Decomposing for Area and Perimeter
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1 Decomposing for rea and erimeter th Grade CST: NS. th Grade CST: F. ) Which of the following shows the number 0 factored into prime numbers? 9) Which equation below represents the area () of the rectangle in square centimeters? ) 0 B) 0 cm 9 cm C) 0 D) ) = 9 B) = 9 C) = ( ) + ( 9) D) = ( ) + ( 9) What is the perimeter of this rectangle? Give two other examples of rectangles that have the same perimeter, but different areas. th Grade CST: MG. Other ) store has a rectangular parking lot that is 00 feet by 0 feet. What is the perimeter of the parking lot? How many rectangles have equal perimeters and areas? ) 0 feet B) 0 feet C) 00 square feet D),000 square feet Objective: Students will use decomposing to find different dimensions for the given perimeter or area of rectangles. age of MCC@WCCUSD 0/0/
2 nswer Key th Grade CST: NS. th Grade CST: F. ) Which of the following shows the number 0 factored into prime numbers? D) 9) Which equation below represents the area () of the rectangle in square centimeters? 9 cm cm B) = 9 What is the perimeter of this rectangle? Give two other examples of rectangles that have the same perimeter, but different areas. = cm + cm + 9 cm + 9 cm = 08 cm Some examples of other rectangles: cm x cm, cm x cm, cm x cm th Grade CST: MG. Other ) store has a rectangular parking lot that is 00 feet by 0 feet. What is the perimeter of the parking lot? B) 0 feet Two rectangles: Rectangle : units units Rectangle : units units age of MCC@WCCUSD 0/0/
3 Decomposing for rea and erimeter Level: th Grade MG. MG. MG. Measurement and Geometry Standard Set.0 Students understand perimeter and area. Recognize that rectangles that have the same area can have different perimeters. Understand that rectangles that have the same perimeter can have different areas. Understand and use formulas to solve problems involving perimeters and areas of rectangles and squares. Use those formulas to find the areas of more complex figures by dividing the figures into basic shapes. Measurement and Geometry Standard Set.0 Students demonstrate an understanding of plane and solid geometric objects and use this knowledge to show relationships and solve problems. MG. Identify congruent figures. NS. NS.* Number Sense Standard Set.0 Students know how to factor small whole numbers. Understand that many whole numbers break down in different ways. Know that numbers such as,,, 7 and do not have any factors except and themselves and that such numbers are called prime numbers. Objective: Students will decompose by either factors or addends to find different dimensions of rectangles when given the area or perimeter. Vocabulary- erimeter: peri- a Greek prefix meaning around; linear measurement of all sides of a polygon, one dimensional measurement (use ruler, unit cubes to reinforce linear dimension). units units units units The perimeter of this rectangle is units + units + units + units = 0 units. Note: Focus on using addition only before moving to the use of the perimeter formula. age of MCC@WCCUSD 0/0/
4 rea: the two-dimensional measurement of space within a perimeter (or circumference). rea of a rectangle can be determined by multiplying its base by its height (use multiplication chart or arrays to reinforce two dimensions). Note: Discuss with students base x height vs length x width (which will be seen in texts and on assessments). Base x height is the preferred terminology for area; this differentiates between finding area and finding volume, when the formula base x height x width is used. units units units units The area of this rectangle is units units = units squared, or square units. Congruent ( ): two geometric figures that have the same size (=) and shape (~). 7 units units units units These two trapezoids are congruent. units units units 7 units Concept Development: rea Common Errors: When given a rectangle and asked to create another with different perimeters but the same area, many students will create a congruent rectangle. units units Given units units Created Since the rectangles are congruent, they will have the same area and the same perimeter, which means the dimensions are not different. age of MCC@WCCUSD 0/0/
5 erimeter of given rectangle: units + units + units + units = 0 units. erimeter of created rectangle: units + units + units + units = 0 units. Some students will find other dimensions, but their findings can be limited. units units 8 units units MG.: Recognize that rectangles that have the same area can have different perimeters. Demonstrate/model using graph paper, and have the students do the same with the You Tries. Our task is to find all possible (whole number) dimensions for a rectangle with an area of square units. We will do this by factoring. First, decompose the given area ( square units) to prime, and then list all the factors in numeric order; since is a factor of every number, be sure to include it, too. :,,,, Since the area is the product of the base and height, we can use the factors listed to make all the different base and height combinations for a rectangle with an area of square units. Start with a base of, and then multiply all the other factors listed to find the height for a rectangle with an area of square units. rea ( )( ) = ( unit )( unit ) = square units = unit + unit + units + units = 0 units The area is square units, and the perimeter is 0 units. This rectangle has the dimensions of unit x units. age of MCC@WCCUSD 0/0/
