at the end of tutorial 2 i gave you a problem to work on independently. watch as i use lattice...

LATTICE MULTIPLICATION

Tutorial 3

At the end of Tutorial 2 I gave you a problem to work on independently. Watch as I use LATTICE

MULTIPLICATION to solve that problem.

Tutorial 2’sOn Your Own Problem:

78 x 2 =

First, write the larger number down.

7 8

Draw a rectangle below this number.

7 8

The larger number is made up of 2 digits, so cut the rectangle into

two boxes.

7 8

Write the other problem number on the right of

the rectangle.

27 8

Cut the boxes diagonally. For each box draw a line from the bottom left to

the top right.

27 8

Now we do basic multiplication. Start with the 7. If we go

down from the 7 and across from the 2 they

“meet” in that first box.

27 8

7 x 2 = 1 4Write 1 in the top half of

the box and write 4 in the bottom half of the

box.

14 2

7 8

Move on to the 8. If we go down from the 8 and across from the 2 they “meet” in that second

box.

27 8

14

8 x 2 = 1 6 Write 1 in the top half of

the box and write 6 in the bottom half of the

box.

14

16 2

7 8

Extend your diagonal lines down.

14

16 2

7 8

Add the numbers inside the boxes. Use the diagonal lines

to guide you. Start on the right with the 6 then move to the left. 6 + nothing = 6. So put a 6 on the right of

the diagonal lines.

14

16 2

7 8

6

1 + 4 = 5. So put a 5 between the diagonal

lines.

14

16 2

7 8

65

1 + nothing = 1. So put a 1 to the left of the

diagonal lines.

14

16 2

7 8

651

That’s it!156 is your answer.

7 8 x 2 = 1 5 6

ON YOUR OWNTry the following

problem using the rules from today’s work. The answer will be the first

thing given in TUTORIAL 4.

On Your Own Problem:

93 x 5 =