1. Answer these quick fire questions on your mini whiteboards.

2. Multiply any integer by 10, 100 and 1000.
Learning Objective
Multiply any integer by 10, 100 and 1000.

3. Discuss the following numbers…26
260
26000

4. What is the relationship between these numbers?26
260
26000

5. What number is missing in the sequence?26
260
26000

6. What happens when we multiply 19 by 10?
It looks like we add a zero, but really all the numbers move one place along the grid to the left.

7. Now multiply by 100….
Now multiply by 1000…

8. Mental Maths

9. Multiply any integer by 10, 100 and 1000 in the context of money.
Learning Objective
Multiply any integer by 10, 100 and 1000 in the context of money.

10. How can I multiply this number by 10? 100? 1000?
12000
How can I multiply this number by 10? 100? 1000?

11. What if I wanted to divide this number by 10? 100? 1000?
12000
What if I wanted to divide this number by 10? 100? 1000?

12. How can I multiply this number by 10? 100? 1000?
4.5
How can I multiply this number by 10? 100? 1000?

13. What if I wanted to divide this number by 10? 100? 1000?
4.5
What if I wanted to divide this number by 10? 100? 1000?

14. Now try these…

15. Mental Maths

16. What if I wanted to divide this number by 10? 100? 1000?
27000
What if I wanted to divide this number by 10? 100? 1000?

17. Jo’s shelf is 126cm long. She wants to put 10 boxes on this shelf
Jo’s shelf is 126cm long. She wants to put 10 boxes on this shelf. How much space will she have for each box?

18. Henri has scored 5923 runs in cricket over 100 matches
Henri has scored 5923 runs in cricket over 100 matches. How many runs has he scored on average in each match?

19. Multiply using the grid method including decimals.
Learning Objective
Multiply using the grid method including decimals.

20. First partition each number like this.
STARTING OFF
89 x 123 X 80 9
100 20 3
First partition each number like this.

21. Where everything goes…X 80 9
100 20 3
Now times where the arrows meet (where the dots are).
8000
900
1600
180
240 27

22. Totalling
Now total up all the circled numbers. X 80 9
100
8000
900 20
1600
180 3
240 27 =
8900 =
1780 =
267 +
10947

23. Multiply using the grid method including decimals.
Learning Objective
Multiply using the grid method including decimals.

24. CLICK ON ME!

25. First partition each number like this.
STARTING OFF
4.3 x 6.2 X 4
0.3 6
0.2
First partition each number like this.

26. Where everything goes…X 4
0.3 6
0.2
Now times where the arrows meet (where the dots are). 24
1.2
0.8
0.06

27. = = = Totalling X 4 0.3 6 0.2 + Now total up all the circled numbers.
25.8 24
1.8 =
0.86
0.8
0.06 = +