Topics
6. Decimals
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Australia
Year 4

6.02 Read and write numbers with decimals

Lesson
Practice
Lesson

Are you ready?

Let's review how to  write a number in words  .

Examples

Example 1

Choose the written form for the number 90\,528.

A
ninety thousand, five hundred and twenty eight
B
ninety thousand and fifty two
C
ninety thousand, two hundred and fifty eight
Worked Solution
Create a strategy

Use a place value table.

Apply the idea

If we put the number in a place value table we get the following:

Ten thousandsThousandsHundredsTensUnits
90528

By saying this out loud, it is ninety thousand, five hundred and twenty eight. So the correct answer is option A.

Idea summary

We can use a place value table to write a number in words.

Describe parts of a whole

This video looks at the representations of numbers as words and symbols for numbers that include tenths and hundredths.

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Examples

Example 2

How do we write the number 0.65 in words?

A
sixty five thousandths
B
sixty five hundredths
C
sixty five tenths
Worked Solution
Create a strategy

Use a place value table.

Apply the idea

To put it in a place value table, put the 6 in the tenths column, 5 in the hundredths column and use zeros for place holders:

Units.TenthsHundredths
0\text{.}65

So we have 6 in the tenths place and 5 in the hundredths place. Altogether, we have sixty five hundredths. So the correct answer is option B.

Idea summary

When converting a fraction to a decimal, the last digit of our decimal goes in the place value column with the same name as the denominator of our fraction.

For example, if we are converting the fraction \dfrac{1}{10} to a decimal, the 1 will go in the tenths column of our place value table since the denominator is 10.

Outcomes

AC9M4N01

recognise and extend the application of place value to tenths and hundredths and use the conventions of decimal notation to name and represent decimals

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