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acute
angle An angle whose measure is less
than 90°. (p. 333) |
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acute
triangle A triangle whose angles
are all acute angles. (p. 342) |
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algebraic
expression A mathematical phrase
involving a variable or variables, numbers,
and operations. (p. 100)
Example:
x - 3 |
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angle
Two rays that have the same endpoint.
(p. 332) |
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area
The number of square units needed to cover
a surface or figure. (p. 548) |
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Associative
Property of Addition Addends
can be regrouped and the sum remains the
same. (p. 22)
Example:
1 + (3 + 5) = (1 + 3) + 5 |
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Associative
Property of Multiplication Factors
can be regrouped and the product remains
the same. (p. 66)
Example:
2 x (4 x 10) = (2 x 4) x 10 |
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average
The number found by adding all the data
and dividing by the number of data. Also,
called the mean.
(p. 282) |
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axis
Either of two lines drawn perpendicular
to each other in a graph. (p. 262) |
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bar
graph A graph that uses bars to show
data.
(p. 262) |
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base
of a polygon The side of a polygon
to
which the height is perpendicular (p. 552) |
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base
of a solid The face
of a solid that is used to
name the solid (p. 595) |
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benchmark
fractions The fractions ,
 ,
 ,
and  .
(p. 402) |
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capacity
The amount a container will hold.
(p. 614) |
center
The point from which all points in a circle
are equally distant. (p. 336) |
centimeter
(cm) A metric unit of length.
100 centimeters equal 1 meter. (p. 534) |
central
angle An angle whose vertex is the
center
of the circle. (p. 336) |
certain
(event) An event that will always
happen.
(p. 296) |
chord
A line segment that connects two points
on
the circle. (p. 336) |
circle
A closed plane figure made up of all the
points the same distance from one point
called the
center. (p. 336) |
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circle
graph A graph in the shape of a circle
that
shows what part of the whole each portion
of the
data represents. (p. 286) |
| circumference
The distance around a circle. (p. 542) |
common
denominator A number that is the
denominator of two or more fractions. (p.
420) |
common
factor A number that is a factor
of two
or more given numbers. (p. 414) |
Commutative
Property of Addition The order
of addends can be changed and the sum remains
the same. (p. 22)
Example:
3 + 7 = 7 + 3 |
Commutative
Property of Multiplication The
order of factors can be changed and the
product
remains the same. (p. 66)
Example:
3 x 5 = 5 x 3 |
compatible
numbers Numbers which are easy
to compute with mentally. (p. 22) |
compensation
Adjusting one number of an
operation to make computations easier and
balancing the adjustment by changing the
other
number. (p. 22) |
composite
number A whole number greater
than one that has more than two factors.
(p. 164) |
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