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3rd Grade Unit 6– Geometry& Area/Perimeter
PREASSESSMENT
* I can identify a square as a quadrilateral.
* I can identify a rectangle as a quadrilateral.
* I can identify a rhombus as a quadrilateral.
- Which statement is true about a square?
Squares have five sides.
Squares have only 3 angles.
Squares are open shapes.
Squares have 4 equal sides.
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- Solve the riddle: I am a four sided plane figure with four right angles. I have two long sides that are the same length as each other and two short sides that are the same length as each other. What am I?
circle
rectangle
square
rhombus
- Which shape is a rhombus, but is NOT a square?
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* I can compare shapes to show that they share attributes, and that these common attributes can define a larger category of shapes. (Quadrilaterals)
- The following shapes belong to which category?
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rectangles
triangles
quadrilaterals
open figures
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* I can identify that a square unit is used to measure the area of a plane figure.
- Which of these would you measure in square units?
covering the playground
putting a frame around a picture
the distance from Mexico to Canada
tying a ribbon around your waist
* I can use square units, without gaps or overlaps, to measure the area of a plane figure.
- What is the area of the rectangle below?
20 square units
10 square units
24 square units
12 square units
* I can measure area by counting square centimeters, square meters, square inches and square feet.
- What is the area of the rectangle below?
14 square inches
46 square inches
48 square inches
68 square inches
* I can recognize that addition can be used to find the total area of rectilinear figures.* I can use the distributive property of multiplication to find the area of a rectangle that I have tiled.
- The diagram shows Tagen’s bedroom. Each unit square is 1 square meter. What set of equations will show the total area of her bedroom?
(3 x 4) + (6 x 10) = 72 square meters
(3 + 4) x (10 + 5) = 105 square meters
10 x 3 = 30 square meters
10 x 10 = 100 square meters
* I can find the area of a rectangle using tiles and relate it to multiplication. This means that area can be represented by multiplying unit length x width.
- A sports fan has banners from all of his favorite teams. He has ordered a new banner to complete his collection. How much room will he need to have in order for the banner to fit on his wall?
Complete the table to find the area of Banner D.
Banner / Length(in meters) / Width
(in meters) / Area
(in square meters)
A / 2 / 1 / 2
B / 2 / 2 / 4
C / 2 / 4 / 8
D / 2 / 10 /
* I can multiply to find area of rectangles using whole numbers to solve real world problems.
- Ben wants to buy grass seed for his backyard. The diagram shows Ben’s backyard. What is the area of Ben’s backyard?
12 square meters
16 square meters
18 square meters
24 square meters
* I can find the perimeter of a polygon given the side lengths.
- Find the perimeter of the triangle below.
8 cm
10 cm
16 cm
20 cm
* I can find the perimeter of a polygon with an unknown side length.
- What is the perimeter of the square?
6 inches
1 inch
4 inches
8 inches
* I can express (write) the area of each equal part as a unit fraction of the whole shape.
- Farmer Dell planted his garden in the shape of a rectangle. Below is a diagram of his garden. What fraction of the garden is corn?
* I can use mental estimation strategies to see if my answer is reasonable.
* I can measure area by counting units that I created.
- Estimate the area of the figure shown below.
1 square unit
7 square units
9 square units
12 square units