6 Now, keeping numeric order, see if there can be a base of for this rectangle. Since we have a factor of we can use that for the base. Now multiply the other factors together to get the other dimension (the height) for a rectangle with an area of square units. rea ( )( ) = ( units)( units) = square units = units + units + units + units = 8 units The area is square units, and the perimeter is 8 units. the dimensions of units x units. Now, keeping numeric order again, let s see Can there be a base of? [Yes] We ll multiply the other factors together to find the other dimension (the height) for a rectangle with an area of square units. rea ( )( ) = ( units)( 8 units) = square units = units + units + 8 units + 8 units = units The area is square units, and the perimeter is units. (Repeat these steps, keeping numeric order.) Now, staying in order, can we multiply any factors together to get a base of? [Yes, x ] Now we multiply the other factors together to get the height for our rectangle. rea ( )( ) = ( units)( units) = square units = units + units + units + units = 0 units the dimensions of units x 8 units. the dimensions of units x units. What is the area of this rectangle? [ square units.] What is the perimeter of this rectangle? [0 units.] Now for the next rectangle, can there be a base of? [No, is not a factor of ] So we ll check if there can be a base of re there any factors that we can multiply to create a base the dimensions of units x units. age of MCC@WCCUSD 0/0/
7 of? [Yes, x ] Now multiply the rest of the factors together to get the height for a rectangle with an area of square units. rea ( )( ) = ( units)( units) = square units = units + units + units + units = 0 units What is the area of this rectangle? [ square units.] What is the perimeter of this rectangle? [0 units.] Continue following these orderly steps until all possible rectangle dimensions are found see rectangles below. rea ( )( ) = ( 8 units)( units) = square units the dimensions of 8 units x units. = 8 units + 8 units + units + units = units What is the area of this rectangle? [ square units.] What is the perimeter of this rectangle? [ units.] rea ( )( ) = ( units)( units) = square units the dimensions of units x units. = units + units + units + units = 8 units rea? [ square units.] erimeter? [8 units.] rea ( )( ) = ( units)( unit ) = square units = units + units + unit + unit = 0 units the dimensions of units x units. age 7 of MCC@WCCUSD 0/0/
8 rea? [ square units.] erimeter? [0 units.] Since we have a factor of for our height, kept numeric order, and used all factors in each rectangle created, we have found all possible dimensions for a rectangle with square units. Show all rectangles side by side so that students can easily see the changes in dimensions and make comparisons. You Try Use factoring to find all possible dimensions for a rectangle with an area of 0 square units :,,, This rectangle has the dimensions of unit x 0 units. rea ( )( ) = 0 ( unit )( 0 units) = 0 square units = unit + unit + 0 units + 0 units = units = 0 square units, = units rea ( )( ) = 0 ( units)( 0 units) = 0 square units = units + units + 0 units + 0 units = units = 0 square units, = units age 8 of MCC@WCCUSD 0/0/
9 rea ( )( ) = 0 ( units)( units) = 0 square units This rectangle has the dimensions of units x 0 units. = units + units + units + units = 8 units = 0 square units, = 8 units the dimensions of units x units. rea ( )( ) = 0 ( units)( units) = 0 square units = units + units + units + units = 8 units = 0 square units, = 8 units the dimensions of units x units. rea ( )( ) = 0 ( 0 units)( units) = 0 square units = 0 units + 0 units + units + units = units = 0 square units, = units the dimensions of 0 units x units. age 9 of MCC@WCCUSD 0/0/
