2, 3, 5, 7, 11, 13, 17, 19 , 23, 29, 31, 37, 39, 41, 43, 47...
LCD - lowest common denominator
Cross out any prime factor in the second denominator that already appears in the first denominator. then multiply the rest.
sum of all the numbers in the set divided by the number of elements in the set.
the middle value in a set containing odd numbers; a set with even numbers it is the average of the two middle terms.
the value that appears the most often in the set
ab+ac=a(b+c) OR ab-ac=a(b-c)
Differences of Squares
a^2 - b^2 = (a+b) (a-b)
Fractions or decimals less than 1 raised to a power
will result in a number smaller than the original number
two angles that form a straight line
angle is greater than 0 but less than 90 degrees
two angles form a 90 degree angle
Happens when two lines intersect, vertical angles are equal
Perimeter of a rectangle
Area of a circle
C=pi(d) or 2(pi)r
Length of an arc
S=6a^2: sum of the areas of all faces
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