# Adding two 3-digit numbers (regrouping in one column)

In this lesson, we will build on our knowledge of partitioning and estimating and introduce column addition.

#### 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.What is 554 rounded to the nearest 10?

1/5

Q2.Does this look like a good estimate? 720 - 30 = 500

2/5

Q3.Does this look like a good estimate? 575 - 159 = 415

3/5

Q4.What is an estimated answer here? 604 - 350 =

4/5

Q5.What is this number rounded to the nearest 10? 996

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.What is 554 rounded to the nearest 10?

1/5

Q2.Does this look like a good estimate? 720 - 30 = 500

2/5

Q3.Does this look like a good estimate? 575 - 159 = 415

3/5

Q4.What is an estimated answer here? 604 - 350 =

4/5

Q5.What is this number rounded to the nearest 10? 996

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:

Q1.89 + 5 =

1/5

Q2.Which of these calculations requires regrouping?

2/5

Q3.105 + 106 =

3/5

Q4.234 + 372 =

4/5

Q5.520 + 634 =

5/5

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

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

Q1.89 + 5 =

1/5

Q2.Which of these calculations requires regrouping?

2/5

Q3.105 + 106 =

3/5

Q4.234 + 372 =

4/5

Q5.520 + 634 =

5/5

# Lesson summary: Adding two 3-digit numbers (regrouping in one column)

## 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:
Chair yoga