Seek The Multiplication Treasure

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# Seek The Multiplication Treasure - PowerPoint PPT Presentation

Seek The Multiplication Treasure. 2009-2010. Copy this problem. Multiply the factors in the top row by the digit in the ones place in the second factor. 1. 342 x 23. 3 4 2 x 3. 10. 2. 6. Since 4 • 3=12 Carry the 1 and write down the 2. Multiply 4 • 3. Multiply 3 • 2.

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### Seek The Multiplication Treasure

2009-2010

Copy this problem. Multiply the factors in the top row by the digit in the ones place in the second factor.

1

342

x 23

3 4 2

x 3

10

2

6

Since 4 • 3=12 Carry the 1 and write down the 2

Multiply 4 • 3

Multiply 3 • 2

Multiply 3 • 3 + 1

Now you will multiply the top factor by the tens digit in the second factor. In this problem, you multiply by the 2 in the tens place or 20.

342

x 23

3 4 2

x 3

2

10

2

6

Since the 2 actually represents 2 tens or 20, we will want to put a zero in the ones place in the second row of our work before we multiply anything else.

342

x 23

3 4 2

x 3

2

10

2

6

0

Multiply the 2 times every digit in the top factor and write the answer in the second row below the line.

342

x 23

3 4 2

x 3

2

10

2

6

6

8

4

0

There are two digits in the second factor.

one

two

Since there are two digits in the second factor there should be two rows of numbers to add to get the product.

342

x 23

3 4 2

x 3

2

10

2

6

6

8

4

0

There are two digits in the second factor.

one

two

+

Since the number of digits matches the number of rows, we now add the rows together to get the product of the original problem.

342

x 23

3 4 2

x 3

2

10

2

6

6

8

4

0

+

Since the number of digits matches the number of rows, we now add the rows together to get the product of the original problem.

342

x 23

3 4 2

x 3

2

10

2

6

6

8

4

0

7

8

6

6

+

Work the following problem following the steps used in the previous problem.

1

914

x 48

7312

3656

0

43,872

+

Work the following problem following the steps used in the previous problem.

5

5

6

6

767

x 89

6903

6136

0

68,263

Are you up to the adventure of finding the multiplication treasure? Remember X (multiplication) marks the spot!

Choose from the following problems, at least two from each column. Solve them on Multiplication Graph Paper and pass in to your teacher. (Don’t forget to write your name on your paper.)

• 32 X 26
• 28 X 18
• 46 X 22
• 53 X 34
• 125 X 23
• 532 X 16
• 208 X 58
• 246 X 31
• 53 X 344
• 2,125 X 24

To Review the Demonstration again, click on the Treasure Chest.