# Applying number bonds within twenty to add and subtract

In this lesson, we will be adding and subtracting 2 digit numbers with regrouping by using our number bond knowledge. We will use number lines to visualise the process.

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

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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.If I know that 3 plus 4 is equal to 7, then I know 3 tens plus 4 tens is equal to 70.

1/4

Q2.'Counting in ones' is the most efficient way of counting

2/4

Q3.If I know that 6 = 4 + 2 and 5 = 3 + 2, then I can use these facts and say that 65 - 42 = 23.

3/4

Q4.'Counting all' is the most efficient way of counting

4/4

#### 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.If I know that 3 plus 4 is equal to 7, then I know 3 tens plus 4 tens is equal to 70.

1/4

Q2.'Counting in ones' is the most efficient way of counting

2/4

Q3.If I know that 6 = 4 + 2 and 5 = 3 + 2, then I can use these facts and say that 65 - 42 = 23.

3/4

Q4.'Counting all' is the most efficient way of counting

4/4

# 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.

# Lesson summary: Applying number bonds within twenty to add and subtract

## Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Dance