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Year 9 Maths Exam cheat sheet Cheat Sheet by

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Laws of indices and surds

Angles of elevation and depression

Probab­ility

Experi­mental probab­ility
= The frequency of the outcome / total number of trials
Relative frequancy
frequency of the outcome / total number of trials

Financial maths

Dividing annual salary
Weekly = 52 | Fortni­ghtly = 26 | Monthly = 12
Calcul­ating percentage of $
0.% * $ | EG. 12% of 150 = 0.12 X 150

Propor­tional and rates

Extra probablity

 

Algebra

Coeffi­cient
The number in front | 5y, y's coeffi­cient is 5
Terms
A term is separated by a + or - sign | 5x-3y+2 there are 3 terms there
Constant
Constant is the single number which doesn't have any letters behind it

Factor­ising

Linear and Non-linear graphs

Gradient
Gradient = M | M=Rise divided by run
Gradient through two points
M = y2 - y1 / x2 - x1
Gradient intercept method
Y=mx + c | Find gradient + x and y intercept
x and y intercept method
To solve X, Y = 0 | To solve Y, X = 0, Then plot the x and y intercepts
Intercepts
Y = C | X = A

Statistics

 

Measur­ement

TSA
Area of all sides added up
Volume
Area X Height
SA of cylinder
SA = 2πr² + 2πrh
SA of sphere and volume
A=4πr² | V=4/3πr³ (volume)
TSA of Cone
πrl+πr²

Capacity

Area

Volume

Length

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