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2nd Quarter Math Vocabulary

Terms in this set (58)

eighths or 1/8
eight equal parts that make one whole
fact family
a group of addition facts and subtraction facts that all use the same three numbers; a group of multiplication facts and division facts that all use the same three numbers
fraction
a number that tells the number of parts (numerator) or a whole (denominator)
half or 1/2
one of two equal parts
inverse operation
the opposite way to work with numbers; for example, subtraction is the inverse, or opposite, operation of addition
multiples of 10
every counting number multiplied by 10; 10,20,30, and so on
pentagon
a shape with five straight sides and five angles
polygon
a closed, flat figure bounded by line segments
sixths or 1/6
six equal parts that make one whole
thirds or 1/3
three equal parts that make one whole
whole
all parts together; complete
fraction bar
the line between numerator (top number) and denominator (bottom number)
addition
an operation that combines two or more addends to find the sum
difference
the answer to a subtraction problem
equal
having the same value
even numbers
every number divisible by 2; every number ending in 0,2,4,6 or 8
fourths or 1/4
the ordinal number that tells the number four position
hexagon
a shape with six stright sides and six angles
mathematician
a person who studies the science of numbers and number operations
minus
a word used between numbers that means to subtract the second number from the first number
odd number
every number not divisible by 2, every number ending in 1,3,5,7 or 9
pair
two items that are usually together such as shoes and gloves
parallelogram
a shape with four stright sides that has two pairs of parallel lines
square
a shape with four sides, all equal in length, and four right angles
subtract
to count backward; take away
trapezoid
a shape with four straight lines but only one pair of parallel sides
triangle
a shape with three straight sides and three angles
angle
the figure formed by two lines extending from a common endpoint
congruent
having the same size and shape
endpoints
small dots at the beginning and the end of a line segment
estimate
to make a good guess about value or measurement based on given information
fewest
the least number of all
greatest
more than all the others
inch
a small customary unit to measure length, height, or distance; in.
least
less than all the others
length
the distance from one end to the other end
line segment
a straight path usually marked with two endpoints
longer
having more lenght
rectangle
a shape with four straight sides and four right angles
right angle
angle that measures 90°
shorter
having less length or height
width
a measurement from side to side
commutative property of addition
a+b=b+a the order that you add numbers does not change their sum 2+3=3+2
identity element for addition and subraction
zero; when we add zero to a number or subtract zero from a number, the answer will always be the number
ones' digit
the digit farthest to the right in a whole number; in a single-digit number it is the only digit
tens' digit
the digit second from the right in a whole number, in 27, the 2 is the tens' digit
addend
one of the number being combined to find the sum, addend + addend = sum
data
information
decrease
to become smaller; to count backward
digit
any of the symbols 0,1,2,3,4,5,6,7,8,9 used to write numbers
elapsed time
time that has passed from one point in time to another
graph
a chart that shows information using symbols, points, bars or lines
hour
a measurement of time equal to 60 minutes
hour hand
the shorter arrow on the clock that shows the hour
increase
to become larger; to count forward
minute hand
the longer arrow on a clock that shows the number of minutes before and after the hour
sequence
an order or pattern
sum
the answer to an addition problem
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