In this lesson, we will identify which known number bonds will help us to add two 2-digit numbers and use known facts to derive new addition facts.

#### 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 2 + 3 = 5 then 20 + 30 = _____

1/5

Q2.If I know that 6 - 2 - 3 = 1 then 60 - 20 - 30 = ____

2/5

Q3.What is 40 - 30?

3/5

Q4.What is 67 - 20?

4/5

Q5.Seventy Two subtract Thirty is equal to ______

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.If 2 + 3 = 5 then 20 + 30 = _____

1/5

Q2.If I know that 6 - 2 - 3 = 1 then 60 - 20 - 30 = ____

2/5

Q3.What is 40 - 30?

3/5

Q4.What is 67 - 20?

4/5

Q5.Seventy Two subtract Thirty is equal to ______

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:

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

Q1.If 3 + 6 = 9 then 39 + 60 = ______

1/5

Q2.Which TWO number facts help us to solve 24 + 35?

Select two (2) boxes

2/5

Q3.Which TWO number facts help us to solve 17 + 52?

Select two (2) boxes

3/5

Q4.Which TWO number facts help us to solve 23 + 54?

Select two (2) boxes

4/5

Q5.What is 63 + 12?

5/5

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

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

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

Q1.If 3 + 6 = 9 then 39 + 60 = ______

1/5

Q2.Which TWO number facts help us to solve 24 + 35?

Select two (2) boxes

2/5

Q3.Which TWO number facts help us to solve 17 + 52?

Select two (2) boxes

3/5

Q4.Which TWO number facts help us to solve 23 + 54?

Select two (2) boxes

4/5

Q5.What is 63 + 12?

5/5

# Lesson summary: Adding two 2-digit numbers

## 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:
Dance