33 terms

elapsed time

length of time between two events

positive numbers

numbers greater than zero

numbers to the right of zero on a number line

numbers to the right of zero on a number line

negative numbers

numbers less than zero

numbers to the left of zero on a number line

numbers to the left of zero on a number line

zero

neither negative nor positive

opposites

two numbers whose sum is zero

-3+3=0

-3+3=0

integers

all of the counting numbers and their opposites, as well as the number zero

estimate

a quick way to "get close" to the answer

mixed number

numbers containing fractions

average

number found when the sum of two or more numbers is divided by the number of addends in the sum; also called the mean

factors

the whole numbers that divide a given number without a remainder

prime numbers

numbers that have exactly two factors: the number 1 and the number itself

greatest common factor

the largest whole number that is a factor of two or more given numbers

divisibility tests

help us find the factors of a number - see pg 108 to learn divisibility tests

ratio

the way to describe a relationship between numbers

multiples

product of a natural (called counting by book) number and another number

reduces

to rewrite a fraction in lowest terms

circumference

distance around a circle

diameter

distance across a circle through its center

radius, radii

distance from the center of a circle to the side of a circle

compass

tool for drawing a circle

concentric circles

circles within the same center like a bulls-eye target

plane

a flat surface

intersect

when lines cross

perpendicular

when 2 lines intersect and make square, 90 degree square angles

parallel

when lines do not cross but stay the same distance apart

oblique

lines that intersect but are not perpendicular

Vertex

the point where rays of an angle originate

right angle

the square angles formed by perpendicular lines, rays or segments

obtuse angles

angles that are greater than 90 degree right angles

acute angles

angles that measure less than right, 90 degree angles

least common multiple

the smallest whole number that is a multiple of two or more given numbers

reciprocals

two numbers whose product is 1

ex: 2 x 1/2 = 1

ex: 2 x 1/2 = 1

term (in a fraction)

a number that serves as a numerator or denominator of a fraction