1. Year 5 (National Numeracy Strategy) (Based on DFEE Sample Lessons)
Dr Fog Presents
Using doubling
in multiplication
Year 5 (National Numeracy Strategy)
(Based on DFEE Sample Lessons)

2. Resources
None!

3. Mental Learning Objective
I can double the most significant digit first when doubling two- and three- digit numbers mentally.

4. Mental Learning Task
Today we are going to practise doubling and how we can use it to help with multiplying.

5. Mental Learning Task Chant as a class your two times table.
Chant as a class your four times table.

6. Mental Learning Task
Fill in the rest of this table, using the two and four times tables…. 2 4 6 8 12

7. Mental Learning Task
Fill in the rest of this table, using the eight times tables…. 2 4 6 8 12 16

8. Mental Learning Task
Fill in the rest of this table, using the sixteen times tables…. 2 4 6 8 12 16

9. Mental Learning Objective
I can double the most significant digit first when doubling two- and three- digit numbers mentally.

10. Main Learning Objective
We are going to continue with the same learning objective.
I can double the most significant digit first when doubling two- and three- digit numbers mentally.

11. Key idea Doubling any number is easy if you double each digit in turn
and keep notes.

12. Main Learning Task Now move on to doubling multiples of 10.
I am now going to say a number and I want you all to call out its double.

13. Main Learning Task
What is double… 10

14. Main Learning Task
What is double… 30

15. Main Learning Task
What is double… 50

16. Main Learning Task
What is double…
200

17. Main Learning Task
What is double… 70

18. Main Learning Task
We are now going to double other two-digit numbers which are not multiples of 10.

19. Main Learning Task
What is double…. 24

20. Main Learning Task
What is double…. 31

21. Main Learning Task
What is double…. 41

22. Main Learning Task
What is double…. 15

23. Main Learning Task
What is double…. 43

24. Main Learning Task
Now we are going to try some numbers which are harder to double.
When it comes to doubling numbers such as 96 or 47 you have more to remember than when you are doubling a number such as 42.

25. Main Learning Task
That is because when you double the ‘ones’ digit you get a number more than ten
You have to remember what it is while you double the ‘tens’ digit and then add them together.

26. Main Learning Task Let’s start by doubling 47. Double the 40
Add together.

27. Main Learning Task
Can you double this numbers? 49

28. Main Learning Task
Can you double this numbers? 37

29. Main Learning Task
Can you double this numbers? 29

30. Main Learning Task
Can you double this numbers?
470

31. Main Learning Task
Can you double this numbers?
360

32. Main Learning Task
Can you double this numbers?
120

33. Main Learning Task Now we are going to move on to some higher numbers.
What is double 360?

34. Main Learning Task We will now try to double even harder numbers.
Double the hundreds, tens and units separately.

35. Main Learning Task
What is double…..
479

36. Main Learning Task
What is double…..
956

37. Main Learning Task Now try to double these numbers. 64 24 44 43 24

38. Main Learning Objective
I can double the most significant digit first when doubling two- and three- digit numbers mentally.

39. Plenary Mark your work as the teacher calls out the answer

40. Plenary Finish with some repeated doubling with the class.
Start with a single-digit number and send it around the class, each person doubling the person before’s.
How high can the class go?

41. Review of Key Idea
Doubling any number is easy if you double each digit in turn and keep notes.
Did you learn how to do this today?

42. Where Can I Find More Resources Like This?
You can now visit my teaching resource website at
You can click here to search for more of my teaching resources.
Click here to visit my TES shop!