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**Exercise Set A**

## Question 1

**(a)** Write down any two even natural numbers.

**(b)** Is the sum of these two numbers odd or even?

**(c)** Repeat (a) and (b) four more times with four different pairs of even numbers.

**(d)** Based on part (c), complete the following sentence:

*“The sum of two even natural numbers is always…”*

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## Question 2

**(a)** Write down any two odd natural numbers.

**(b)** Is the sum of these two numbers odd or even?

**(c)** Repeat (a) and (b) four more times with four different pairs of odd numbers.

**(d)** Based on part (c), complete the following sentence:

*“The sum of two odd natural numbers is always…”*

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## Question 3

Write a list of \(10\) consecutive natural numbers.

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## Question 4

**(a)** Write a list of \(10\) natural numbers in a random order.**Bonus:** None of the numbers should be consecutive.

**(b)** Put those \(10\) numbers in ascending order.

**(c)** Put those \(10\) numbers in descending order.

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## Question 5

Using each of the digits \(1\), \(2\), \(3\) and \(4\) exactly once, many different four digit numbers can be created, e.g. \(2431\).

**(a)** State the largest of these four digit numbers.

**(b)** State the smallest of these four digit numbers.

**(c)** Write any *five* of these four digit numbers in ascending order.**Bonus:** Try not to use either of the four digit numbers used in parts (a) or (b).

**(d)** Write any *five* of these four digit numbers in *descending* order.**Bonus:** Try not to use any of the four digit numbers used in parts (a), (b) or (c).