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