# Using Dienes to multiply a 2 digit number by a 1 digit number

In this lesson, we will learn to multiply 2 digit numbers by 1 digit numbers using Dienes blocks. We will use visual representations to make multiplication processes clearer, and we will investigate when to regroup quantities when using Dienes blocks.

#### 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.Which is an example of partitioning?

1/6

Q2.Partitioning makes multiplying two digit numbers easier.

2/6

Q3.13 x 5 =

3/6

Q4.17 x 3 =

4/6

Q5.18 x 4 =

5/6

Q6.Use what you know about place value to work out 180 x 4 =

6/6

#### 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.Which is an example of partitioning?

1/6

Q2.Partitioning makes multiplying two digit numbers easier.

2/6

Q3.13 x 5 =

3/6

Q4.17 x 3 =

4/6

Q5.18 x 4 =

5/6

Q6.Use what you know about place value to work out 180 x 4 =

6/6

# 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:

# Using Dienes to Multiply a 2 Digit Number by a 1 Digit Number Quiz

Take the quiz to test your new knowledge!

Q1.What is 22 x 4?

1/5

Q2.What is the missing word? If there are ten or more ones, we must ______________ the ones into tens and ones.

2/5

Q3.Do you need to regroup ones into tens when calculating 11 x 7?

3/5

Q4.Do you need to regroup tens when calculating 43 x 4?

4/5

Q5.What do you need to regroup when calculating 45 x 5?

5/5

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

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

# Using Dienes to Multiply a 2 Digit Number by a 1 Digit Number Quiz

Take the quiz to test your new knowledge!

Q1.What is 22 x 4?

1/5

Q2.What is the missing word? If there are ten or more ones, we must ______________ the ones into tens and ones.

2/5

Q3.Do you need to regroup ones into tens when calculating 11 x 7?

3/5

Q4.Do you need to regroup tens when calculating 43 x 4?

4/5

Q5.What do you need to regroup when calculating 45 x 5?

5/5

# Lesson summary: Using Dienes to multiply a 2 digit number by a 1 digit number

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga