Miss Emilys 3rd Grade

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Miss Emilys 3rd Grade Mathematicians Lesson 3rd
Grade Review
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PART 1 Geometry
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Geometry Vocabulary

• Polygons
• Congruent
• Equilateral Triangle
• Isosceles Triangle
• Scalene Triangle
• Symmetry
• Angle

• Perimeter
• Area
• Plane
• Point
• Line
• Ray

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Polygons
A flat closed figure with 3 or more sides
polygons are classified by the number of sides
QUADRILATERAL 4 sided polygon
TRIANGLE 3 sided polygon
Congruent the same length or measurement
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HEXAGON 6 sided polygon
OCTAGON 8 sided polygon
PENTAGON 5 sided polygon
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Equilateral Triangle
A triangle with 3 congruent sides
5 cm
5 cm
5 cm
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Isosceles Triangle
A triangle with 2 congruent sides
4 cm
4 cm
3 cm
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Scalene Triangle
A triangle with 0 or NO congruent sides
5 cm
3 cm
4 cm
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Congruentfigures of the same size and shape are
congruent
CONGRUENT
NOT CONGRUENT
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Symmetry a figure has a line of symmetry if it
can be folded in half and the 2 halves are
congruent
Equilateral triangle 3 lines of symmetry
Circle unlimited lines of symmetry
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Geometry Question Which shape has a 1 line of
symmetry?
A
B
C
D
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WRONG ANSWER Try Again
BACK TO QUESTION
REVIEW Click here!
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REVIEW
a figure has a line of symmetry if it can be
folded in half and the 2 halves are congruent
BACK TO QUESTION
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RIGHT ANSWER!
ONE LINE OF SYMMETRY
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Perimeter
the perimeter of a polygon is the distance around
or the sum of all the sides
5 cm
7 cm
7 cm
5 cm
The perimeter is 5 cm 7 cm 5 cm 7 cm 24
cm
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Area
The area is the number of square units that cover
a figure without overlapping.
The area of the rectangle is 12 square units
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Plane
a collection of points that forms a flat,
continuous, and unending surface
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Line
a line is a straight, continuous, and unending
collection of points
POINT
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Ray
a ray is a part of a line that has one endpoint
and continues in the other direction without end
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Angle
an angle is 2 rays with one common endpoint
called the vertex
VERTEX
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PART 2 Measurement
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Customary Measurement
the customary system of measurements is used in
the United States to measure LENGTH, CAPICITY
and WEIGHT
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Length
to measure length we use inches, feet, yards and
miles
12 inches 1 foot 3 feet 1 yard 36 inches 1
yard 5,280 feet 1 mile 1,760 yards 1 mile
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Capacity
to measure capacity we use cups, pints, quarts
and gallons
2 cups 1 pint 2 pints 1 quart 4 quarts 1
gallon
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Weight
to measure weight we use ounces and pounds
16 ounces 1 pound
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Metric Measurement
the metric system of measurement is used in other
countries to measure LENGTH, CAPACITY and MASS
this system is based on 10 and powers of 10
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MILI .001 CENTI- .01 DECI- .1 DEKA- 10 HECTO-
100 KILLO- 1,000
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PART 3 Basic Fractions
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NUMERATOR
3 4
DENOMINATOR
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Numerator
the top number in the fraction, the numerator
tells you how many parts are shaded
2 4
2 out of 4 boxes are purple
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Denominator
the bottom number in the fraction, the
denominator shows how many equal parts the whole
is divided into
2 4
the square was divided into 4 equal parts
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Fraction Question What is the fraction of the
blue region?
A. 1/4 B. 1/2 C. 3/4 D. 2/3
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Try Again Wrong Answer
BACK TO QUESTION
REVIEW
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REVIEW
NUMERATOR
1 4
shaded part
equal parts
DENOMINATOR
BACK TO QUESTION
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RIGHT ANSWER!
3 4
3 out of the 4 squares were BLUE!
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ANGLE
SCALENE TRIANGLE
US MEASUREMENTS
AREA
REMEMBER
SYMMETRY
METRIC SYSTEM
POLYGONS
EQUILATERIAL TRIANGLE
NUMERATOR
ISOSCELES TRIANGLE
FRACTIONS
CONGRUENT
RAY
PERIMETER