Flashcards in Year 9 Yearlyz Deck (53)

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1

## How do you factorise an algebraic expression

###
*Find the HCF of the terms and write it outside the brackets

*divide each term by the HCF and write the answers inside the brackets

* To check that it's correct expand it.

2

## How to expand the difference of 2 squares

###
The rule is =

(a+b)(a-b) = a2 - b2

The answer is always a minus

3

## What is commission

### Commission is earned by sales people. It is calculated as a percentage of the value of items sold or income made.

4

## How do you find the unknown angle

### Shift tan 35 ab/c =

5

## How to Find the surface area of a closed cylinder

### 2 x Pie x radius2 + 2 x pie x radius x height

6

## How do we find the exterior angle of a triangle

###
It is equal to the sum of the two interior opposite angles

Triangle interior angle + triangle interior angle = triangle exterior angle

7

##
How do you find the net pay

### Net pay= gross pay - tax - other deductions

8

## How to expand a perfect square

###
(A + b)2 = a2 + 2ab + b2

E.g (m + 9)2

= m2 + 81m + 92

The 2 at the end are meant to be squared 2

9

## What is continuous data

### This can be any time of data such as 42.36263 degrees celcius

10

## What is the sin

### Opposite/hypotenuse

11

## Look at the fat index laws in your photos

### Ye

12

## What is the median

### The middle score

13

## How to find the percentage profit

### Profit/Cost Price X 100%

14

## What is discrete data

### Legit just whole numbers

15

## Look at chapter 4 and learn

### Yet

16

## What is numerical data

### Data that can be counted

17

## Study CHAPTER 7

### Do it

18

##
How to add or subtract algebraic fractions

### To add or subtract factions, convert them (if needed) so that they have the same denominator, then simply add or subtract the numerators.

19

## How to test for a Pythagorean triad

###
* square all numbers

* plus the first 2 numbers

* if it equals the third one it is a Pythagoras triad

20

## What is categorical data

### These can be put into categories such as someone's hair colour

21

##
What is the units of =

Kgs to grams

Hours to seconds

Kilometres to metres

Hours to minutes

Days to hours

Litres to mL

###
1kg = 1000 g

1h = 3600 s

1km = 1000m

1hr = 60 min

1d = 24 hrs

1L = 1000mL

22

## How many minutes is 1 degree

###
1 degree = 60'

23

## How to find the surface area

###
Find the area of each face and add the areas together

Make sure to square the answer at the end

24

## How to factorise a quadratic trinomial E.g x2 + 6x + 8

###
E.g x2 + 6x + 8

=(x+__)(x+__)

=(x+2)(x+4)

This is because 2 + 4 is 6 and 2 x 4 is 8

You can find this by dividing 8 by 2,3,4 and then plusing the 2 to whatever you got or 3 to whatever you got.

25

## How to find the area of a trapezium

### Area= 1/2 x (side+side) x height

26

## What is the mode

### It is the score that occurs most

27

## Power of a power? How to do

### When raising a power to another power, multiply the powers together

28

## Negative indices? How to do

### A number raised to a negative power gives a fraction with a numerator of 1 then remove the - on the power

29

## How do you multiply algebraic fractions

###
To multiply fractions, cancel any common fractions and then multiply the numerator and denominator separately e.g

=4/k x 3k/16

=3/4

This is because 4 16 4 times and k goes into k once

30