 ## Activity 5

When dividing by 1000, move the digits 3 places to the right (past the decimal point). Divide 202.15 by 1000. What is 202.15 metres in kilometres?

### Author(s): The Open UniversityLicense informationRelated contentCopyright Â© 2016 The Open University

Quantities can be smaller than one (such as 0.5 kg) or take values between whole numbers (such as a height of 1.65 metres). Numbers smaller than one are expressed as decimals or as fractions. Decimals are often easier to work with (especially when using a calculator). Decimals are explained in this section, and fractions following that (Section 1.7).

Decimals can be indicated on the number line in between whole numbers. 0.5 and 1.65 are indicated on the figure below.

Author(s): The Open University

It is often useful in mathematics to think of numbers stretched out along the imaginary number line. The diagram below shows part of the number line.

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