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prime numbers

2, 3, 5, 7, 11, 13, 17, 19 , 23, 29, 31, 37, 39, 41, 43, 47...

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LCD - lowest common denominator

Cross out any prime factor in the second denominator that already appears in the first denominator. then multiply the rest.

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Average

sum of all the numbers in the set divided by the number of elements in the set.

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Median

the middle value in a set containing odd numbers; a set with even numbers it is the average of the two middle terms.

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Mode

the value that appears the most often in the set

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Associative Property

(a+b)+c=a+(b+c)

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distributive property

ab+ac=a(b+c) OR ab-ac=a(b-c)

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Differences of Squares

a^2 - b^2 = (a+b) (a-b)

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Fractions or decimals less than 1 raised to a power

will result in a number smaller than the original number

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supplementary angles

two angles that form a straight line

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acute angle

angle is greater than 0 but less than 90 degrees

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complementary angles

two angles form a 90 degree angle

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vertical angles

Happens when two lines intersect, vertical angles are equal

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Perimeter of a rectangle

P=2l+2w

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Area of a circle

A=pi(r^2)

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Circumference

C=pi(d) or 2(pi)r

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Length of an arc

Arc=(x/360)x2(pi)r

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Surface area

S=6a^2: sum of the areas of all faces

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