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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.

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Presentation Transcript
slide2
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

slide3

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

slide4

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

slide5
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

slide7

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

slide8

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

slide9

+

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 problem1

+

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 problem2

+

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

5

5

6

6

767

x 89

6903

6136

0

68,263

slide13

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

slide14

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.

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