standard algorithm tuesday, september 16 2014. goal i will be able to connect our diagrams and the...
TRANSCRIPT
Standard Algorithm Tuesday, September 16 2014
GoalI will be able to connect our diagrams and the distributive property to partial products of the standard algorithm without renaming.
Multiply by Multiples of 100
21x 4008400
312x30093,600
2,314x200462,800
Multiply using the Area Model
43x12 43
2
10
2x43= 86
43x10= 430
430+86= 516
Multiply using an area Model
243x12200 40 3
2
10
200x 2=400
40x2= 80
3x2=6
10x2002000
40x10=400
10x3=3-
2,000 400 400 80 30 + 6 2,916
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? 3.2x 21= 67.2
http://www.seas.Harvard.edu/news-events/press-release/tough-gel-stretches-to-21-times-its-length
Journal Entry
9/16 Area Model and Standard Algorithm
64x73
We will solve these problems using both an area model and the standard algorithm
65 X73 19545504745
70 3
4
60
70x4= 2804x3= 12
60x70= 4200 6x3= 18
814x39800 10 4
9
30
9x800=7200 9x10= 909x4= 36
800x30= 24000 30x10= 30030x4= 120
31746
624x82
624 x 82
1248 49920 51168
Problem SetYou 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.
Exit TicketDraw an are model and solve the problem using the standard algorithm
78x42= 3276
783x42= 32,886