# Math Live Area and Perimeter: Assessment Task

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1 Area and Perimeter: Assessment Task Grade: 5 Strand: Shape and Space (Measurement) Outcome: 2 SPECIFIC LEARNER OUTCOMES Shape and Space (Measurement SS2 Design and construct different rectangles, given either perimeter or area, or both (whole numbers), and make generalizations. PROCESSES Communication (C), Connections (CN), Mental Mathematics and Estimation (ME), Problem Solving (PS), Reasoning (R), Technology (T), Visualization (V) C, CN, PS, R, V EVIDENCE the student has achieved the outcomes Each student will: Measure the effect of changing one dimension (length or width) of a rectangle on its perimeter. Through patterning, recognize that for every unit changed, the perimeter changes by twice that amount. Use information gathered through measuring to generalize the effect of changing one dimension of a rectangle by any given amount on its perimeter. Measure the effect of changing one dimension (length or width) of a rectangle on its area. Through patterning, recognize that for every unit changed, the area changes by that number of units multiplied by the other dimension. Use this information to generalize the effect of changing one dimension of a rectangle by any given amount on its area. Page 1 of 18

2 TEACHER NOTES: In this assessment task, students will be asked to demonstrate their understanding of the effect of changing one dimension (length or width) of a rectangle on both its perimeter and area. They will draw a rectangular dog pen on grid paper and then explain in words the effect of decreasing the length of the dog pen by 1 unit, 2 units, and 3 units on its perimeter and on its area. Students then generalize the relationship between changing one dimension of the rectangle to its perimeter and its area. Students should have easy access to grid paper and tiles. Changing either the length or width of a rectangle changes the perimeter of that rectangle as follows: Change in perimeter = (units of length or width changed) x 2 Length = 5 units Width = 3 units Perimeter = 16 units Decreasing the length by 2 units decreases the perimeter by 2 units x 2 or 4 units. Perimeter = 16 units 4 units = 12 units Length = 5 units Width = 3 units Perimeter = 16 units Decreasing the width by 2 units decreases the perimeter by 2 units x 2 or 4 units. Perimeter = 16 units 4 units = 12 units Changing either the length or width of a rectangle changes the area of that rectangle as follows: Change in area = (units of length changed) x (the width), or Change in area = (units of width changed) x (the length) Length = 5 square units Width = 4 square units Area = 20 square units Decreasing the length by 2 units decreases the area by 2 units x width or 8 units 2. Area = 20 units 2 8 units 2 = 12 units 2 Length = 5 square units Width = 4 square units Area = 20 square units Decreasing the width by 2 units decreases the area by 2 units x length or 10 units 2. Area = 20 units 10 units = 10 units 2 Page 2 of 18

3 Area and Perimeter: Assessment Task You decide to build a sidewalk from your house to your garage. In order to do this, you must make the dog pen smaller. Dog Pen Original Dog Pen Garage 1. The original dog pen covered an area of 24 m 2. Draw what the original dog pen could have looked like and write the length and width. Choose your own dimensions. Calculate the perimeter of the original dog pen. Show all your work. Length = Width = = 1 m 2 Page 3 of 18

4 Renovation of Dog Pen 2. How does decreasing the length of the dog pen by 1 m affect the perimeter of the dog run? How does decreasing the length of the dog pen by 2 m affect the perimeter of the dog run? 3 m? Show how you arrived at your answers. 3. In general, how does changing the length of any rectangle change its perimeter? Use diagrams and words to justify your answer. 1 1 Diagnostic Mathematics Program: Numeration Division II Page 4 of 18

5 Area and Perimeter: Scoring Guide Level Criteria Wow! Yes Calculates the effect of changing one dimension (length or width) of a rectangle on its perimeter and area Questions #2 and #4 Accurately calculates the decrease in perimeter and area when the length of the dog pen is decreased and clearly states this change using the correct standard units of measure Generalizes the effect of changing the dimensions of a rectangle on its perimeter Question #3 States specifically that the perimeter of a rectangle will increase or decrease by twice the number of units as the change in length States specifically that the perimeter of a rectangle will decrease by twice the number of units as the change in length Generalizes the effect of changing the dimensions of a rectangle on its area Question #5 States specifically that the area of a rectangle will increase or decrease by the change in length times the width as the length is changed States specifically that the area of a rectangle will decrease by the change in length times the width as the length is changed Yes, but No, but Calculates the decrease in perimeter and area when the length of the dog pen is decreased and states this change without using standard units of measure Incorrectly calculates the decrease in perimeter and area when the length of the dog pen is decreased or fails to state this change States that the perimeter of a rectangle will decrease or increase by two meters for every unit change in length States generally that the perimeter simply gets smaller or bigger as the length decreases or increases States that the perimeter of a rectangle will decrease or increase by a specific number of square metres as the length is changed States generally that the area simply gets smaller or bigger as the length is changed Insufficient / Blank No score awarded due to insufficient evidence of student learning based on the requirements of the assessment task No score awarded due to insufficient evidence of student learning based on the requirements of the assessment task No score awarded due to insufficient evidence of student learning based on the requirements of the assessment task Page 5 of 18

