1. Halving and Doubling 10 questions
Lesson # 8
Halving and Doubling
10 questions

2. Did you know…
You can take half of one factor and double the other ?

3. Without changing the…
PRODUCT (Answer)

4. Watch…
4 x 5
is like
2 x 10

5. OR…
8 X 5
Is like
4 X 10

6. So what you do is…
Take half of either number (the easiest one to cut in two)

7. And then…
Double the other one!

8. Then multiply!
Example:
4 X 15 …
Is like…
2 X 30.

9. You can even do that a third or fourth time…
Watch…
15 X 32…
Is like…
30 X 16…
Which is also like…
60 X 8 =
480 !

10. And now for some (10) P R A C T I E

11. Questions !
Ready?
Set…
Go!

12. Question # 1
15 X 4 = ?

13. Question # 2
6 X 15 = ?

14. Question # 3
4 X 35 = ?

15. Question # 4
13 X 8 = ?

16. Question # 5
16 X 25 = ?

17. Question # 6
8 X 18 = ?

18. Question # 7
35 X 12 = ?

19. Question # 8
8 X 250 = ?

20. Question # 9
12 X 225 = ?

21. Question # 10
15 X 32 = ?

22. And now for the Answers !
Prepare yourself !

23. Question # 1
15 X 4 = 60

24. Question # 2
6 X 15 = 90

25. Question # 3
4 X 35 =
140

26. Question # 4
13 X 8 =
104

27. Question # 5
16 X 25 =
400

28. Question # 6
8 X 18 =
144

29. Question # 7
35 X 12 =
420

30. Question # 8
8 X 250 =
2000

31. Question # 9
12 X 225 =
2700

32. Question # 10
15 X 32 =
480

33. The
END