# Solve Alphabet and Number Sequencing Problems

In this worksheet, students will solve simple sequences involving combined letter and number pairs. It will develop students’ problem solving and sequencing skills.

Key stage:  KS 2

Curriculum topic:   Verbal Reasoning

Curriculum subtopic:   Letter Connections

Difficulty level:

### QUESTION 1 of 10

Hi code detective, the puzzles are coming in thick and fast!  Are you ready to try something new? 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:

A1 is to B2 as C3 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 adding one each time.

So we need to add one letter to C and one number to 3 to get the missing pair of D4.

A1 is to B2 as C3 is to D4.

Let’s try another:

C4 is to E5 as F7 is to ______?

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

The letters are moving two places to the right in the alphabet.

Now we need to work out how the first number becomes the second number. This happens by adding one each time.

So we need to add two letters to F and one number to 7 to get the missing pair of H8.

C4 is to E5 as F7 is to H8.

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

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

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

3 is to 4 as 5 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

5 is to 7 as 9 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

12 is to 14 as 20 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

23 is to 26 as 14 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

10 is to 8 as 12 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

5 is to 10 as 15 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

45 is to 46 as 38 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

19 is to 16 as 34 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

51 is to 49 as 19 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

88 is to 91 as 45 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

• Question 1

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

3 is to 4 as 5 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

6
EDDIE SAYS
Hi there, detective! The sequence here is add one. So 5 + 1 = 6.
Top tip: Work out the sequence in the first group. Then follow this same pattern to find the missing number in the second group.
• Question 2

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

5 is to 7 as 9 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

11
EDDIE SAYS
How did you get on? The sequence is to add two. So 9 + 2 = 11.
• Question 3

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

12 is to 14 as 20 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

22
EDDIE SAYS
Getting the hang of it? The sequence here is to add two. So 20 + 2 = 22. Great!
• Question 4

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

23 is to 26 as 14 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

17
EDDIE SAYS
Brilliant effort! The sequence here is to add three. So 14 + 3 = 17.
• Question 5

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

10 is to 8 as 12 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

10
EDDIE SAYS
We are moving backwards this time! The sequence is to subtract two. So 12 - 2 = 10.
• Question 6

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

5 is to 10 as 15 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

20
EDDIE SAYS
Did you find the missing number? The sequence this time is to add five. So 15 + 5 = 20.
• Question 7

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

45 is to 46 as 38 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

39
EDDIE SAYS
Did you work it out and locate the numbers? The sequence is to add one. So 38 + 1 = 39.
• Question 8

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

19 is to 16 as 34 is to ______ ?

Use your detective skills to work out the special sequence and find the missing number.

31
EDDIE SAYS
This one is a bit more tricky! The sequence here is to take away three. So 34 - 3 = 31.
• Question 9

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

51 is to 49 as 19 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

17
EDDIE SAYS
The sequence is to subtract two. So 19 - 2 = 17.
Let's take a look at the last question in this activity!
• Question 10

Here are two groups of numbers. Each group follows the same special sequence, but with different numbers.

88 is to 91 as 45 is to ______?

Use your detective skills to work out the special sequence and find the missing number.

48
EDDIE SAYS
The sequence this time is to add three. So 45 + 3 = 48.
Fantastic sequencing work. All the missing numbers have been found. Hope to see you again soon for another fun activity!
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