# Adding two 3-digit numbers (without regrouping)

In this lesson, we will learn to partition 3-digit numbers in order to mentally add them accurately.

#### 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.When we subtract the original number always gets bigger? True or false?

1/5

Q2.Is this calculation correct? 456 - 300 = 200

2/5

Q3.567 + 300 =

3/5

Q4.212 - 100 =

4/5

Q5.515 + 600 =

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.When we subtract the original number always gets bigger? True or false?

1/5

Q2.Is this calculation correct? 456 - 300 = 200

2/5

Q3.567 + 300 =

3/5

Q4.212 - 100 =

4/5

Q5.515 + 600 =

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:

# Adding Two 3-Digit Numbers Quiz

Q1.Tick the 3 digit number

1/5

Q2.400 + 200 =

2/5

Q3.324 + 173 =

3/5

Q4.506 + 293 =

4/5

Q5.Which of these is the odd one out?

5/5

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

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

# Adding Two 3-Digit Numbers Quiz

Q1.Tick the 3 digit number

1/5

Q2.400 + 200 =

2/5

Q3.324 + 173 =

3/5

Q4.506 + 293 =

4/5

Q5.Which of these is the odd one out?

5/5

# Lesson summary: Adding two 3-digit numbers (without regrouping)

## 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