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.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

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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.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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

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