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MEDIAN
the value that falls in the middle of the set
MODE
the value that appears most often
Average Speed Formula
Total Distance / Total Time
Avarage of Consecutive Numbers
Avarage of Smallest Number + Avarage of Largest Number / 2
Count Consecutive Numbers
Highest Number - Lowest Number + 1
Sum Consecutive Numbers
Avarage X Number of Terms
Percent Formula
Part = Percent X Whole
Percent Increase/Decrease
Amount of Increase{Decrease} / Original Whole X 100%
Multiples of 2
Last digit is even
Multiples of 3
Sum of digits is a multiple of 3
Multiples of 4
Last two digits are a multiple of 4
Multiples of 5
Last digit is 5 or 0
Multiples of 6
Sum of digits is a multiple of 3 and the last digit is even
Multiples of 9
Sum of digits is a multiple of 9
Multiples of 10
Last digit is 0
Multiples of 12
Sum of digits is a multiple of 3 and the last two digits are a multiple of 4
RANGE
Highest Value - Lowest Value
MEDIAN
the value that falls in the middle of the set. If the set is even, avarage the two in the middle.
MODE
the value that appears most often. If there is a tie, there are more than one mode.
ACTUAL NUMBER
Set each ratio equal to the other and then cross-multiply.
AREA of a Triangle
1/2 the Base X Height
SPECIAL RIGHT TRIANGLES
{3-4-5} {5-12-13} {30-60-90} {45-45-90}
AREA of a Parallelogram
Base X Height
AREA of a Trapezoid
Avarage of Parallel Sides X Height
CIRCUMFERENCE of a Circle
2 X pi X r
AREA of a Circle
pi X r squared
AREA of a Sector
1 X (n{degree of central angle} / 360) X (pi X r squared)
SLOPE
RISE{change in y} / RUN{change in x}
MULTIPLY/DIVIDE POWERS
add/subtract the exponents
RAISE a POWER to a POWER
multiply the expontents
POWERS with Base Zero
equal zero; zero raised to zero is undefined
POWERS with Exponent of Zero
equal 1
VOLUME of a Cylinder
pi X r squared X Height
VOLUME of a Sphere
4/3 X pi X r cubed
x of y cards