Do you remember the 2 methods
of multiplication that we know?
1. Karate chop – breaking apart
7 x 28
140
56
196
(7 x 20) + (7 x 8) = _________
Do you remember the 2 methods
of multiplication that we know?
1. Karate chop – breaking apart
2. Standard Form
7 x 28
5
28
x 7
1966
56
14 + 5
We will learn a 3rd method today!
1. Karate chop – breaking apart
2. Compatible numbers
3. Partial Products
7 x 28
28
x 7
7 x 28
(7 x 8) + (7 x 20) = _________
28
x 7
56
20 x 7=140
7 x 28
28
x 7
56
140
+____
1 96
We will learn a 4th method today!
1. Karate chop – breaking apart
2. Standard Form
3. Partial Products
4. Lattice Method
7 x 28
2
8
1
1
5
4
9
6
6
196
7
27 x 28
2
8
0
1
4
6
2
27 x 28
2
0
0
7
8
1
1
4
1
4
5
6
5
6
6
756
2
7
28 X 127
2
8
1
2
7
With a three
digit number,
your lattice can
be set up this
way,
127 x 28
1
2
7
2
or this way.
8
The commutative
property allows
you to multiply
either way.
Now you try one using lattice.
Show your work!!!
3 x 321
963
OR
26 x 134
3484
Now you try one more using any
method!
5 x 496
2480
OR
458 x 217
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