# Using the inverse operation to find missing numbers

In this lesson, we will use our knowledge of multiplication and division 'fact families' in order to find the missing number in a range of questions. We will use arrays to represent the relationship between inverse operations, and explore how fact families around multiplication and division help us discover new facts about multiplication and division.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.The inverse of multiplication is...

1/5

Q2.Knowing your times tables can help to solve division calculations

2/5

Q3.The inverse of 3 x 4 = is

3/5

Q4.Which multiplication fact will help you solve this division calculation? 18 ÷ 6 =

4/5

Q5.I have 30 sweets to share with my friends. I have 5 friends. How many sweets will each of them get?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.The inverse of multiplication is...

1/5

Q2.Knowing your times tables can help to solve division calculations

2/5

Q3.The inverse of 3 x 4 = is

3/5

Q4.Which multiplication fact will help you solve this division calculation? 18 ÷ 6 =

4/5

Q5.I have 30 sweets to share with my friends. I have 5 friends. How many sweets will each of them get?

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

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# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Using the inverse operation to find missing numbers

Let's see what you have learnt today about 'fact families'

Q1.The inverse of division is

1/5

Q2.If you know that 3 x 6 = 18 this can help solve

2/5

Q3.Which number is missing from this this fact family 21, 7 and ....?

3/5

Q4.What fact family could this bead string represent?

4/5

Q5.This array shows 3 x 5 = 15 and ...

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Using the inverse operation to find missing numbers

Let's see what you have learnt today about 'fact families'

Q1.The inverse of division is

1/5

Q2.If you know that 3 x 6 = 18 this can help solve

2/5

Q3.Which number is missing from this this fact family 21, 7 and ....?

3/5

Q4.What fact family could this bead string represent?

4/5

Q5.This array shows 3 x 5 = 15 and ...

5/5

# Lesson summary: Using the inverse operation to find missing numbers

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Dance