Multiplication

1
Multiplication

• Using the Lattice Method

2
Whats It All About?

• You are going to learn
• How to multiply two whole numbers.
• What skills should you have already?
• You need to be able to multiply up to 9 ? 9 and
  add single digit numbers.

3
Multiplication Using Lattice Demo

• Calculate 572 14
• Draw a box.
• You need
• three squares across and
• two squares down.

Because 5 7 2 has three digits and 1 4 has two
digits
4
Multiplication Using Lattice Demo

• Cut each square diagonally in half.
• Write the numbers to be multiplied around the top
  and right edges.
• Use a highlighter pen to highlight every other
  diagonal stripe.

5 7 2
1
4
5
Multiplication Using Lattice Demo

• Multiply the digits at the top and right of each
  cell and write the answer in the cell.

5 7 2
0 5
0 7
0 2
1
Ten Thousands
2 0
2 8
0 8
4
Thousands
Units
Hundreds
Tens
The digits in each diagonal stripe all have the
same place value...
6
Multiplication Using Lattice Demo

• Add up each stripe.
  
• Write the total for each stripe at the end of the
  stripe.

5 7 2
0 5
0 7
0 2
1
Ten Thousands
2 0
2 8
0 8
4
Thousands
Now we add up the digits, starting with the units
corner...
Units
Hundreds
Tens
7
Multiplication Using Lattice Demo

• Add up each stripe.
  
• Write the total for each stripe at the end of the
  stripe.

5 7 2
0 5
0 7
0 2
1
0
2 0
2 8
0 8
4
8
1
1
0
8
0
Always write down your answer...
572 14 8008
8
Question 1 (with answer)

• Calculate 76 21
• 
  

7 6
1 2
1 4
2
1
0 6
0 7
1
5
9
6
76 21 1596
9
Question 2 (with answer)

• Calculate 152 34
• 
  

1 5 2
0 3
1 5
0 6
0
3 4
0 8
0 4
2 0
1
5
1
6
8
152 34 5168
10
Question 3 (with answer)

• Calculate 237 14
• 
  

2 3 7
0 2
0 3
0 7
0
1 4
2 8
0 8
1 2
1
3
1
1
3
8
237 14 3318
11
Your Turn

• 1 532 65
• 2 63 51
• 3 234 97
• 4 7165 4
• 5 37 45
• 6 103 54

12
End