EQUATIONS Flashcards by Habibah Shan

Q

mean from a table

A

MidPoint * frequency

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Q

Mean

A

Total / number

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Q

Median

A

Middle number - IN ORDER

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Q

Mode / Modal

A

Most common

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Q

Range

A

Largest-smallest

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Q

Histograms - frequency densitey

A

Frequency density = freq / class width

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Q

Histogram - frequency

A

Freq = class width * freq density

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Q

Percentage to decimal

A

Divide by 100

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Q

Compound interest

A

Original * multiplerPower = no of years

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Q

Percentage profit/loss

A

Change /original * 100

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Q

Interior + exterior =

A

180

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Q

Sum of exterior angles of any polygon

A

360

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Q

Sin

A

Square root number of fingers below / 2

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Q

Cos

A

Square root of no of fingers above / 2

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Q

Tan

A

flip hand over = square root fingers above / square root fingers below

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Q

Geometric sequence

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A

a*b n-1
a= starting number
b=common ratio

Q

perimeter of a semi circle

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A

TT * diameter / 2

Q

Area of a semi circle

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A

TT * r2 / 2
[ if it’s a quarter divide by 4 ]

Q

Arc length

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A

Angle / 360 * TT * diameter

Q

Area of a sector

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A

Angle / 360 * TT * r2

Q

Volume of a cylinder

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A

TTr2 * height

Q

SA of a cylinder

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A

Q

Volume of a cone

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A

1/3 * TTr2 * height

Q

SA of a cone

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A

TTr2+TTrl

Volume of a pyramid

1/2*length*width*height

SA of a pyramid

Calculate area of triangle Multiply number of sides

Triangle

Base * height / 2

Parallelogram

Base * Height

Square / rectangle

Length * width

Direct proportion

y=kx

Inverse proportion

y=k/x

Calculating gradient from coordinates

Diff in y / diff in x

Calculating gradient from a graph

rise/run

Perpendicular graph

-1/m

Triangle for distance

D S*T

Triangle for Density

M D*V

Triangle for Force

F P*A