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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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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

2. Standard Form


7 x 28
7 x 28

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


7 x 281
7 x 28

28x 7


7 x 282
7 x 28

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

28x 7

20 x 7=

140

56


7 x 283
7 x 28

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


7 x 284
7 x 28

2

8

1

5

7

1

4

6

9

6

196


27 x 28
27 x 28

2

8

0

1

2

4

6


27 x 281
27 x 28

2

8

1

0

1

2

0

4

6

1

5

7

7

4

6

6

5

756


28 x 127
28 X 127

2

8

1

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

2

7


127 x 28
127 x 28

1

2

7

2

or this way.

The commutative property allows you to multiply either way.

8



Now you try one more using any method
Now you try one more using any method!

5 x 496 OR 458 x 217

2480 99386


Now we know 5! Turn to your partner. Which is your favorite and why?

1. Karate chop – breaking apart

2. Compatible numbers

3. Standard Form

  • 4. Partial Products

5. Lattice Method


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