a letter or symbol that stands for one or more numbers

Ex: x + 9

a mathematical phrase that uses only numbers and operation symbols.  It does not have an equal sign

Ex: 28 + 12

an estimation strategy in which you change one addend to a multiple of ten and then adjust the other addend to keep the balance

Ex: 328 + 546 = (328 + 2) + (546 - 2)

     = 330 + 544

= 874

an expression that includes at least on variable

Ex: b - 9

decimals that name the same amount

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one of 1,000 equal parts

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one of 100 equal parts

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property(rule) that states that when the grouping of addends is changed, the sum is the same

Ex: (5 + 8) + 4 = 5 + (8 + 4)

property(rule) that states that when the order of two addends is changed, the sum is the same

Ex: 4 + 5 = 5 + 4

the answer to a division problem

24 divided by 4 = 6

a number multiplied by another number to find a product

7 x 6 = 42

a number with exactly 2 factors (1 and itself)

(Ex: 3, 7, 11, 23, etc.)

a number having more than 2 factors

(Ex: 9, 12, 20, 18, etc.)

fractions that name the same amount

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simplest form (lowest terms)

a fraction in which the numerator and denominator have only 1 as a common factor

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the greatest factor that 2 or more numbers have in common

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a whole number and a fraction

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when a number is a multiple of 2 or more numbers

2 - 2,4,6,8,10,12, 14, 16, 18,20

           5  -     5,    10,          15,        20

the product of a given number and another number

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math steps that undo each other or are opposite

(Ex: 7 - 4 = 3 and 3 + 4 = 7)

(Ex:4 X 6 = 24 and 24 divided by 6 = 4)

to borrow 1 from the whole number in a mixed number and change it into a fraction; then add it to the fraction

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the smallest common multiple of 2 or more numbers

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a number with one or more numbers to the right of a decimal point

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the number being divided

(Ex: 24 divided by 6 = 4)

the number being divided by

(24 divided by 6 = 4)

a number that tells how many times a base is to be multiplied

5² (2 is the exponent)

the top number of a fraction

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the bottom number of a fraction

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equal, as in fractions that represent equal amounts

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a whole number and a fraction

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a fraction that has been reduced so that the only common factor of both the numerator and denominator is 1

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familiar numbers used for reference

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when a fraction has been reduced to simplest form

(Ex: 10/20 = 1/2)

the order of operations in math

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the set of whole numbers and their opposites

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one part of 100

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one of two fractions whose product is 1

                     Ex:2  and 5

                          5        2

a process in which a number is changed or altered according to formal rules such as those of addition, subtraction, multiplication, or division

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any integer less than zero 

( -4, -8, -10)

any integer greater than zero

( +4, +7, 8, 2)

the distance of an integer from zero on a number line

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lines in a plane that are always the same distance apart; they never

intersect

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two lines that intersect to form right angles

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a triangle with exactly two congruent sides

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a triangle which has 2 equal sides

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a triangle with 3 acute angles

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a triangle that has 1 obtuse angle

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a triangle with 3 equal sides

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a triangle whose sides are all a different length

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a triangle with 1 right angle

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a pair of numbers used to locate a point on a grid

(2,6)  (-2, 4)  (8, -3) etc.

the point where two axes of a coordinate plane intersect (0,0)

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the horizontal (left to right) number line on a coordinate plane

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the vertical (up and down) number line of a horizontal plane

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the first number in an ordered pair, that tells the distance to move right or left from (0,0)

(2, 4)  (-3, 6)

the second number in an ordered pair, that tells the distance to move up or down from (0,0)

(2,4)  (3, -6)

a relationship between two quantities in which one quantity depends on the other

Ex:  y=3x + 2

 y=x-1

the distance around a polygon

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the number of square units needed to cover a surface

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the measure of the space occupied by a 3-dimensional object as measured in cubic units

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the difference between the greatest number and the least number in a set of data

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the middle number in a set of data that are arranged in order

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the average of a set of numbers, found by dividing the sum of the set by the number of addends

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the number or item that occurs most often in a set of data

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