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Math vocabulary
terms and definitions
93
Mathematics
5th Grade
10/28/2010

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Term
even numbers
Definition
numbers that can be divided by 2 without a remainder
Term
sum
Definition
the answer to an addition problem
Term
ray
Definition
a part of a line that begins at a point and continues without end in one direction
Term
remainder
Definition
an amount left after division
Term
counting numbers
Definition
the numbers used to count 1,2,3,4,5,6,7...
Term
decade
Definition
10 years
Term
century
Definition
100 years
Term
millenium
Definition
1000 years
Term
difference
Definition
the answer to a subtraction problem
Term
acute angle
Definition
less than 90 degrees
Term
right angle
Definition
an angle that measures 90 degrees
Term
percent
Definition
a fraction whose denominator of 100 is expressed as a percent sign
Term
1 day
Definition
24 hours
Term
1 minute
Definition
60 seconds
Term
1 hour
Definition
60 minutes
Term
1 year
Definition
12 months
Term
1 year
Definition
365 days
Term
leap year
Definition
366 days
Term
1 week
Definition
7 days
Term
a.m.
Definition
the period of time from midnight to just before noon
Term
p.m.
Definition
the period of time from noon until just before midnight
Term
water freezes at this temperature
Definition
0 degrees celsius
Term
water boils at this temperature
Definition
100 degrees celsius
Term
fahrenheit
Definition
water freezes at 32 degrees; water boils at 212 degrees
Term
common denominators
Definition
denominators that are the same; for example, 2/5 and 3/5 have common denominators
Term
tally mark
Definition
a small mark used to help keep track of a count
Term
ordinal numbers
Definition
numbers that describe position or order
Term
multiple
Definition
a product of a counting number and another number
Term
inverse operations
Definition
operations that undo one another
Term
point
Definition
an exact position
Term
odd numbers
Definition
numbers that have a remainder of one when divided by two
Term
product
Definition
the answer to a multiplication problem
Term
fact family
Definition
a group of three numbers related by addition and subtraction or by multiplication and division
Term
geometry
Definition
mathematical method of learning shapes
Term
term
Definition
a number in a sequence 1,3,5,7,9,11; a number that serves as a numerator or denominator in a fraction
Term
vertical
Definition
upright
Term
line segment
Definition
a part of a line with two distinct endpoints
Term
intersecting lines
Definition
lines that cross
Term
denominator
Definition
the bottom number of a fraction; the number that tells how many parts of a whole
Term
negative number
Definition
a number less than zero
Term
fraction
Definition
a number that names the part of a whole
Term
property of zero for multiplication
Definition
anything times zero is zero
Term
horizontal
Definition
side to side
Term
oblique
Definition
a slanting line
Term
acute triangle
Definition
all three angles are less than 90 degrees
Term
isosceles triangle
Definition
a triangle with at least 2 sides of equal length
Term
similar
Definition
has the same shape but not necessarily the same size
Term
digit
Definition
any of the symbols used to write numbers 0,1,2,3,4,5,6,7,8,9
Term
expanded form
Definition
a way of writing a number that shows the value of each digit
Term
communative property of multiplication
Definition
changing the order of factors does not change their product
Term
factors
Definition
any of the numbers multiplied in a multiplication problem
Term
line
Definition
a straight collections of points extending in the opposite direction without end
Term
addend
Definition
the numbers added in an addition problem
Term
identity property of addition
Definition
the sum of any number and 0 is equal to the initial number
Term
oblique lines
Definition
lines in the same plane that are neither parallel nor perpendicular
Term
straight angle
Definition
measures 180 degrees
Term
sequence
Definition
a lot of numbers according to a certain rule
Term
angle
Definition
the opening that is formed when two line segments or rays intersect
Term
division
Definition
an operation that separates a number into a given number of equal parts or into a number of parts of a given size
Term
communative property of addition
Definition
changing the order of the addends does not change their sum
Term
congruent
Definition
the same size and shape
Term
obtuse angle
Definition
angle more than 90 degrees and less than 180 degrees
Term
obtuse triangle
Definition
one of the angles is obtuse; more than 90 degrees and less than 180 degrees
Term
right triangle
Definition
one of the angles is a right angle-90 degrees
Term
numerator
Definition
of the two numbers of a fraction the number that tells how many parts of the whole are counted
Term
identity property of multiplication
Definition
the product of any number and 1 is equal to the initial number
Term
equation
Definition
a number sentence that uses the symbol = to show that two quantities are equal
Term
perpendicular lines
Definition
two lines that intersect at right angles
Term
parallel lines
Definition
lines that stay the same distance apart; lines that do not cross
Term
mixed numbers
Definition
a whole number and a fraction together
Term
whole numbers
Definition
all the numbers in this segment: 1,2,3,4,...
Term
equilateral triangle
Definition
all the sides are all the same length
Term
scalene triangle
Definition
with three sides of different lengths
Term
factor
Definition
a whole number that divides another whole number without a remainder
Term
polygon
Definition
a closed flat shape with straight sides
Term
vertex
Definition
a point of an angle, polygon, or solid where two or more lines meet
Term
integers
Definition
the set of counting numbers, their opposites, and zero, the zero, the members of the set
Term
parallelogram
Definition
a quadrilateral that has two pairs of parallel sides
Term
rhombus
Definition
a parallelogram with all four sides of equal length
Term
topezoid
Definition
a quadrilateral with exactly one pair of parallel sides
Term
trapezium
Definition
quadrilateral with no parallel sides
Term
triangle
Definition
polygon with three sides
Term
quadrilateral
Definition
polygon with four sides
Term
pentagon
Definition
polygon with 5 sides
Term
hexagon
Definition
polygon with six sides
Term
heptagon
Definition
polygon with seven sides
Term
polygon with eight sides
Definition
octagon
Term
decagon
Definition
polygon with ten sides
Term
dodecagon
Definition
polygon with 12 sides
Term
associative property of addition
Definition
the grouping of the addends does not affect their sum
Term
dividend
Definition
a number that is divided
Term
divisor
Definition
a number by which another number is divided
Term
quotient
Definition
the answer to a division problem
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