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Long Multiplication
Starter!
Write 3 Bullet Points:
What do you know about Interior and Exterior
angles?
1.
2.
3.
Long Multiplication
Objectives
• All can do long multiplication
• Most can use two different methods to solve
long multiplication questions
• Some can estimate answers using long
multiplication
Multiply these numbers…
10 X 20 =
200
70 X 3 =
210
5 X 20 =
100
25 X 5 =
125
150
40 X 6 =
240
30 X 5 =
18 X 15 =
270
24 X 11 =
264
39 X 22 =
858
Three Different Methods
• 1. Grid method
• 2. Diagonal method
• 3. Long method
1. Grid Method
• Work out 45 X 24
X
20
4
40
800
160
You try…!
5
100
918
2. 81 X 64 =
5184
3. 29 X 45 =
1305
20
800 + 100 + 160 + 20 =
1080
1. 54 X 17 =
2. Diagonal Method
• Work out 45 X 24
You try…!
1. 27 X 82 =
2214
2. 53 X 21 =
1113
3. 96 X 63 =
6048
Diagonal Method continues…
• 452 X 371
167692
3. Long method…
• Work out 45 X 24
4 5
X 2 4__
You try…!
1. 23 X 46 =
1058
2. 54 X 73 =
3942
3. 92 X 14 =
1288
Long Multiplication
Objectives
• All can do long multiplication
• Most can use two different methods to solve
long multiplication questions
• Some can estimate answers using long
multiplication
WILT
• 1.
• 2.
• What I am unsure about….
• 1.