成人快手

What is place value?

It is important to understand the place value of each digit in a number to be able to order numbers.

Some ways that can help you to identify the place value of each digit are:

  • place value charts
  • part-whole models
  • base 10
  • counters

These can help you decide whether a number is larger or smaller than another.

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Example 1

Put these numbers in ascending order.

Three representations for showing numbers: A place value chart, a number written in digits and counters.

First, work out what number each representation is showing.

  • A is made up of 3 ten thousands, 4 thousands, 1 hundred, 2 tens and 1 one, making 34,121.

  • B is already written as a number - 32,769.

  • C has 3 ten thousands, 3 thousands, 2 hundreds, 2 tens and 1 one, making 33,221.

You can now compare the numbers. All of them are in the thirty thousands, so look at the thousands column.

The smaller the number in the thousands, the smaller the number!

The written number 32769, counters showing 33221 and a place value chart showing 34121.

By comparing the thousands, the numbers are now in ascending order.

What if the thousands are the same?

You would look at the hundreds column instead to compare those digits!

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Example 2

Put these numbers in descending order.

Representing numbers with counters, a place value chart and number line

Again, work out what number each place value representation shows.

  • A - The counters show 4 ten thousands, 1 thousand, 2 hundreds, 1 ten and 2 ones - 41,212.

  • B - The place value chart shows 4 ten thousands, 1 thousand, 2 hundreds, 3 tens and 1 one - 41,231.

  • C - The number line involves some estimation. The arrow appears half way between 41,100 and 41,200, so it must be pointing at 41,150.

All of the numbers have the same amount of ten thousands and thousands, so look at the hundreds to compare them.

A and B also have the same amount of hundreds, so just move onto the tens to compare the numbers.

Here are the numbers in descending order:

Place value chart showing 41231, counters showing 41212 and number line showing 41150
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Activity

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More on Place value

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