Year 9 Mathematics Exam Revision

Percent divided by 100

% to Decimals

= 4b

2a + 2b

Unlike so = 2a + 2b

2a + 2b

= 18p3

6 x p x p x 3p

0 - 90 Degrees

Acute

2dp

Always round to..... in percentages/decimals

2dp

Always round to.....when problem is about money

6.479 - 6.5 (1dp)

Always write write what you're rounding

Brackets, Exponents, Division, Multiplication, Addition, Subtraction

B.E.D.M.A.S

North

Bearing are from the...

Written with three digits

Bearings are always..

Measured in a clockwise direction

Bearings are...

x 1000 x 1000 KL L ML divide 1000 divide 1000

Capacity Unity Conversions

Data that can be PUT INTO GROUPS

Categorical Data

I wonder what is the most COMMON

Categorical Data

A number that is not a prime number (More than 2 factors)

Composite

Data that is MEASURED

Continuous Data

1. Times denominator with whole number 2. Product of that divide by numerator

Converting a mixed number to an improper fraction

1. Divide numerator by denominator 2. Convert remainder to fraction (is the numerator) 3. The denominator is original denominator from improper fraction

Converting an improper fraction to a mixed fraction

Always (x,y)

Coordination

100c to $1 100c to $1.00 (2dp)

Decimals and Money

Decimal x 100

Decimals to %

Date that is COUNTED

Discrete Data

The steeper the gradient the faster it is

Distance/Time Relationships

All the same

Equilateral's sides are..

Price which does not have GST added to it

Exclusive

5(2 + 3) = 5 x 2 + 5 x 3 = 10 + 15 = 25

Expanding Algebra

3(x + 2) + 4(x - 3) = 3x + 6 + 4x - 12 = 7x - 6

Expanding and Simplifying

How many repeats

Exponents show...

4x - 4 = 4(x - 1)

Factorising

few

Factors are...

Multiplying fractions, No big problem Top times top and bottom times bottom Dividing fractions Easy as pie Flip the second and multiply Adding and Subtracting Fractions that you see Match the bottoms perfectly

Fraction Poem

Fraction x 100

Fractions to %

1. Divide numerator with denominator 2. Include remainders (but turn into fraction)

How to turn improper fraction to a whole number

1. Centre - Median 2. Spread - IQR 3. Unusual Value 4. Shape

I Notice Sentence Order

Alphabetical Order

In Algebra, letters are always in...

First

In Algebra, numbers are always..

The price when GST is added

Inclusive

2 Sides the same length

Isosceles' sides have....

Least Common Multiple

LCM

= x5

Law 1 ~ x2 . x3

= a4

Law 2 ~ a6/a2

x 1000 x 100 x10 KM M CM MM divide 1000 divide 100 divide 10

Length Unit Conversions

x 1000 x 1000 x1000 T KG G MG divide 1000 divide 1000 divide 1000

Mass Unit Conversions

Sum of all/number of values (Don't round to whole number!)

Mean

The middle number when the data is ordered

Median

The value occurring most frequently

Mode

= Positive

Negative X Negative

= Negative

Negative X Positive

Coefficient

Number in front of variable is called...

I wonder what the TYPICAL

Numerical Data

90 - 180 Degrees

Obtuse

Added/Subtracted

Only like terms can be...

flour:butter = 1:2

Order is important

change/original x 100

Percentage Change

= Positive

Positive X Positive

Has 2 Factors = One and itself

Prime Numbers

e.g 12:18 = 2:3

Ratios can be simplified

2 Numbers

Ratios must always have...

Angle's on a straight line

Reasoning for straight line

Vertically opposite angles are equal

Reasoning for vertically opposite

Angle's sum of Triangle Base angle's isosceles are equal Angle of equilateral Vertically opposite angles Angle's at a point Angle's on a straight line

Reasons:

180 - 360 Degrees

Reflex Angle

Measure acute angle and subtract by 360 Degrees

Reflex Angles

360 Degrees

Revolution

90 Degrees

Right Angle

3dp

Round to at least...... When decimal is too long

Graph must be equal

Scale = Uniform

All different

Scalene's sides are...

Simplest form

Simplest formAlways let ratios in their....

180 Degrees

Straight Angle

Divide

To find exclusive you...

Multiply

To find inclusive you..

Length x Width

To find the area you have to...

Add all sides

To find the perimeter you have to...

5x = 2x + 24 5x - 2x = 24 3x/3 = 24/3 x = 8

Two Step Equations

Divide

When back is BUYING from you, you....

Multiply

When bank is selling to YOU, you....

Move decimal point forwards

When dividing decimals and there are zeros...

Subtract exponents

When main sign is division...

Add exponents

When main sign is multiplication...

Move decimal point backwards

When multiplying decimals and there are zeros...

10c

When paying cash round to nearest...

0

Whole numbers have...

= 2a

a + a

= 2p

p x 2