6 DOG PEN DILEMMA - Student Assessment Task Wow! You decide to build a sidewalk from your house to your garage. In order to do this, you must cut into the fencing for your dog pen and make the dog run smaller. Dog Pen Garage Original Dog Pen 1. The original dog pen covered an area of 24 m 2. Draw what the original dog pen could have looked like and write the length and width. Choose your own dimensions. Calculate the perimeter of the original dog pen. Show all your work. Page 6 of 18

7 Renovation of Dog Pen 2. How does decreasing the length of the dog pen by 1 m affect the perimeter of the dog run? How does decreasing the length of the dog pen by 2 m affect the perimeter of the dog run? 3 m? Show how you arrived at your responses. Wow! 3. In general, how does changing the length of any rectangle change its perimeter? Use diagrams and words to justify your response. Page 7 of 18

8 4. How does decreasing the length of the dog pen by 1 m affect the area of the dog pen? What happens to the area when you decrease the length by 2 m? 3 m? Show how you arrived at your responses. Wow! 5. In general, how does changing the length of any rectangle change its area? Use diagrams and words to justify your response. Page 8 of 18

9 DOG PEN DILEMMA - Student Assessment Task Yes You decide to build a sidewalk from your house to your garage. In order to do this, you must cut into the fencing for your dog pen and make the dog run smaller. Dog Pen Garage Original Dog Pen 1. The original dog pen covered an area of 24 m2. Draw what the original dog pen could have looked like and write the length and width. Choose your own dimensions. Calculate the perimeter of the original dog pen. Show all your work. Page 9 of 18

10 Renovation of Dog Pen 2. How does decreasing the length of the dog pen by 1 m affect the perimeter of the dog run? How does decreasing the length of the dog pen by 2 m affect the perimeter of the dog run? 3 m? Show how you arrived at your responses. Yes 3. In general, how does changing the length of any rectangle change its perimeter? Use diagrams and words to justify your response. Page 10 of 18

11 4. How does decreasing the length of the dog pen by 1 m affect the area of the dog pen? What happens to the area when you decrease the length by 2 m? 3 m? Show how you arrived at your responses. Yes 5. In general, how does changing the length of any rectangle change its area? Use diagrams and words to justify your response. Page 11 of 18

12 DOG PEN DILEMMA - Student Assessment Task Yes, but You decide to build a sidewalk from your house to your garage. In order to do this, you must cut into the fencing for your dog pen and make the dog run smaller. Dog Pen Garage Original Dog Pen 1. The original dog pen covered an area of 24 m 2. Draw what the original dog pen could have looked like and write the length and width. Choose your own dimensions. Calculate the perimeter of the original dog pen. Show all your work. Page 12 of 18

13 Renovation of Dog Pen 2. How does decreasing the length of the dog pen by 1 m affect the perimeter of the dog run? How does decreasing the length of the dog pen by 2 m affect the perimeter of the dog run? 3 m? Show how you arrived at your responses. Yes, but 3. In general, how does changing the length of any rectangle change its perimeter? Use diagrams and words to justify your response. Page 13 of 18

14 Yes, but 4. How does decreasing the length of the dog pen by 1 m affect the area of the dog pen? What happens to the area when you decrease the length by 2 m? 3 m? Show how you arrived at your responses. 5. In general, how does changing the length of any rectangle change its area? Use diagrams and words to justify your response. Page 14 of 18

15 No, but DOG PEN DILEMMA - Student Assessment Task You decide to build a sidewalk from your house to your garage. In order to do this, you must cut into the fencing for your dog pen and make the dog run smaller. Dog Pen Garage Original Dog Pen 1. The original dog pen covered an area of 24 m2. Draw what the original dog pen could have looked like and write the length and width. Choose your own dimensions. Calculate the perimeter of the original dog pen. Show all your work. Page 15 of 18

16 Renovation of Dog Pen 2. How does decreasing the length of the dog pen by 1 m affect the perimeter of the dog run? How does decreasing the length of the dog pen by 2 m affect the perimeter of the dog run? 3 m? Show how you arrived at your responses. No, but 3. In general, how does changing the length of any rectangle change its perimeter? Use diagrams and words to justify your response. Page 16 of 18

17 No, but 4. How does decreasing the length of the dog pen by 1 m affect the area of the dog pen? What happens to the area when you decrease the length by 2 m? 3 m? Show how you arrived at your responses. 5. In general, how does changing the length of any rectangle change its area? Use diagrams and words to justify your response. Page 17 of 18

18 4. How does decreasing the length of the dog pen by 1 m affect the area of the dog pen? What happens to the area when you decrease the length by 2 m? 3 m? Show how you arrived at your responses. 5. In general, how does changing the length of any rectangle change its area? Use diagrams and words to justify your response. Page 18 of 18

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