3. Multiplication and division

Lesson

Do you remember how to find the missing number in a number sentence, in order to make it balanced?

Complete the number sentence: 48 - ⬚ = 19 + 16

Worked Solution

Idea summary

For number sentences to be equivalent, or balanced, both sides must equal the same amount.

This video looks at how to find unknowns values in number sentences that involve one step.

Complete the statement with the missing number: 9\times⬚=135

Worked Solution

Idea summary

We can use a number line to find an unknown quantity.

Now we look at problems that will need more than one step to find the answer.

Complete the number sentence: 40 = 8 + 8 \times ⬚

Worked Solution

Idea summary

To find the missing number in a multi-step number sentence, we can make the number sentence simpler and solve that one first.

Sometimes you can make the problem easier if you simplify the question first, this video will show you how.

Let's work out what ⬚ must equal to make the following number sentence true.

⬚ + 16 = 3 \times 8

a

First, what does 3 \times 8 equal?

Worked Solution

b

So now we have ⬚ + 16 =24. What number plus 16 equals 24?

Worked Solution

Idea summary

To balance a number sentence, work out the value of one side first, and use the answer as the target value to work out the other side.

Solve problems involving multiplication of large numbers by one- or two-digit numbers using efficient mental, written strategies and appropriate digital technologies

Solve problems involving division by a one digit number, including those that result in a remainder

Use efficient mental and written strategies and apply appropriate digital technologies to solve problems

Use equivalent number sentences involving multiplication and division to find unknown quantities