Transcript Multiplication - Lattice method integers New

Multiplication
Using the Lattice Method
What’s 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.
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…
Multiplication Using Lattice Demo
Cut each square diagonally in half.
Write the numbers to be multiplied around the top and right edges.
5
7
2
1
4
Use a highlighter pen to highlight every other diagonal stripe.
Multiplication Using Lattice Demo
Multiply the digits at the top and right of each cell and write the
answer in the cell.
5
Ten Thousands
Thousands
The digits in each diagonal
stripe all have the same place
value...
7
0
2
2
0
5
0
2
0
7
8
0
2
8
Hundreds Tens Units
1
4
Multiplication Using Lattice Demo
Add up each stripe.
Write the total for each stripe at the end of the stripe.
5
Ten Thousands
Thousands
Now we add up the digits,
starting with the units
corner...
7
0
2
2
0
5
0
2
0
7
8
0
2
8
Hundreds Tens Units
1
4
Multiplication Using Lattice Demo
Add up each stripe.
Write the total for each stripe at the end of the stripe.
5
0
0
8 21
Always write down your
answer...
7
0
5
0
0
2
1
2
0
7
0
8
0
2
8
8
572 × 14 = 8008
1
4
Question 1
(with answer)
Calculate 76 × 21
7
1
1
1
5 0
6
4
7
9
0
2
6
2
1
6
76 × 21 = 1596
Question 2
(with answer)
Calculate 152 × 34
1
0
51
5
0
0
1
3
0
5
2
4
1
2
0
6
8
0
6
3
4
8
152 × 34 = 5168
Question 3
(with answer)
Calculate 237 × 14
2
0
0
3
0
2
0
1
3 18
3
1
3
0
2
7
7
8
2
1
1
4
8
237 × 14 = 3318
Your Turn
1
532 × 65
2
63 × 51
3
234 × 97
4
7165 × 4
5
37 × 45
6
103 × 54
End