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Lattice Multiplication

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Lattice Multiplication One option to solve multi-digit multiplication problems This is the problem! Let s try using the Lattice Method Lattice Multiplication One ... – PowerPoint PPT presentation

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Title: Lattice Multiplication


1
Lattice Multiplication
  • One option to solve multi-digit multiplication
    problems

2
This is the problem!
47 X 23
What do I do? I havent even learned my 12s yet!
3
Lets try using the Lattice Method
First we need to draw a rectangle
A square is a type of rectangle!!
4
Next we need to divide the rectangle into four
squares (since there are four digits in the
problem).
5
Now we need to add the numbers. The first number
goes on top (one digit for each column) The
second number goes on the right side (one digit
for each row).
4
7
2
3
6
Now we add the diagonals (starting in upper right
corner of each square).
7
4
2
3
7
Now, we get to do math ?. We need to multiply
the digits and place the products in the boxes.
The 10s digit goes in the top half and the ones
go in the bottom half. If no digit put a zero in
its place.
7
4
0
1
2
8
4
1
2
3
2
1
8
Now we add along the diagonals to get our answer.
7
4
0
1
1
2
1
8
4
1
2
3
0
2
1
8
1
9
Write the answer, use sums going counter
clockwise.
7
4
0
1
2
1
8
4
1
2
3
0
2
1
8
1
47 X 23 1,081
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