Multiplying by 2-digit factors

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# Multiplying by 2-digit factors - PowerPoint PPT Presentation

Multiplying by 2-digit factors. Partial Products. How can we multiply 23 × 15. Draw a box and divide it into four pieces. Write the value of each digit in the number 23 across the top. Then write the value of each digit in the number 15 on the side of the box. . 20. 3. 10. 5.

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## PowerPoint Slideshow about ' Multiplying by 2-digit factors' - yehudi

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Presentation Transcript

### Multiplying by 2-digit factors

Partial Products

How can we multiply 23 × 15
• Draw a box and divide it into four pieces.
• Write the value of each digit in the number 23 across the top. Then write the value of each digit in the number 15 on the side of the box.

20

3

10

5

How can we multiply 23 × 15

3. Multiply the two numbers that meet in each box.

20

3

200

30

10

100

15

5

How can we multiply 23 × 15

4. Add of the 4 products that are in the boxes together.

200

100

30

+ 15

20

3

200

30

10

100

15

5

345

How can we multiply 23 × 15

23 × 15 = 345

200

100

30

+ 15

20

3

200

30

10

100

15

5

345

Multiply 47 × 24

40

7

800

160

140

+ 28

800

140

20

160

28

4

2. Label the box

1128

3. Multiply

Multiply 73 × 46

70

3

2800

420

120

+ 18

2800

120

40

420

18

6

2. Label the box

3358

3. Multiply

Multiply 37 × 18

300

240

70

+ 56

30

7

300

70

10

240

56

8

666

• 63 × 54
• 95 × 37
• 46 × 83
• 27 × 62