LO To understand different
methods for multiplication.
9-Nov-14
Starter Activity
You have been given two calculations.
Can you spot the mistakes and correct them?
3 Students each buy 2 apples on 5 students buy 8 apples each.
the 5 days they go to school in a The cost of an apple is 49p.
week.
How much did they spend?
5 x 8 = 40 x 50 = 2000
How many apples do they buy? 40 x 1 = 40
2000 - 40 = 1960
3 x 2 = 6 x 5 = 30
Correction
Correction
Think / Pair / Share
I want to know what 7 x 8 is but I don’t
know either my 7 x table or my 8 times
table.
What can I do?
Class suggestions …..
7x8=
Think / Pair / Share
Now I know that 7 x 8 = 56
What else do I know?
For example, do I also know 7 x 80?
Class suggestions 7 x 8 = 56 so…….
The Box Method
54.2 x 32.3 =
x
30
2
0.3
50
4
0.2
Draw this grid on your mini whiteboards.
Fill in any boxes that you can. Don’t worry if you can’t do
all of them.
Using a multiplication square to multiply
6 x 8 = 48
Go down the column until
you reach 8 sixes
Find the 6 x table
x
1
2
3
4
5
6
7
8
9
10
1
1
2
3
4
5
6
7
8
9
10
2
2
4
6
8
10
12
14
16
18
20
3
3
6
9
12
15
18
21
24
27
30
4
4
8
12
16
20
24
28
32
36
40
5
5
10
15
20
25
30
35
40
45
50
6
6
12
18
24
30
36
42
48
54
60
7
7
14
21
28
35
42
49
56
63
70
8
8
16
24
32
40
48
56
64
72
80
9
9
18
27
36
45
54
63
72
81
90
10
10
20
30
40
50
60
70
80
90
100
What level can I work at?
Level 2
I can work out multiplication sums up to 10 x 10.
Level 3
I can multiply two digit numbers by
2, 3, 4, 5 or 10.
Level 4
I can multiply two digit whole numbers by a single
digit whole digit number.
Level 5
I can multiply two digit numbers by three digit
numbers.
Level 6
I can multiply decimal numbers.
Choose an appropriate level of challenge to start on.
You do not have to complete all of the questions for each level before moving on.
Answer all the questions in your book. Show all your working out.
Level 2
Level 3
Level 4
Level 5
Level 6
a) 3 x 4 =
13 x 3 =
23 x 9 =
33 x 92 =
3.4 x 9.2 =
b) 8 x 2 =
28 x 2 =
48 x 7 =
58 x 47 =
58. 3 x 4.7 =
c) 7 x 5 =
37 x 4 =
57 x 8 =
27 x 38 =
27. 1 x 13.8 =
d) 6 x 9 =
26 x 5 =
76 x 6 =
86 x 62 =
8.64 x 6.23 =
e) 3 x 8 =
73 x 10 =
83 x 8 =
84 x 28 =
84.6 x 28.7 =
f) 7 x 7 =
57 x 2 =
97 x 7 =
95 x 71 =
95.4 x 71.2 =
g) 10 x 3 =
17 x 3 =
37 x 6 =
47 x 62 =
4.77 x 6.2 =
h) 9 x 8 =
49 x 4 =
49 x 8 =
59 x 83 =
0.59 x 8.3 =
i) 4 x 5 =
34 x 5 =
54 x 9 =
74 x 29 =
0.74 x 0.29 =
Plenary
What is wrong with this
statement?
42 x 34 =
40 x 30 = 1200
2x4=8
42 x 34 = 1208