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25 cardsNAPLAN Year 9 Practice

NAPLAN Year 9 Key Rules

Maths formulas and grammar rules that come up in Year 9 literacy and numeracy practice.

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Area of a triangle

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Area of a triangle

Half of the base times the perpendicular height:

A = \frac{1}{2} bh

Area of a circle

A = π r^{2}

, where

r

is the radius.

Circumference of a circle

C = 2 π r

C = π d

Pythagoras' theorem

In a right-angled triangle,

a^{2} + b^{2} = c^{2}

, where

c

is the hypotenuse.

Volume of a rectangular prism

Length times width times height.

Litres and cubic centimetres

1 litre equals 1000 cm³.

Sum of interior angles of a polygon

(n - 2) \times 180

degrees, where

n

is the number of sides.

Gradient of a line

Rise divided by run, or

\frac{y _{2} - y _{1}}{x _{2} - x _{1}}

Equation of a line in gradient-intercept form

y = m x + c

, where

m

is the gradient and

c

is the y-intercept.

Average speed

Total distance divided by total time.

Percentage change

Change divided by the original amount, times 100.

Mean, median and mode

Mean is the sum divided by the count, median is the middle value of ordered data, mode is the most common value.

Probability of an event

Number of favourable outcomes divided by the total number of equally likely outcomes.

Multiplying powers with the same base

Add the indices:

a^{m} \times a^{n} = a^{m + n}

Dividing powers with the same base

Subtract the indices:

a^{m} \div a^{n} = a^{m - n}

Scientific notation

A number between 1 and 10 times a power of 10, such as

4.2 \times 1 0^{- 4}

Its versus it's

It's means 'it is' or 'it has'; its shows that something belongs to it.

Their, there and they're

Their shows ownership, there shows place, and they're means 'they are'.

Affect versus effect

Affect is usually a verb meaning to influence; effect is usually a noun meaning a result.

Fewer versus less

Use fewer with countable things and less with amounts that cannot be counted.

Semicolon

Joins two closely related complete sentences without a conjunction.

Colon

Follows a complete clause and introduces a list, an explanation or a quotation.

Apostrophe of possession

Add 's to a singular noun (the student's book) and only an apostrophe to a plural ending in s (the students' books).

Comma splice

Two complete sentences joined only by a comma; fix it with a full stop, a semicolon or a conjunction.

Dangling modifier

A descriptive phrase whose subject is missing or wrong, such as 'Walking to school, the rain began'. Name the walker.

NAPLAN Year 9 Practice in Australia

In Australia, NAPLAN Year 9 Practice is part of: School exams.

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