# Maths Revision Notes Unit 2

Some Unit 2 Maths revision notes, hope they help!

- Created by: Katie Vicks
- Created on: 06-11-12 09:29

## Slides in this set

### Slide 1

Maths Unit 2 Edexcel Modular

By Lisa Lee…read more

### Slide 2

Types of Numbers

Square Numbers any number times by itself.

Examples: 4 (2x2),9 (3x3),16 (4x4),etc

Cube Numbers any numbers times by itself 3 times!

(Like volume of a cube!)

Examples: 8 (2x2x2), 27 (3x3x3), 64 (4x4x4),etc

Powers how many times a number multiplies itself by.

Example: powers of 2:

2² = 2x2 = 4

2³ = 2x2x2= 8

2 = 2x2x2x2= 16

Prime Numbers they only divide by themselves and

one.

If the number ends in 1,3,7 or 9, it means that there is a

chance of it being a prime number but it doesn't mean

it is definitely a prime number! (e.g. 21,27 are NOT prime These are quite

numbers though they end in 1/7 as they both divide by basic you NEED

3!)

to know them!

why…read more

### Slide 3

Multiples, Factors and Prime Factors

Multiple = multiply = just keep multiplying!

Multiples the times table of that particular

number. E.g. the multiples of 3 = 3,6,9,12,15,18

........ So hard to explain =`=

....Please read it over

if you don't

understand~~

Factors of a number are pairs of numbers that

you multiply to get another number.

e.g. factors of 24 = 1x24,2x12,3x8,4x6 (multiply

any of those pairs and you'll get 24!) just start

with 1 and keep going!

But- STOP when any numbers are repeated!

why…read more

### Slide 4

Examples

1x64 Factor of 64

2x32 1,64,2,32,4,16,8

3x

4x16

5x 3,5,6,7 can't be divided into 64.

6x So leave it!

7x

8x 8 Repeated

numbers so

STOP!

1x24

Don't write a number twice!

2x12 Factors of 24

3x8

1,24,2,12,3,8,4,6

4x6 Always start with `1' times the

Repeated numbers number!

5x

so STOP!

6x4

why…read more

### Slide 5

Factor Tree

`Factor trees' are used to find prime factors (prime

factors: a number broken down into a string of prime

numbers all multiplied together) Factor tree of 420 it

A factor tree looks like this: will show you the

prime factors of 420!

Each `level' of

`Level' 1 420 numbers multiplies to

get the number above

that level The numbers at the end

`Level' 2 42 42x10=420 10 (the ones in circles) are the

prime factors!

`Level' 3 6 5

6x7=42

7 2

2x5=10

2 3

2x3=6

Finally! The prime factors of 420 =2,3,7,2 and 5. You would get 420 by multiplying those

numbers.

So it's usually written with times signs = 2x3x7x2x5

However examiners like to see numbers in the simplest form,

so we should write it like = 2²x3x7x5 (2²= 2x2)

why…read more

### Slide 6

LCM

LCM- Lowest Common Multiple The smallest number that

will divide by all of the numbers in the question.

Once you know how to do the prime factors LCM and HCF

are fiddlesticks!

LCM Example: Find the LCM of 42 and 36.

1) Find the prime factors of 42 and 36

2) 42=7x2x3 36=2x2x3x3

3) Circle the common prime factors

4) 42=7x2x3 36=2x2x3x3

5) Write down the ones you have circles ONCE =2x3

6) Then put the ones you haven't circled in the list=

2x3x2x3x7=252

This means if you wrote out all of the multiples

in both numbers, 252 will be the first number

that is common to both numbers. why…read more

### Slide 7

### Slide 8

### Slide 9

### Slide 10

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## Similar Mathematics resources:

# Maths Revision Notes Unit 2

Some Unit 2 Maths revision notes, hope they help!

- Created by: Katie Vicks
- Created on: 06-11-12 09:29

## Slides in this set

### Slide 1

Maths Unit 2 Edexcel Modular

By Lisa Lee…read more

### Slide 2

Types of Numbers

Square Numbers any number times by itself.

