1. Key idea:
To be able to multiply a number by 10, 100 and 1000
What
I’m
Looking
For
WILF:
Children who can multiply by 10, 100 and 1000, then say or write the new number they have made.
Hi, I’m Wilf, pleased to meet you!

2. x10
x10
x10 Th h t u 1
In the decimal system, the number in each column is 10 times bigger than the number to its right.

3. If we multiply any digit by ten it will move into the next column6
We must put a 0 in the empty units column to hold the place so 6 x 10 = 60

4. Let’s look at another number
x10 2
x10 3 Th h t u 2 3
Then we must remember to put the zero in to the hold the digits in place!
23 x 10 = 230

5. Write the answers on your whiteboards
Let’s try these together!
48 x 10 =
93 x 10 =
134 x 10 =
256 x 10 =
889 x 10 =
480
930
1,340
2,560
8,890
Write the answers on your whiteboards

6. 6 Th h t u If we multiply 6 by a hundred it will move up two columns
X 100 Th h t u 6
We must put a 0 in the empty columns to hold the place – 6 x 100 = 600

7. Write the answers on your whiteboards.
Let’s try these together!
800
8 x 100 =
15 x 100 =
28 x 100=
134 x 100 =
267 x 100 =
1,500
2,800
13,400
26,700
Write the answers on your whiteboards.

8. If we multiply 6 by a thousand it will move up three columns
x1000 Th h t u 6
We must put a 0 in the empty columns to hold the place – 6 x 1000 = 6000

9. Write the answers on your whiteboards.
Let’s try these examples!
9,000
9 x 1000 =
13 x 1000 =
64 x 1000=
149 x 1000 =
352 x 1000 =
13,000
64,000
149,000
352,000
Write the answers on your whiteboards.

10. Now you are going to try some yourselves
Now you are going to try some yourselves! You’re going to do some brain training with your partner.
Remember WILF: Children who can multiply by 10 then say or write the new number they have made.

11. Time for some more brain training, but this time we’re multiplying by 100!
Remember WILF: Children who can multiply by 100 and then say or write the new number they have made.

12. Now try multiplying by 1000 with your partner
Remember WILF: Children who can multiply by 1000 then say or write the new number they have made.

13. Now try to see if you can improve your score
Now try to see if you can improve your score. Can you try the last column on the sheet?
Remember WILF: Children who can multiply by 10, 100 and 1000 then say or write the new number they have made.

14. : 1 00

15. : 59

16. : 58

17. : 57

18. : 56

19. : 55

20. : 54

21. : 53

22. : 52

23. : 51

24. : 50

25. : 49

26. : 48

27. : 47

28. : 46

29. : 45

30. : 44

31. : 43

32. : 42

33. : 41

34. : 40

35. : 39

36. : 38

37. : 37

38. : 36

39. : 35

40. : 34

41. : 33

42. : 32

43. : 31

44. : 30

45. : 29

46. : 28

47. : 27

48. : 26

49. : 25

50. : 24

51. : 23

52. : 22

53. : 21

54. : 20

55. : 19

56. : 18

57. : 17

58. : 16

59. : 15

60. : 14

61. : 13

62. : 12

63. : 11

64. : 10

65. : 09

66. : 08

67. : 07

68. : 06

69. : 05

70. : 04

71. : 03

72. : 02

73. : 01

74. : 00
TIME’S
UP!
TIME’S
UP!

75. How did you do today? Can you remember the rules for multiplying by 10, 100 and 1000?
Remember WILF: Children who can multiply by 10, 100 and 1000 then say or write the new number they have made.