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# Do you remember the 2 methods of multiplication that we know? - PowerPoint PPT Presentation

Do you remember the 2 methods of multiplication that we know?. 1. Karate chop – breaking apart . 7 x 28. (7 x 20) + (7 x 8) = _________. 140. 56. 196. Do you remember the 2 methods of multiplication that we know?. 1. Karate chop – breaking apart .

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## PowerPoint Slideshow about ' Do you remember the 2 methods of multiplication that we know?' - rafiki

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Presentation Transcript

Do you remember the 2 methods of multiplication that we know?

1. Karate chop – breaking apart

(7 x 20) + (7 x 8) = _________

140

56

196

Do you remember the 2 methods of multiplication that we know?

1. Karate chop – breaking apart

2. Standard Form

28x 7

5

56

14

+ 5

196

6

We will learn a 3rdmethod today!

1. Karate chop – breaking apart

2. Compatible numbers

3. Partial Products

28x 7

(7 x 8) + (7 x 20) = _________

28x 7

20 x 7=

140

56

28x 7

+____

56

140

1

9

6

We will learn a 4thmethod today!

1. Karate chop – breaking apart

2. Standard Form

• 3. Partial Products

4. Lattice Method

2

8

1

5

7

1

4

6

9

6

196

2

8

0

1

2

4

6

2

8

1

0

1

2

0

4

6

1

5

7

7

4

6

6

5

756

2

8

1

With a three digit number, your lattice can be set up this way,

2

7

1

2

7

2

or this way.

The commutative property allows you to multiply either way.

8

3 x 321 OR 26 x 134

963 3484

5 x 496 OR 458 x 217

2480 99386

1. Karate chop – breaking apart

2. Compatible numbers

3. Standard Form

• 4. Partial Products

5. Lattice Method