# Solve Alphabet and Number Sequences Using Addition and Subtraction

In this worksheet students will solve sequences involving combined letter and number pairs, using addition and subtraction, in both a forward and reverse motion. 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

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.

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.

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.

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

Y289 is to B84 as T299 is to __?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

F234 is to O163 as U311 is to __?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

X118 is to R264 as P247 is to __ ?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

E471 is to V375 as V398 is to __ ?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

L122 is to Z463 as H98 is to __ ?

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

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

P29 is to K473 as J51 is to __ ?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

C494 is to N272 as U395 is to __ ?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

K319 is to F431 as S323 is to __?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

I331 is to R450 as H175 is to __ ?

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

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

V127 is to O230 as Y189  is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
• Question 1

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

Y289 is to B84 as T299 is to __?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
G94
EDDIE SAYS
Greetings, Detective. There are two sequences here. The letters follow a mirror image sequence. The number sequence is to subtract 205.
• Question 2

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

F234 is to O163 as U311 is to __?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
D260
EDDIE SAYS
The letter sequence is to make nine jumps forwards in the alphabet. The number sequence is to subtract 71. Excellent!
• Question 3

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

X118 is to R264 as P247 is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
J493
EDDIE SAYS
Super effort! There are two sequences here. The letter sequence is to move six steps back in the alphabet. The number sequence is to add 246.
• Question 4

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

E471 is to V375 as V398 is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
E302
EDDIE SAYS
Whoosh, your whizzing through this activity! The letters follow the mirror image sequence. The number sequence is to subtract 96.
• Question 5

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

L122 is to Z463 as H98 is to __ ?

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

V439
EDDIE SAYS
The letters sequence is to take fourteen jumps forwards. The number sequence is to add 341. Fantastic, five questions complete, five more to go!
• Question 6

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

P29 is to K473 as J51 is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
Q495
EDDIE SAYS
Did you find the sequence this time? The letters follow the mirror image sequence. Meanwhile, the number sequence is to add 444.
• Question 7

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

C494 is to N272 as U395 is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
F173
EDDIE SAYS
Did you work this one out? The letter sequence is to make eleven jumps forwards in the alphabet. The number sequence is to subtract 222.
• Question 8

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

K319 is to F431 as S323 is to __?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
N435
EDDIE SAYS
The letter sequence is to take five steps back. The number sequence is to add 112. Excellent!
• Question 9

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

I331 is to R450 as H175 is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
S294.
EDDIE SAYS
The letters follow the mirror image sequence. The number sequence here is to add 119. What is the last question, let's have a look and see!
• Question 10

Here are two groups of letter and number sequences. Each group follows the same special sequence, but with different letters and numbers.

V127 is to O230 as Y189  is to __ ?

 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 Z Y X W V U T S R Q P O N M L K J I H G F E D C B A
R492
EDDIE SAYS
The letter sequence is to take seven steps backwards in the alphabet. The number sequence is to add 303. We have reached the end of this mission, but we will need your expert help again soon!
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