1. Standard Algorithm
Tuesday, September

2. Goal
I will be able to connect our diagrams and the distributive property to partial products of the standard algorithm without renaming.

3. Multiply by Multiples of 100
21x 400
8400
312x300
93,600
2,314x200
462,800

4. Multiply using the Area Model
43x12 43
2x43= 86 2 10
430+86= 516
43x10= 430

5. Multiply using an area Model
243x12
2,000
400 80 30
+ 6
2,916 2 10
200x 2=
400
40x2= 80
3x2=6
40x10=
400
10x3= 3-
10x200
2000

6. Word Problem of the Day
Scientists are creating a material that may replace damaged cartilage in human joints. This hydrogel can stretch to 21 times its original length. If a strip of hydrogel measures 3.2 cm, what would its length be when stretched to capacity? x 21= 67.2
21-times-its-length

7. Journal Entry
9/16 Area Model and Standard Algorithm

8. 64x73
We will solve these problems using both an area model and the standard algorithm
70x4= 280 65
X73
195
4550
4745 4 60
4x3= 12
60x70= 4200
6x3= 18

9. 814x39 9 30
9x800=7200
9x10= 90
9x4= 36
31746
30x4= 120
800x30= 24000
30x10= 300

10. 624x82
624
x 82
1248
49920
51168

11. Problem Set You may work with one person on the problem set
I will be calling groups to my back table.
Once you are finished please move your number to your new activity.

12. Exit Ticket
Draw an are model and solve the problem using the standard algorithm
78x42= 3276
783x42= 32,886