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Measurement

Measurement. Area. By Rosi Barron. <--- To Teacher Page. •. Fifth Grade Measurement: . Measuring. Area. •. Tips:. -Teachers, please read through the whole. presentation prior to the activity. -Each activity is meant to be used in addition to. your classroom teaching.

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Measurement

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  1. Measurement Area By Rosi Barron <--- To Teacher Page

  2. • Fifth Grade Measurement: Measuring Area • Tips: -Teachers, please read through the whole presentation prior to the activity. -Each activity is meant to be used in addition to your classroom teaching. -Each activity includes a journal component. • Objectives: TSW determine the appropriate method to find the area of a figure.

  3. Area: The number of square units needed to cover a surface. Methods of finding Area: Rectangle - opposite sides are equal - Area = length x width ORA = l x w. Triangle - a 3-sided figure - Area = ½ x base x height OR A = ½ x b x h. Parallelogram - a quadrilateral with opposite sides parallel & congruent - a combination of a rectangle and 2 triangles - move 1 triangle to make a larger rectangle. <--- To Teacher Page

  4. Choose the appropriate method to find the area of each of these figures. Figure A: a rectangle with a length of 12 cm. and a height of 6 cm. A. Figure B: a triangle with a height of 8 cm. and a base of 5 cm. B. Record your answers-----> Remember your answers must be labeled cm². Why?

  5. Answers: 12 cm. Figure A is a rectangle so the area would equal to its length x its width OR A = 12 x 6 SO A = 72 cm² A. 6 cm. Figure is a triangle so the area would equal its base x its height OR A = ½ x 5 x 8 A = ½ x 40 A = 20 cm² B. More practice --->

  6. Find the area of this Parallelogram. Remember, it is a combination of a rectangle and 2 triangles. How do you begin? <---------- 15 cm. -----------> Does this help? 8 cm. <------ 10 cm. ------> One more HINT -------->

  7. <---------- 15 cm. -----------> Separate the parallelogram into 3 pieces, 2 triangles & 1 rectangle. Now move 1 triangle so you will have just 1 large rectangle. c. 8 cm. b. a. <------ 10 cm. ------> Each piece has been labeled. c. b. a.

  8. Did you change this . . . <---------- 15 cm. -----------> c. 8 cm. b. a. <------ 10 cm. ------> <---------- 15 cm. -----------> c. 8 cm. b. To this? -----> a. <------ 10 cm. ------> What was that method of finding area for this figure? ---------->

  9. Rectangle - opposite sides are equal - Area = length x width ORA = l x w. <---------- 15 cm. -----------> c. Area = 15 cm. X 8 cm. Area = 120 cm² 8 cm. b. a. <------ 10 cm. ------> Figure out another way of finding out the area of this parallelogram. HINT: Think of them as 3 separate objects or 2 separate objects. Answers may vary.

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