Transcript Fifth Grade Vocabulary PowerPoint

Fifth Grade
Math Vocabulary
Diameter
The distance across a circle through the center
Any chord of a circle that passes
through the center
Examples
Distributive Property
A number multiplying a sum in parentheses
multiplies each number and then adds the products
It gives the same result as adding first
and then multiplying
A property which multiplies a single term
with two or more terms inside a set of parentheses
Examples
3 x (4 + 2) = (3 x 4) + (3 x 2)
3(7+4)=(3)(7)+(3)(4)
10*(2+18)=(10*2)+(10*18)
Edges
A line segment where 2 faces of a
3-dimensional figure meet
Examples
edge
edges
Equation (Modeling)
A mathematical sentence that shows
that two quantities are equal
To solve an equation,
X
find a value for the variable
X=2
that makes the sentence true
Examples
x+4=5
x=1
X=4
Expanded Form
Writing a number as the sum
of the values of its digits
A way to write numbers by showing
the value of each digit
Expanded form
Examples
=
200 + 70 + 3
935 = 900 + 30 + 5
1,579 = 1,000 + 500 + 70 + 9
Faces
A flat side of a 3-dimensional figure
Examples
faces
face
Improper Fraction
A fraction whose numerator is greater
than or equal to its denominator
Examples
Improper
fraction
5
4
Intersecting Lines
Lines that meet or cross at one common point
Examples
P
Lines EF and GH intersect at point P
The two lines intersect at point (-2,1)
Inverse Operations
Operations that undo each other
Examples
Addition and subtraction are
inverse operations
(undo adding 3 by subtracting 3)
Multiplication and division are
inverse operations
(undo multiplying by 2 by dividing by 2)
To solve an equation use inverse operations:
x+3=5
x+3–3=5–3
x=2
Mean
One of the measures of central tendency
It is found by adding the numbers in a data set and
then dividing by the number of data points
Example
Given six test scores: 85,87,78,88,88 and 96
The mean or average is 87 :
(85+87+78+88+88+96)
6
Metric Units: meter, liter, gram
Units developed in Europe and used in most of the world
Examples
Quantity
Unit
Equivalent
Symbol
length
meter
3.28 feet
m
mass
gram
33.8 fl ounces
g
volume
liter
.035 ounces
l
2 liter bottles
Millions
The unit between thousands and billions
One million is 106  1,000,000
Examples
One million seconds
= 277.76 hours
1,000,000
 60  60 
One million pennies
9, 8 7 6, 5 4 3
Nine million,
eight hundred seventy six thousand,
five hundred forty three.
Mixed Numbers
A number that combines both
a whole number and a fraction
4 9
1 
5 5
3
3
6  6
5
5
19
1
1
 3  3
6
6
6
Parallel Lines
Lines that never cross
and are always the same distance apart
They have the same slope
Examples
Perpendicular Lines
Lines which intersect to form
a right (90 degree) angle
Examples
Plane
A flat surface extending in all directions
A two-dimensional figure
Examples
Coordinate Plane
Polygon: regular/irregular
A closed plane figure for which all sides are
straight line segments
Regular polygons have congruent sides and angles
heptagon
pentagon
triangle
hexagon
square
octagon
decagon
nonagon
Irregular polygons
Proper Fraction
A fraction whose numerator
is less than its denominator
Examples
1
2
1
4
Quadrilateral
A polygon with four sides and four angles
Examples
Radius
A line segment that connects the center of
the circle to a point on the circle
Examples
Ray
A part of a line starting at a particular point, its
endpoint, that extends infinitely in one direction
Examples
An angle is made up of 2 rays
Standard Form
A way to write numbers by using the digits 0-9,
with each digit having a place value
39  3 10  9 1
=
Standard form
x
8 2  64
Exponential form
+
x
Expanded Form
Standard form
+
x
Thousandths
The place value that represents
one thousandth of a whole
It is one tenth of a hundredth and
one hundredth of a tenth
Examples

1
1000
One Thousandth
Types of triangles
(isosceles,equilateral,scalene)
A scalene triangle has no congruent sides
An isosceles triangle has two congruent sides
An equilateral triangle has all three sides congruent
Examples
Scalene
Equilateral
Isosceles
Types of triangles
(right, acute, obtuse)
A right triangle has one right angle
An acute triangle has three acute angles
An obtuse triangle has one obtuse angle
Examples
Acute triangle
Obtuse triangle
Right triangle
Variable
A quantity that can change or that may take
on different values
Examples
x y 4
 2, 000, 000
x
0
1
2
y
4
3
2
Vertex (or vertices)
A corner point of a geometric figure
A point where two sides of a polygon intersect
Examples
Vertices
x-axis, y-axis
The x-axis is the horizontal number line,
the y-axis is the vertical number line,
They form a plane used for graphing points and lines
Examples
Y-axis
y-axis
X-axis
x-axis