# Multiplying decimals using mental strategies

In this lesson, we will use doubling and round and adjust strategies to multiply decimal numbers. We will use doubling to multiply by two, four and eight and round and adjust in the context of money (e.g. £2.99 x 3).

#### 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!

Q1.18.2 x 3 =

1/5

Q2.5.3 x 8

2/5

Q3.Priya travels 19.3 km every day. How far does she travel over four days?

3/5

Q4.Tickets for a show cost £23.67. How much do seven tickets cost?

4/5

Q5.Train tickets cost £7.93. If Steve, his wife and three children go on a trip, how much will it cost them?

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!

Q1.18.2 x 3 =

1/5

Q2.5.3 x 8

2/5

Q3.Priya travels 19.3 km every day. How far does she travel over four days?

3/5

Q4.Tickets for a show cost £23.67. How much do seven tickets cost?

4/5

Q5.Train tickets cost £7.93. If Steve, his wife and three children go on a trip, how much will it cost them?

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

Your video will re-appear on the next page, and will stay paused in the right place.

# 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:

# Multiplying decimals using mental strategies

Well done for completing the lesson. Show what you now know by completing this exit quiz. You can choose which strategy you use: today we have covered round and adjust and doubling and halving.

Q1.Multiplying by four is the same as....

1/5

Q2.1.15 x 8 =

2/5

Q3.At the supermarket it costs £1.99 for one pack of berries. Which equation could I use to find out how much 6 packets were?

3/5

Q4.6.01 x 3

4/5

Q5.60.02 x 8 =

5/5

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

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

# Multiplying decimals using mental strategies

Well done for completing the lesson. Show what you now know by completing this exit quiz. You can choose which strategy you use: today we have covered round and adjust and doubling and halving.

Q1.Multiplying by four is the same as....

1/5

Q2.1.15 x 8 =

2/5

Q3.At the supermarket it costs £1.99 for one pack of berries. Which equation could I use to find out how much 6 packets were?

3/5

Q4.6.01 x 3

4/5

Q5.60.02 x 8 =

5/5

# Lesson summary: Multiplying decimals using mental strategies

## Time to move!

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

For 5 mins...

Move around:
Climb stairs

On the spot:
Chair yoga