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…

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

Multiplication Using Lattice Demo

1

4

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

5 7 2

Multiplication Using Lattice Demo

1

4

0 5

0 7

0 2

2 0

2 8

0 8

Ten Thousands

Thousands

UnitsHundredsTensThe digits in each diagonal stripe all have the same place

value...

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

5 7 2

Multiplication Using Lattice Demo

1

4

0 5

0 7

0 2

2 0

2 8

0 8

Ten Thousands

Thousands

UnitsHundredsTensNow we add up the digits, starting with the units

corner...

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

5 7 2

Multiplication Using Lattice Demo

1

4

0 5

0 7

0 2

2 0

2 8

0 8

0 8 0

8

0

11

Always write down your answer... 572 × 14 =

8008

Question 1 (with answer)

Calculate 76 × 21

7 6

2

1

1

5

9

76 × 21 = 1596

1 4

1 2

0 7

0 6 6

Question 2 (with answer)

Calculate 152 × 34

1 5 2

3

4

0 3

1 5

0 6

0 4

2 0

0 8

0

5

6 81

1

152 × 34 = 5168

Question 3 (with answer)

Calculate 237 × 14

2 3 7

1

4

0 2

0 3

0 7

0 8

1 2

2 8

0

3

1 83

1

237 × 14 = 3318

1

Your Turn 1 532 × 65

2 63 × 51

3 234 × 97

4 7165 × 4

5 37 × 45

6 103 × 54

End