Examples: 4 (2x2),9 (3x3),16 (4x4),etc

Cube Numbers any numbers times by itself 3 times!

(Like volume of a cube!)

Examples: 8 (2x2x2), 27 (3x3x3), 64 (4x4x4),etc

Powers how many times a number multiplies itself by.

Example: powers of 2:

2² = 2x2 = 4

2³ = 2x2x2= 8

2 = 2x2x2x2= 16

Prime Numbers they only divide by themselves and

one.

If the number ends in 1,3,7 or 9, it means that there is a

chance of it being a prime number but it doesn't mean

it is definitely a prime number! (e.g. 21,27 are NOT prime These are quite

numbers though they end in 1/7 as they both divide by basic you NEED

3!)

to know them!

why…read more

### Slide 3

Multiples, Factors and Prime Factors

Multiple = multiply = just keep multiplying!

Multiples the times table of that particular

number. E.g. the multiples of 3 = 3,6,9,12,15,18

........ So hard to explain =`=

....Please read it over

if you don't

understand~~

Factors of a number are pairs of numbers that

you multiply to get another number.

e.g. factors of 24 = 1x24,2x12,3x8,4x6 (multiply

any of those pairs and you'll get 24!) just start

with 1 and keep going!

But- STOP when any numbers are repeated!

why…read more

### Slide 4

Examples

1x64 Factor of 64

2x32 1,64,2,32,4,16,8

3x

4x16

5x 3,5,6,7 can't be divided into 64.

6x So leave it!

7x

8x 8 Repeated

numbers so

STOP!

1x24

Don't write a number twice!

2x12 Factors of 24

3x8

1,24,2,12,3,8,4,6

4x6 Always start with `1' times the

Repeated numbers number!

5x

so STOP!

6x4

why…read more

### Slide 5

Factor Tree

`Factor trees' are used to find prime factors (prime

factors: a number broken down into a string of prime

numbers all multiplied together) Factor tree of 420 it

A factor tree looks like this: will show you the

prime factors of 420!

Each `level' of

`Level' 1 420 numbers multiplies to

get the number above

that level The numbers at the end

`Level' 2 42 42x10=420 10 (the ones in circles) are the

prime factors!

`Level' 3 6 5

6x7=42

7 2

2x5=10

2 3

2x3=6

Finally! The prime factors of 420 =2,3,7,2 and 5. You would get 420 by multiplying those

numbers.

So it's usually written with times signs = 2x3x7x2x5

However examiners like to see numbers in the simplest form,

so we should write it like = 2²x3x7x5 (2²= 2x2)

why…read more

### Slide 6

LCM

LCM- Lowest Common Multiple The smallest number that

will divide by all of the numbers in the question.

Once you know how to do the prime factors LCM and HCF

are fiddlesticks!

LCM Example: Find the LCM of 42 and 36.

1) Find the prime factors of 42 and 36

2) 42=7x2x3 36=2x2x3x3

3) Circle the common prime factors

4) 42=7x2x3 36=2x2x3x3

5) Write down the ones you have circles ONCE =2x3

6) Then put the ones you haven't circled in the list=

2x3x2x3x7=252

This means if you wrote out all of the multiples

in both numbers, 252 will be the first number

that is common to both numbers. why…read more

### Slide 7

### Slide 8

### Slide 9

### Slide 10

## Comments

Lisa or Katie or both, you are amazing, thanks for the amazingly brilliant, extremely helpful and imaginatively portrayed notes

## Similar Mathematics resources:

## Related discussions on The Student Room

- AQA Business Unit 2 - Revision notes »
- Protostar's journey to amazing grades! (GCSE) »
- What did you get in your gcse's »
- no real roots gets some real GCSEs :D »
- Struggling to Revise? The 2017 TSR All Day Revision Thread »
- Revision struggles? Join the 2018 TSR All Day Revision ... »
- The Revision Thread »
- The Revision Thread Mk. II »
- MYGCSESCIENCE vs CGP revision guides »
- CoffeeGeek's Road to GCSE Success... This is it! (2017) »

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