# Deriving addition and subtraction facts by using given calculations

In this lesson, we will derive addition and subtraction facts by using given calculations, consider how the whole or parts have changed and the impact this has on the new calculation.

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 I know 3 + 3 = 6, then I know...

1/5

Q2.If I know 3 + 5 = 8, then I know...

2/5

Q3.What's the missing part in the following equation: 220 + ___ = 550

3/5

Q4.What's the missing part in the following equation: 110 + ___ = 660

4/5

Q5.Here are three derived facts, based on the fact 3 + 5 = 8. Which is incorrect?

5/5

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 I know 3 + 3 = 6, then I know...

1/5

Q2.If I know 3 + 5 = 8, then I know...

2/5

Q3.What's the missing part in the following equation: 220 + ___ = 550

3/5

Q4.What's the missing part in the following equation: 110 + ___ = 660

4/5

Q5.Here are three derived facts, based on the fact 3 + 5 = 8. Which is incorrect?

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.

Quiz:

# Deriving addition and subtraction facts by using given calculations

Using what we have learnt today, can you answer the following questions?

Q1.What's the same? What's different? 364 + 302 = 666 and 374 + 302 = 676

1/5

Q2.What's the same? What's different? 764 - 204 = 560 and 754 - 204 = 550

2/5

Q3.What's the same? What's different? 3672 + 1474 = 5146 and 3972 + 1474 = 5446

3/5

Q4.If... 362 + 205 = 567 then... 262 + 205 = ?

4/5

Q5.If... 751 - 303 = 448 then... 741 - 303 = ?

5/5

Quiz:

# Deriving addition and subtraction facts by using given calculations

Using what we have learnt today, can you answer the following questions?

Q1.What's the same? What's different? 364 + 302 = 666 and 374 + 302 = 676

1/5

Q2.What's the same? What's different? 764 - 204 = 560 and 754 - 204 = 550

2/5

Q3.What's the same? What's different? 3672 + 1474 = 5146 and 3972 + 1474 = 5446

3/5

Q4.If... 362 + 205 = 567 then... 262 + 205 = ?

4/5

Q5.If... 751 - 303 = 448 then... 741 - 303 = ?

5/5

# Lesson summary: Deriving addition and subtraction facts by using given calculations

## 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