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LATTICE MULTIPLICATION
Tutorial 3
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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.
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Tutorial 2’sOn Your Own Problem:
78 x 2 =
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First, write the larger number down.
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7 8
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Draw a rectangle below this number.
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7 8
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The larger number is made up of 2 digits, so cut the rectangle into
two boxes.
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7 8
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Write the other problem number on the right of
the rectangle.
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27 8
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Cut the boxes diagonally. For each box draw a line from the bottom left to
the top right.
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27 8
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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.
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27 8
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7 x 2 = 1 4Write 1 in the top half of
the box and write 4 in the bottom half of the
box.
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14 2
7 8
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Move on to the 8. If we go down from the 8 and across from the 2 they “meet” in that second
box.
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27 8
14
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8 x 2 = 1 6 Write 1 in the top half of
the box and write 6 in the bottom half of the
box.
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14
16 2
7 8
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Extend your diagonal lines down.
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14
16 2
7 8
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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.
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14
16 2
7 8
6
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1 + 4 = 5. So put a 5 between the diagonal
lines.
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14
16 2
7 8
65
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1 + nothing = 1. So put a 1 to the left of the
diagonal lines.
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14
16 2
7 8
651
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That’s it!156 is your answer.
7 8 x 2 = 1 5 6
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ON YOUR OWNTry the following
problem using the rules from today’s work. The answer will be the first
thing given in TUTORIAL 4.
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On Your Own Problem:
93 x 5 =