### opposites

two numbers that are the same distance from 0 on a number line, but in opposite directions

### order of operations

1.work inside grouping symbols2.multiply and divide from left to right3.add and subtract from left to right

### divisible

one whole number is xxxx by a second whole number if the remainder is 0 when you divide the 1st number by the 2nd

### greatest common factor

of two or more numbers is the greatest number that is a factor of all the numbers

### least common denominator

of two or more fractions is the least common multiple of their denominators

### least common multiple

of two or more numbers is the least multiple that is common to all the numbers (lcm of 3 and 4 is 12)

### prime number

a whole number with exactly two factors, 1 and the number itself. the number 1 is neither prime or composite

### rational number

a number that can be written as a quotient of two integers, where the divisor is not 0. 2/5, -6, 3 1/2,

### repeating decimal

if the same block of digits in a decimal repeats without end, the decimal is a xxx

### benchmark

a xxxx is a convenient number used to replace fractions that are less than 1. 7/8 ---> 1, 4/9--->1/2

### precision

the xxxx of a measurement refers to its degree of exactness. The marks on a scale or other intrument tell you the xxxx that is possible

### reciprocal

two numbers are xxxx if their product is 1. To divide by a fraction, multiply by its XXXX

### cross products

for two ratios, the xxxxx are found by multiplying the denominator of one ratio by the numerator of the other ratio

### indirect measurement

you can use XXX to measure distances that are difficult to measure directly. Use proportions and similar triangles

### scale drawing

a XXX is an enlarged or reduced drawing of an object that is similar to the actual object

### similar polygons

2 polygons are XXX if 1)corresponding angles have the same measure, and 2)the lengths of corresponding sides form equal ratios

### markup

the difference between the selling price and the orig. cost, or the store's cost, of an item is called the XXX

### percent of change

the XXX is the percent a quantity increases or decreases from its original amount. amount of change/original amount = percent of change/100

### polygon

a closed plane figure with sides formed by three or more line segments. the sides only meet at their endpoints

### vertical angles

formed by two intersecting lines and are opposite each other. xxx angles have equal measures.

### cylinder

has two congruent parallel bases that are circles. the height of a xxx is the length of a perpendicular segment that joins the bases

### hypotenuse

in a right triangle, the two shortest sides are legs. the side oppposite the 90 angle is the hypotenuse

### irrational number

a number that cannot be written as a ratio of two integers. As decimals, xxx numbers neither terminate or repeat

### prism

a 3-dim figure with 2 parallel and congruent polygonal faces, called bases. the other faces are rectangles.

### pythagorean theorem

in any right triangle, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse

### volume

xx of a 3 dim. figure is the number of cubic units needed to fill the space inside the figure

### pyramid

3 dim. figure with triangular faces that meet at one point,vertex, and a base that is a polygon. named for the shape of the base

### parallelogram

quadrilateral with both pairs of opposite sides parallel 3 special types:rectangle,rhombus,square

### line

a series of points that extend in two opposite directions without end. You name a line by any two points on the line or a lowercase letter.

### ray

is part of a line with one endpoint and all the points of the line on one side of the endpoint. you name a ray using two points, starting with the endpoint