Topics
1. Number and place value
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Australia
Year 4

1.06 Multiplication and division by 10's, connecting to place value

Lesson
Practice
Lesson

Are you ready?

Do you remember how to use  models to represent place value  ?

Examples

Example 1

Use the least amount of blocks possible to make the number 530.

Worked Solution
Create a strategy

Write the number in a place value table. Recall that each kind of block represents a different place value.

This image shows a hundreds, tens, and ones blocks.
Apply the idea

Write the number 530 in this place value table.

HundredsTensUnits
590

The place value table tells that 530 has 5 hundreds, 3 tens, and 0 units. So the blocks below make 530.

5 hundreds blocks, and 3 tens blocks
Idea summary

A place value table is useful to find how many blocks are needed to make a number.

Multiply or divide by ten

By remembering that each digit in our number is ten times larger than the place to its right, we can multiply or divide by 10.

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Examples

Example 2

Complete these number sentences.

a

9 \times 10 = ⬚

Worked Solution
Create a strategy

Remember that each column in the place value table is 10 times larger than the one to its right.

Place value table with 9 tens and 0 ones. Ask your teacher for more information.

When multiplying a number by 10, all the digits move to the left one column in the place value table.

Apply the idea

Here is 9 in a place value table:

TensUnits
9

When we multiply by 10, the 9 moves to the left in the table and we use 0 as a place holder.

TensUnits
90

9 \times 10 = 90

b

90 \times 10 = ⬚

Worked Solution
Create a strategy

Remember that each column in the place value table is 10 times larger than the one to its right.

Place value table with 9 hundreds, 0 tens and 0 ones. Ask your teacher for more information.

When multiplying a number by 10, all the digits move to the left one column in the place value table.

Apply the idea

Here is 90 in a place value table:

HundredsTensUnits
90

When we multiply by 10, the 3 and 0 move to the left in the table and we use 0 as a place holder.

HundredsTensUnits
900

90 \times 10 = 900

c

900 \times 10 = ⬚

Worked Solution
Create a strategy

Remember that each column in the place value table is 10 times larger than the one to its right.

Place value table with 9 thousands, 0 hundreds, 0 tens and 0 ones. Ask your teacher for more information.

When multiplying a number by 10, all the digits move to the left one column in the place value table.

Apply the idea

Here is 900 in a place value table:

ThousandsHundredsTensUnits
900

When we multiply by 10, the 3 and 0s move to the left in the table and we use 0 as a place holder.

ThousandsHundredsTensUnits
9000

900 \times 10 = 9000

d

9000 \times 10 = ⬚

Worked Solution
Create a strategy

Remember that each column in the place value table is 10 times larger than the one to its right.

Place value table with 9 ten thousands, 0 thousands, 0 hundreds, 0 tens and 0 ones. Ask your teacher for more information.

When multiplying a number by 10, all the digits move to the left one column in the place value table.

Apply the idea

Here is 9000 in a place value table:

Ten thousandsThousandsHundredsTensUnits
9000

When we multiply by 10, the 3 and 0s move to the left in the table and we use 0 as a place holder.

Ten thousandsThousandsHundredsTensUnits
90000

9000 \times 10 = 90\,000

Idea summary

When we multiply by 10, our number becomes ten times bigger, so the digit moves to the next highest place, by moving left.

When we divide by 10, our number becomes ten times smaller. so the digit moves one place right.

Outcomes

AC9M4N06

develop efficient strategies and use appropriate digital tools for solving problems involving addition and subtraction, and multiplication and division where there is no remainder

AC9M4A02

recall and demonstrate proficiency with multiplication facts up to 10 x 10 and related division facts; extend and apply facts to develop efficient mental strategies for computation with larger numbers without a calculator

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