example 5

Write the decimal number that the arrow points at in the following diagrams:

a.

b.

c.

Solution:

a.  24.3

b.  3.005

c.  6.378

Key Term

number line