Lattice Multiplication with Decimals

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# Lattice Multiplication with Decimals - PowerPoint PPT Presentation

Lattice Multiplication with Decimals. Step-by-Step. 3.42 * 6.9 =. Ok! I know how to do Lattice, but I don’t remember how to multiply with decimals!!!. 3.42 * 6.9.

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## Lattice Multiplication with Decimals

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Presentation Transcript

### Lattice Multiplicationwith Decimals

Step-by-Step

3.42 * 6.9 =

Ok! I know how to do Lattice, but I don’t remember how to multiply with decimals!!!

3.42 * 6.9

Make a grid the exact size of your problem. A 2 digit number times a 3 digit number gets a 2 x 3 grid. Draw a diagonal line in each box.

4

3

2

6

9

3.42 * 6.9

Place the decimal point above/beside the line in the grid.

.

4

3

2

.

6

9

3.42 * 6.9

.

Multiply 6 * 2 and place the answer in the grid where the lines meet.

4

3

2

1

6

.

2

9

3.42 * 6.9

.

Multiply 4 * 6 and place the answer in the grid where the lines meet.

4

3

2

2

1

.

6

4

2

9

3.42 * 6.9

Multiply 3 * 6 and place the answer in the grid where the lines meet. Use a zero as a place holder.

.

4

3

2

1

2

1

.

6

4

8

2

9

3.42 * 6.9

.

Multiply 2 * 9 and place the answer in the grid where the lines meet.

4

3

2

1

2

1

.

6

4

8

2

1

9

8

3.42 * 6.9

.

Multiply 4 * 9 and place the answer in the grid where the lines meet.

4

3

2

1

2

1

.

6

4

8

2

3

1

9

6

8

3.42 * 6.9

.

Multiply 3 * 9 and place the answer in the grid where the lines meet.

4

3

2

1

2

1

.

6

4

8

2

2

3

1

9

7

6

8

3.42 * 6.9

Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.

.

4

3

2

1

2

1

.

6

4

8

2

2

3

1

9

7

6

8

8

3.42 * 6.9

Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.

.

4

3

2

1

2

1

.

6

4

8

2

2

3

1

9

7

6

8

9

8

3.42 * 6.9

Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.

.

4

3

2

1

2

1

+1

.

6

4

8

2

2

3

1

9

7

6

8

5

9

8

3.42 * 6.9

Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.

.

4

3

2

1

2

1

+1

+1

.

6

4

8

2

2

3

1

9

3

7

6

8

5

9

8

3.42 * 6.9

Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.

.

4

3

2

1

2

1

+1

+1

2

.

6

4

8

2

2

3

1

9

3

7

6

8

5

9

8

3.42 * 6.9

Now you need to place the decimal. Follow the lines until they meet.

.

4

3

2

1

2

1

+1

+1

2

.

6

4

8

2

2

3

1

9

3

7

6

8

5

9

8

3.42 * 6.9

Now drop on the diagonal to place the decimal.

.

4

3

2

1

2

1

+1

+1

2

.

6

4

8

2

2

3

1

9

3

7

6

8

.

5

9

8

3.42 * 6.9

.

4

3

2

1

2

1

+1

+1

2

.

6

4

8

2

2

3

1

9

3

7

6

8

.

5

9

8

That is Soooo Cool!!!

Thanks!

3.42 * 6.9=

23.598