Math Formulas Flashcards
Percent decrease formula
Actual decrease/original amount * 100
Probability formula
number of desired outcomes/number of possible outcomes
Combinations formula
n! / k! (n-k)!
Prime numbers
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
The probability that an event occurs is equal to?
1 minus the probability that the event does not occur.
permutation formula
n!/ (n-k)!
odd + odd =
even
even + odd
odd
odd x odd
odd
even x odd
even
When asked to find the probability that multiple dependent events occur, how do you do this?
calculate the probability of each and then multiply the probabilities
Area of a Rectangle =
Base × Height
Area of a square=
Base × Height
Area of Triangle =
½(Base × Height)
Area of Parallelogram =
Base × Height
Area of Trapezoid
½(Base1 + Base2) × Height
Area of Circle =
π(radius)2 = πr2
Circumference=
2πr
exterior angles of a triangle=
360
sum of any 2 sides of a triangle is?
greater
Pythagorean theorem
a^2 + b^2 = c^2
Pythagorean triplets
3: 4:5
5: 12:13
7: 24:25
8: 15:17
9: 40:41
how to find the sum of terms
average x number of terms
Volume of a cube
S^3
Volume of a cylinder
πr2h
Volume of a rectangular solid
L x W x H
Area of a rectangular solid
2 (lw + lh + wh)
Area of a cylinder
2pieR2 + 2pierh
Area of a cube
6a^2
