an array a day mrs. amatangelo. a ray is what you learn about in geometry. this is a ray. a b this...
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An Array a Day
Mrs. Amatangelo
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A ray is what you learn about in geometry. This is a ray.
A B
This is NOT an ARRAY.
Next
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A ray gun.
A stingray.
A ray of sunshine.
These are rays:
They are NOT ARRAYS.
Ray from Ghostbusters
An X-ray Next
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An
is when you make rows and columns.
ARRAY
Next
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Arrays are all around you.
Next
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Next
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Next
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Draw the array and label its dimensions.An array with the dimensions of 6 by 2 would look like this:
To label the dimensions, write a 2 to show 2 columns, and a 6 to show 6 rows.
2
6
or for a 2 by 6, like this:
Next
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An
is when you make rows and columns.
ARRAY
Back
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Dimensions means how many rows and how many columns
Back
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Label means to write the number that shows how many are in each row and column.
Back
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Write a multiplication sentence:
There are 6 rows of 2 so the
multiplication sentence is:
6 * 2 = 12
2
6
Next
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What does it mean?
The multiplication sentence
6 * 2 = 12
means
there are
6 rows
with
2 in each row.
2
6
Next
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Write a division sentence.
12 / 6 = 22
6
Next
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What does it mean?
Take 12 squares and put them into
6 groups with
2 in each group.
2
6
Next
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What is the area?
The area is:
how many squares
are inside the shape.
2
6How much carpet would I need if I covered the floor with carpet instead?
How many tiles do I need to cover a floor?
Next
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What is the area?
There are 12 squares inside the shape,
so the area is 12 squares.
2
6
Next
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What is the area?
To find the area,
multiply the number of rows
by the number of columns.
6 * 2 = 12
2
6
Next
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What is the perimeter?
The perimeter is how many units surround
the shape.
2
6 6
2
Next
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What is the perimeter?
It’s like the fence that goes around the outside of the
shape.
2
6 6
2
Next
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What is the perimeter?
The question, “What is the
perimeter?” is asking,
How long is the fence that goes
around the outside of the
shape?
2
6 6
2
Next
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What is the perimeter?
2
6 6
2
This ‘fence’ is
6 squares long
and
2 squares wide,
with
6 more squares long,
and
2 more feet wide. Next
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What is the perimeter?
To find the perimeter, add
all the lengths
and
all the widths of the sides.
6+2+6+2=16
The perimeter is
16
2
6 6
2
Next
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List all the factors of the area.
1, 2, 3, 4, 6, 12
are the factors of the area 12,
because:
1 * 12 =12
2 * 6 = 12
3* 4 = 12 Next
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List means to write as many as you can think of.
Back
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Factors = the numbers you multiply to get a product
Back
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Product = the answer you get when you multiply
Back
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List all the factors of the area.
1 and 12
are factors of the area 12,
because:
1 * 12 = 12
12
1
Next
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List all the factors of the area.
3 and 4
are the factors of the area 12,
because:
3 * 4 = 12
4
3
Next
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List all the factors of the area.
2 and 6
are factors of the area 12,
because:
2 * 6
Next
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List all the factors of the area.
The factors are the same numbers you used to find the area.
(length * width = area)
Next
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Is the area prime or composite?
Prime = the area has only two factors: 1 and itself
Composite = the area has more than 2 factors
Next
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Prime1
11
11
1
A shape with an area of 11 is prime. The only numbers you can multiply to get 11 are 1 and 11.
1x11=11
Next
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Some other prime arrays are:1
7
3
2
1
1
1
135
1
Back
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Composite
A shape with the area of 12 is composite because 12 has more than 2 factors.
Next
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12
12
6
4
3
3
4
6
2
1
12
Back
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Repeated Addition
2+2+2+2+2+2=12
+ + + + +
Next
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Draw additional arrays with the same area and label their
dimensions.
Next
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12
12
6
4
3
3
4
6
2
1
12
Next
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Additional: more of the same thing
Label: write the numbers to show what it means
Dimensions: the size
how big it is
the length and the width
Next
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So what?• How large of an area do we need for every student to sit at a
desk? • How many 25 student classes will fit in an area the size of
the floor in the multi-purpose room?• How much newspaper do I need to cover an area the size of
the ceramics table?• How much paint do I need to cover an area the size of the
walls in my room?• If one student needs a 9 foot square area to jump rope, how
large of an area would 25 students need?• The swings need a mat under them. How large should the
mat be to cover the area under the swings?• 5 friends brought their sleeping bags to a sleepover. If every
sleeping bag covers a 12 foot area, what size tent should we use?
• Each family member rakes the leaves from a 100 square foot area. How many family members are needed to rake a yard with a 1000 square foot area?
Next
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Credits:• http://www.thebuyer.net/quantitylots.htm• http://www.cutflowerfarm.com/grow.html• http://www.etch.com/firsts.cfm• http://www.robertedselblog.com/index.php/2006/06/page/2/• http://www.robertedselblog.com/index.php/2006/06/page/2/• http://www.bradleysalmanac.com/2004_10_01_archive.htm• http://www.istockphoto.com/file_closeup/?id=2266727&refnum=617351• http://www.komar.org/projects/crawlspace/basement-carpet/• http://www.superherodesigns.com/journal/archives/000743.html• http://www.garagecreations.com/about.html• http://www.army.mod.uk/51bde/rtc/index.htm• http://piopicotag.wordpress.com/2007/08/13/dyf-design-your-own-cupcake/• http://www.waymarking.com/cat/details.aspx?f=1&guid=c988388d-1347-48f6-ad5b-a355e2103eb6• http://commons.wikimedia.org/wiki/Image:Ferrari_parking_lot_at_USGP_2005.jpg• http://blog.paxholley.net/category/movies/• http://www.starships.com/SF_Image15.HTML• http://www.absolutedivers.com/stingray_city.htm• http://www.med.harvard.edu/JPNM/TF03_04/Jan11/Unknown.html• http://www.thejaggythistle.co.uk/jun07pettedlip.htm• http://www.deckrails.com/Fence.html• http://www.esopuslibrary.org/bookm.htm• http://www.knowledgeshopatlanta.com/Toastmasters.cfm• http://www.petdiscounters.com/mc_images/product/detail/asa_c098_cat_tent_red_black.jpg• http://www.cirquepassion.com/Chapiteau%20Cirque%20Passion%20black%20swirly%20edge.PNG• http://www.unit5.org/kjhs/imc/images/newspaper.jpg• http://www.empowerment.state.ia.us/common/images/jumping.gif• http://www.haltondsb.on.ca/images/ForestTrailAssembly.JPG• http://www.danzfamily.com/archives/blogphotos/06/563-drew-painting.jpg• http://www.osi.state.ok.us/SchoolFurniture/student2.htm