10 rea ( )( ) = 0 ( 0 units)( unit ) = 0 square units = 0 units + 0 units + unit + unit = units This rectangle has the dimensions of 0 units x unit. = 0 square units, = units Frontloading: Review your rectangles and discuss with a partner how to find the perimeter. [dd, then double/multiply by ] Leads into using the distributive property and formula. Concept Development: erimeter Since we have reinforced using addition for finding the perimeter, we now can decompose by addends to find rectangles with the same perimeter but different areas. Standard MG.: Rectangles with the same perimeter have different areas. We can use what we know about rectangles and decompose by addends to prove this standard. When given that Rectangle has a perimeter of units, our task is to find all the possible dimensions of a rectangle with a perimeter of units. What if we started decomposing to +? Discuss with your neighbor what the sides of the rectangle would be. llow time for discussion and drawing their ideas, then ask student volunteers to share their thinking. [Dimensions would be x 7 because + only shows two sides, so each number needs to be divided in half.] = units + units = unit + unit + 7 units + 7 units = unit 7 units = 7 units squared the dimensions of unit x 7 units. age 0 of MCC@WCCUSD 0/0/
11 Remember to keep numeric order and you will be able to find all the (whole number) different dimensions for a rectangle with a perimeter of. sk students to discuss amongst themselves if it is possible for a rectangle to have fractions/decimals as its dimensions; support and give examples. [Yes; sample response:. inches for the base and. inches for the height.] Confirm this with students, and share that since the standard for th grade regards whole numbers, we will only focus on using whole numbers while we are developing the concept. We started decomposing the perimeter of units in our first rectangle as +. Remember that we want to keep order, and use only whole numbers as the base and height, which means that we should decompose the perimeter of our second rectangle as + ; the next step is to decompose each of these addends in half, as + only represents two sides of the rectangle. = units + units = units + units + units + units = units units = units squared This rectangle has dimensions of units x units. Let s decompose the dimensions for rectangle, following the same steps for rectangles and. We ll start the decomposing with a base of and height of 0, then take half of each addend. = units + 0 units = units + units + units + units = units units = units squared This rectangle has the dimensions of units x units. Now we ll follow the same steps to find the dimensions for rectangle. What base should we start with? [8, then divide in half] age of MCC@WCCUSD 0/0/
12 = 8 units + 8 units = units + units + units + units This rectangle has the dimensions of units x units. = units units squared How should we start decomposing for the fifth rectangle? [0 +, then decompose each addend in half.] = 0 units + units = units + units + units + units the dimensions of units x units. = units units = units squared How will we start decomposing for the sixth rectangle? [ +, then decompose each addend in half.] = units + units = units + units + units + units the dimensions of units x units. = units units = units squared How do we start the seventh rectangle? [ +, then decompose each addend in half.] units = 7 units + 7 units + unit + unit = 7 units unit = 7 units squared the dimensions of 7 units x unit. age of MCC@WCCUSD 0/0/
13 Have students discuss the relationship and the patterns they see in the rectangles; make and display posters. While working in groups of or, challenge them to come up with different ways to write the perimeter and share their ideas. [ = (b) + (h); = (b + h)] Discuss the perimeter formula. Have students use the perimeter formula for all the rectangles. erimeter Solutions: = ( unit ) + ( 7 units) = ( units) + ( units) = ( units) + ( units) = units + units = units + units = units + 0 units 7 = ( units) + ( units) = ( units) + ( units) = ( units) + ( units) = 8 units + 8 units = 0 units + units = units + units = ( 7 units) + ( unit ) + units You Try Decompose by addends to find all possible dimensions for a rectangle with a perimeter of units. Then, use the perimeter formula to solve. = units + units = unit + unit + units + units = unit units = units squared age of MCC@WCCUSD 0/0/
14 = units + 0 units = units + units + units + units = units units = 0 units squared = units + 8 units = units + units + units + units = units units = units squared = 8 units + units = units + units + units + units = units units = units squared = 0 units + units = units + units + units + units = units units = 0 units squared age of MCC@WCCUSD 0/0/
15 = units + units = units + units + unit + unit = units unit = units squared erimeter Solutions = ( unit ) + ( units) = ( units) + ( units) = ( units) + ( units) = units + units = units + 0 units = units + 8 units = ( units) + ( units) = ( units) + ( units) = ( units) + ( unit ) = 8 units + units = 0 units + units = units + units Concluding Notes: While the concepts and skills are not too challenging, and the use of formulas is not difficult for students to grasp, the opportunity to decompose numbers and manipulate them into given areas and perimeters helps to develop a strong number sense foundation. age of MCC@WCCUSD 0/0/
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