Deriving addition and subtraction facts

In this lesson, we will be deriving addition and subtraction facts by using part whole models to show how related facts can be derived from scaling up by 10, 100 or 1000.

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:

Deriving addition and subtraction facts

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

Question 1

Question 2

Question 3

Question 4

Question 5

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 = 12. Which is incorrect?

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:

Deriving addition and subtraction facts

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

Question 1

Question 2

Question 3

Question 4

Question 5

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 = 12. Which is incorrect?

5/5

Lesson summary: Deriving addition and subtraction facts

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