Basic math formulas
Find here a comprehensive list of basic math formulas commonly used when doing basic math computation
Average formula:
Let a
_{1},a
_{2},a
_{3},......,a
_{n} be a set of numbers, average = (a
_{1} + a
_{2} + a
_{3},+......+ a
_{n})/n
Fractions formulas:
Converting an improper fraction to a mixed number:
Formula for a proportion:
In a proportion, the product of the extremes (ad) equal the product of the means(bc),
Thus, ad = bc
Percent:
Percent to fraction: x% = x/100
Percentage formula: Rate/100 = Percentage/base
Rate: The percent.
Base: The amount you are taking the percent of.
Percentage: The answer obtained by multiplying the base by the rate
Consumer math formulas:
Discount = list price × discount rate
Sale price = list price − discount
Discount rate = discount ÷ list price
Sales tax = price of item × tax rate
Interest = principal × rate of interest × time
Tips = cost of meals × tip rate
Commission = cost of service × commission rate
Geometry formulas:
Perimeter:
Perimeter of a square: s + s + s + s
s:length of one side
Perimeter of a rectangle: l + w + l + w
l: length
w: width
Perimeter of a triangle: a + b + c
a, b, and c: lengths of the 3 sides
Area:
Area of a square: s × s
s: length of one side
Area of a rectangle: l × w
l: length
w: width
Area of a triangle: (b × h)/2
b: length of base
h: length of height
Area of a trapezoid: (b
_{1} + b
_{2}) × h/2
b
_{1} and b
_{2}: parallel sides or the bases
h: length of height
volume:
Volume of a cube: s × s × s
s: length of one side
Volume of a box: l × w × h
l: length
w: width
h: height
Volume of a sphere: (4/3) × pi × r
^{3}
pi: 3.14
r: radius of sphere
Volume of a triangular prism: area of triangle × Height = (1/2 base × height) × Height
base: length of the base of the triangle
height: height of the triangle
Height: height of the triangular prism
Volume of a cylinder:pi × r
^{2} × Height
pi: 3.14
r: radius of the circle of the base
Height: height of the cylinder
Have any questions about the basic math formulas? Send me an email
here
and ask me any questions you want about these basic math formulas

Jul 03, 20 09:51 AM
factoring trinomials (ax^2 + bx + c ) when a is equal to 1 is the goal of this lesson.
Read More
New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.