# A Million

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```							          A Million

How many thousands is a million?
 A thousand thousands is a million

 1000 X 1000 = 1 000 000
A trillion
 How many million make a trillion
 A thousand millions make a trillion

 1 000 x 1000 000 = 1000 000 000
 How many tens is a million?
 100 000 tens is a million

 10 X 100 000 = 1 000 000
A million
 How many hundreds make a million
A Million
 10 000 hundreds make a million

 10 000 x 100 = 1000 000

 (you can count the zeros )

 4 zeros x 2 zeros = 6 zeros with a one in
front
 Write the value of each underlined number

 54 178 473 =
 41 962 349 =
 54 178 473 = 4 000 000
 41 962 349 = 900 000
Multiples
 What is a multiple?
 A multiple is a number you get when you
multiply a certain number

 For example the multiples of 5 are
 5, 10, 15 20, 25, 30
 The multiples of 3 are 3,6, 9, 12, 15, 18
 What are the first four multiples of 8?
 The first four multiples of 8

 8, 16, 24, 32
 Common Multiples are the multiples that two
numbers have in common
 Multiples of 4 :4, 8, 12, 16, 20 , 24
 Multiples of 6: 6, 12, 18 , 24, 30

 12 and 24 are the first 2 common multiples of 4
and 6
 Once you get the first common multiple,keep
adding that amount, 12 (+12) 24 (+12) 36
 What are the first 4 common multiples of 5
and 4?
 4 – 4, 8, 12, 16, 20, 24, 28, 32,36, 40

 5 – 5, 10, 15, 20, 25, 30, 35, 40

 The first common multiple – or lowest common
multiple is 20

 After that just keep adding 20 to get the others
 20, 40, 60, 80
Prime Numbers

 What is a prime number?
 A prime number is a number that can only
be divided by itself and 1

 Examples: 1, 2, 3, 5, 7,
Composite Numbers
 What is a composite number?
 A composite number is a number that can
be divided by 3 or more whole numbers

 Example

 6 is a composite number: it can be divided
by 1, 2, 3, 6
 Which of the numbers below is a prime
number, which is a composite number

 Hint: All even numbers above 2 are
composite, why?

 3, 7, 8, 9, 11, 13, 15, 16, 21, 22, 23
 Even numbers greater than 2 are all
composite because they can be divided by 2
as well as themselves and 1. (4, 6, 8, 10,
12, 14,,16, 18 are all composite numbers)

 p= prime c= composite

 3, 7, 8, 9, 11, 13, 15, 16, 21, 22, 23
p p c c p p c c c c p
Factors

 What is a factor?
Factors
 A factor is a number that is multiplied to get
a product. A product is the answer you get
when you multiply.

 Example: 3 and 4 are factors of 12
 3 X 4 = 12
 Name all the factors of 24
 Factors of 24 are

 1, 2, 3, 4, 6, 8, 12, 24
 Some numbers have an odd numbers of factors

   For example 4 :
   Factors: 1, 2, 4
   9: 1, 3, 9
   Why do these numbers have an odd numbers of
factors. What is special about these numbers
 These numbers are square numbers.
 Name some other square numbers.
Square Numbers

 16, 25, 36, 49, 64, 81
 Write a number as a product of prime
numbers

 15: 3 x 5

 16= 4 x 4 = 2 x 2 x 2 x 2
 Write 24 as a product of prime numbers
 24= 4 x 6
 =2x2x2x3
 What is the greatest common factors of 21
and 14?

 14: 1, 2, 7, 14
 21: 1, 2, 3, 7, 21

 The Greatest common Factor is 7
Order of Operations
 What are the order of operations?
 Order of Operations is the order in which
you are supposed to solve an equation

 Do the operations in brackets.
 Multiply and divide in order from let to right
 Then add and subtract in order from left to
right.
 Example:

 2+8x3
 = 2 + 24
 =26
 Solve the following:

 7 X (4 + 3) =

 5+4x5=

```
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