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## FORMULAE

Building a formulaeAverage formula:Let a

_{1},a_{2},a_{3},……,a_{n}be a set of numbers, average = (a_{1}+ a_{2}+ a_{3},+……+ a_{n})/nFractions formulas:Converting an improper fraction to a mixed number:

Formula for a proportion:A VIDEO ABOUT FORMALAE INVOLVING FRACTIONSIn 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 + ss:length of one side

Perimeter of a rectangle: l + w + l + wl: length

w: width

Perimeter of a triangle: a + b + ca, b, and c: lengths of the 3 sides

Area:Area of a square: s × ss: length of one side

Area of a rectangle: l × wl: length

w: width

Area of a triangle: (b × h)/2b: length of base

h: length of height

Area of a trapezoid: (b_{1}+ b_{2}) × h/2b

_{1}and b_{2}: parallel sides or the basesh: length of height

volume:Volume of a cube: s × s × ss: length of one side

Volume of a box: l × w × hl: 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) × Heightbase: 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}× Heightpi: 3.14

r: radius of the circle of the base

Height: height of the cylinder

A VIDEO ABOUT FORMULAE

SUBSTITUTIONA VIDEO ABOUT FORMULAE AND SUBSTITUTION

## Attachments29

## ASSIGNMENT : FORMULAE ASSIGNMENT

MARKS : 10 DURATION : 30 minutes