It's Arrays to the Top
Destination: Estimation
There no Place Value like Home
Break it Down
100
A group of columns and rows with the exact same number of objects.
What is an Array
100
Round DOWN if... Round UP if...
the digit is below 5 the digit is 5 or above
100
i have four thousands i have nine hundreds i have five tens i have seven ones What is my STANDARD FORM?
4,957
100
What three multiplication sentences can I use to solve the following... 39 x 9 =
30 x 9 = 9 x 9 =
200
An array that you see everyday - what is the multiplication sentence of it? (Bonus 100)
egg carton - 2 x 6, 3 x 8 parking lot packs of sodas (same as egg carton) pencil boxes crayons C.D. shelves Bookshelves. Calendars
200
Times you use estimation
- Do you have enough money? - about how much? - not asking for an exact answer
200
What is the value of the hundreds? 9,258,179
1 = 100
200
Mrs. Zuniga's class and Mr. De Avila had a multiplication match that lasted 47 minutes. Every minute, the students answered 9 multiplication facts. What multiplication sentences can be used to break the problem down? How many did they answer in the entire 47 minutes?
40 x 7 = 280 7 x 7 = 49 329 multiplication facts
300
Show me an array that represents 8 x 9
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
300
The students in Mr. De Avila’s class earns approximately 27 De Avila dollars a day. Do they earn more than 100 De Avila dollars a week?
30 x 5 = 150 - yes they do
300
How many commas should I have and how would you read me? 572594740
572,594,740 - two commas five hundred seventy two million, five hundred ninety four thousand, seven hundred forty
300
Lucita loves reading chapter books, especially the ones with skeletons, and zombies. Over the summer Lucita read 9 books with 209 pages each. How many pages did Lucita read. - You MUST break down the problem to earn the points.
209 x 9 = 200 x 9 = 1,800 0 x 9 = 0 9 x 9 = 81 1,800 + 81 = Lucita read 1,881 pages!
400
Stacy's mom bought her Justin Beiber stickers for her B.E.E. book. Each page had 32 stickers. What would an array of Stacy's stickers look like?
2 x 16 4 x 8
400
Yaili lives in the city. In her neighborhood there are 8 main streets with 32 houses in each street. Approximately how many houses are in Yaili's neighborhood?
Estimate 32 ~ 30 30 x 8 = 240 Approximately 240 houses
400
What is the largest 3-digit number you can make with the digits? 1 2 3 4 5
543 five hundred forty three
400
What are the partial factors for the following multiplication sentence... 462 x 8
400 x 8 = 3200 60 x 8 = 480 2 x 8 = 16
500
Garcia knows a lot of songs. Curious about just how many he knows he decided to write them ALL down. He ended up with 144 songs total! He wants to put them in a nice array. What array can he put them in?
12 x 12 72 x 2 48 x 3 36 x 4 24 x 6 18 x 8 16 x 9
500
A can of beans costs 29 cents. A bag of lentils costs 42 cents. Estimate which is cheaper: to buy 8 cans of beans or to buy 5 bags of lentils.
Beans - 1 can = 29 ~ 30 cents 30 x 8 cans = 240 cents or $2.40 approximately Lentils - 1 bag 42 cents ~ 40 40 x 5 = 200 cents or $ 2.00 approximately LENTILS are CHEAPER.
500
What is the largest 4-digit number you can make with a 2 in the hundreds place? 1 2 3 4 5 6 7
276
500
Reymundo is a rock star at making masterpiece giant puppets with popscicle sticks. For each giant puppet he makes he uses 862 popscicle sticks. The Austin Museum of Art wanted to display his work and asked him to make 7 puppets. How many popscicle sticks would Reymundo need? What multiplication sentences will you use? What partial factors will you add up?
862 x 7 = 1.) 800 x 7 = 5,600 (partial factor) 2.) 60 x 7 = 420 (partial factor) 3.) 2 x 7 = 14 (partial factor) 5,600 + 420 + 14 = 6,034 popscicle sticks
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