Average expression:

Let a1. a2. a3. …… . an be a set of Numberss. mean = ( a1 + a2 + a3. +……+ an ) /n

Fractions expressions:

Converting a assorted figure to an improper fraction:

Converting an improper fraction to a assorted figure:

Formula for a proportion:

In a proportion. the merchandise of the extremes ( ad ) equal the merchandise of the agencies ( bc ) .

Therefore. ad = bc

Percentage:

Percentage to fraction: x % = x/100

Percentage expression: Rate/100 = Percentage/base

Rate: The per centum.

Base: The sum you are taking the per centum of.

Percentage: The reply obtained by multiplying the base by the rate

Consumer math expressions:

Discount = list monetary value ? price reduction rate

Sale monetary value = list monetary value ? price reduction

Discount rate = price reduction ? list monetary value

Gross saless revenue enhancement = monetary value of point ? revenue enhancement rate

Interest = chief ? rate of involvement ? clip

Tips = cost of repasts ? tip rate

Commission = cost of service ? committee rate

Geometry expressions:

Margin:

Margin of a square: s + s + s + s

s: length of one side

Margin of a rectangle: cubic decimeter + tungsten + cubic decimeter + tungsten

cubic decimeter: length

tungsten: breadth

Margin of a trigon: a + B + degree Celsius

a. b. and degree Celsius: lengths of the 3 sides

Area:

Area of a square: s ? s

s: length of one side

Area of a rectangle: cubic decimeter ? tungsten

cubic decimeter: length

tungsten: breadth

Area of a trigon: ( b ? H ) /2

B: length of base

H: length of tallness

Area of a trapezoid: ( b1 + b2 ) ? h/2

b1 and b2: parallel sides or the bases

H: length of tallness

volume:

Volume of a regular hexahedron: s ? s ? s

s: length of one side

Volume of a box: cubic decimeter ? tungsten ? H

cubic decimeter: length

tungsten: breadth

H: tallness

Volume of a domain: ( 4/3 ) ? pi ? r3

pi: 3. 14

R: radius of domain

Volume of a triangular prism: country of trigon ? Height = ( 1/2 base ? tallness ) ? Height base: length of the base of the trigon

tallness: tallness of the trigon

Height: tallness of the triangular prism

Volume of a cylinder: pi ? r2 ? Height

pi: 3. 14

R: radius of the circle of the base

Height: tallness of the cylinder