distributive property Multiplying a number
by a sum is the same as multiplying the
number by each addend of the sum and
then adding the products.
dividend The number to be divided.
24 44 2 4
dividend
divisibility rules A rule that tells whether
one number is divisible by another.
divisible One number is divisible by
another if it can be divided by that
number and yield no remainder.
divisor The number by which the dividend
is divided.
36 99 3 6
divisor
E
edge The line segment where two faces of
a solid figure meet.
elapsed time The amount of time between
two given times.
endpoint The point at the end of a line
segment or ray.
equation (See number sentence.)
equilateral triangle A triangle whose three
sides are congruent.
equivalent decimals Decimals that name
the same amount. 0.4 0.40
equivalent fractions Different fractions that
name the same amount.^12 ^24
estimate An approximate answer; to find
an answer that is close to an exact answer.
event A set of one or more outcomes.
F
face A flat surface of a solid figure
surrounded by line segments.
fact family A set of related addition and
subtraction facts or multiplication and
division facts that use the same numbers.
factors Two or more numbers that are
multiplied to give a product.flip (reflection) The movement of a figure
over a line so that the figure faces in the
opposite direction.
fluid ounce (fl oz) A customary unit of
capacity; 8 fluid ounces 1 cup.
formula A rule that is expressed by using
symbols.
fraction A number that names part of a
whole or part of a set.
front-end estimation A way of estimating
by using the front, or greatest, digits to find
an approximate answer.
function A quantity whose value depends
on another quantity.
G
gram (g) A metric unit of mass;
1000 g1 kg.
greatest common factor (GCF) The
greatest number that is a factor of two
or more products.
H
half-turn symmetry A figure that matches
its image when it is turned halfway around
has half-turn symmetry.
hexagon A polygon with six sides.
I
identity property (property of one) The
product of one and a number is that number.
impossible An event that cannot occur, or
has a probability of 0.
improper fraction A fraction whose
numerator is greater than or equal to
its denominator.
inch (in.) A customary unit of length;
12 in.1 ft.
intersecting lines Lines that meet or cross
at a common point.
inverse operations Mathematical
operations that undoeach other, such as
addition and subtraction or multiplication
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