# Lattice Multiplication A NEW way to Multiply - PowerPoint PPT Presentation

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Lattice Multiplication A NEW way to Multiply. By: Mrs. Overley 4 th Grade Math Teacher. Directions!!!!!!. Lattice Multiplication. First Look your problem. Determine the number of digits in the first factor. (The numbers on the Top)

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Lattice Multiplication A NEW way to Multiply

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## Lattice MultiplicationA NEW way to Multiply

By: Mrs. Overley

Directions!!!!!!

### Lattice Multiplication

• Determine the number of digits in the first factor. (The numbers on the Top)

• Then determine the number of digits in the second factor. (The numbers on the Bottom)

• Now construct (draw) a big box and divide it to where you have the same number of squares needed for the number of digits located in the top and bottom factors. See left.

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X 28

Lattice Multiplication

• Now divide each of the smaller boxes in half.

Like below.

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X 28

### Lattice Multiplication

• Now, write the first factor across the top and the second factor down the side.

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• Now begin to multiply the first factors together, the tens digit goes in the top half of the box and the ones digit goes in the bottom half.

Lattice Multiplication

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• Now continue multiplying. (If the answer is a single digit, such as 6, then place a 0 in the top half the box and write a 6 in the bottom half.)

Lattice Multiplication

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### N

• Now add each of the columns diagonally. Regroup when necessary.

• Follow the same steps for 3-digit by 2-digit numbers! (Or can be used with any multiplication problem!)

Lattice Multiplication

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X 28