# Adding and subtracting multiples of 100 to/from 3-digit numbers

In this lesson, we will use known number facts in order to mentally add and subtract multiples of 100 to and from 3-digit numbers. We will look at partitioning strategies and analyse place value to make mental addition and subtraction more efficient.

#### 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 number we started with gets...

1/5

Q2.356 - 40 = 326 True or false?

2/5

Q3.673 - 60 =

3/5

Q4.532 - 40 =

4/5

Q5.300 - 60 =

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 number we started with gets...

1/5

Q2.356 - 40 = 326 True or false?

2/5

Q3.673 - 60 =

3/5

Q4.532 - 40 =

4/5

Q5.300 - 60 =

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 and Subtracting Multiples of 100 to/from 3-Digit Numbers Quiz

Let's see how much you have learnt about adding and subtracting multiples of 100 from/to 3-digit numbers

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:

# Adding and Subtracting Multiples of 100 to/from 3-Digit Numbers Quiz

Let's see how much you have learnt about adding and subtracting multiples of 100 from/to 3-digit numbers

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

# Lesson summary: Adding and subtracting multiples of 100 to/from 3-digit numbers

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Dance