Wow, you are really getting the hang of this, could you help us with this next challenge? It’s about time we had an expert on the team.

These sequences involve both letters and numbers! The letters and numbers are joined together in a special order.

Here is the alphabet for you to use as a reference:

**A B C D E F G H I J K L M N O P Q R S T U V W X Y Z**

Look at the following letter and number pair sequence:

**F45 is to G43 as J37 is to ______?**

First, we need to work out how the first letter becomes the second letter.

The letters are moving one place to the right in the alphabet.

Now we need to work out how the first number becomes the second number. This happens by **subtracting two** each time.

So we need to add one letter to **J **and **subtract two** numbers from **37 **to get **K35**.

So the answer is:

**F45 is to G43 as J37 is to K35.**

Let’s try another:

**Z14 is to S11 as K9 is to ______?**

First, we need to work out how the first letter becomes the second letter.

The letters are moving seven places to the left in the alphabet.

Now we need to work out how the first number becomes the second number. This happens by **subtracting three** each time.

So we need to see which letter is seven before **K.**

and **subtract three **numbers from **9** to get **D6**.

So the answer is:

**Z14 is to S11 as K9 is to D6.**

In this activity, you will need to be a sequence superstar to complete the number and letter pairs.

Pssstt!! Here’s a handy hint to help you reach superstar status:

Remember to use the alphabet line to help you work out the code.