To find double and half within 20

In this lesson, we will double numbers by adding the same number to itself and halve even numbers by sharing equally between two groups.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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.What number would come next: 19, 18, 17 ___

Select one (1) boxes

1/3

Q2.What number would come first: ___ 12, 10, 8, 6, 4, 2

Select one (1) boxes

2/3

Q3.What is the missing number? 20, 18, ___, 14, 12, 10

3/3

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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.What number would come next: 19, 18, 17 ___

Select one (1) boxes

1/3

Q2.What number would come first: ___ 12, 10, 8, 6, 4, 2

Select one (1) boxes

2/3

Q3.What is the missing number? 20, 18, ___, 14, 12, 10

3/3

Video

Play 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.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

To find double and half within 20

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.Use counting objects to find half 18:

1/4

Q2.Use counting objects to find half 12:

2/4

Q3.Use counting objects to find double 9:

3/4

Q4.Use counting objects to find double 6:

4/4

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

To find double and half within 20

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.Use counting objects to find half 18:

1/4

Q2.Use counting objects to find half 12:

2/4

Q3.Use counting objects to find double 9:

3/4

Q4.Use counting objects to find double 6:

4/4

Lesson summary: To find double and half within 20

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Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Chair yoga