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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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Draw the array and label its dimensions.arraylabeldimensions 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 = 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 = 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 6 How 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 = Next

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What is the perimeter? The perimeter is how many units surround the shape Next

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What is the perimeter? Its like the fence that goes around the outside of the shape 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? Next

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What is the perimeter? 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 =16 The perimeter is Next

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ListList all the factors of the area.factors 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 List means to write as many as you can think of. Back

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FactorsFactors = the numbers you multiply to get a productproduct Back

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ProductProduct = 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 = 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 = 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?primecomposite PrimePrime = the area has only two factors: 1 and itself Composite Composite = the area has more than 2 factors Next

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Prime 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: 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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Back

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Repeated Addition = Next

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Draw additional arrays with the same area and label their dimensions.additionallabel dimensions Next

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Additional: Additional: more of the same thing Label: Label: write the numbers to show what it means Dimensions: 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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