Coding and decoding

Letter, number and symbol codes.

General Test6 questions
Practise this topic

Types

  • Letter shift: each letter moves forward or backward by a fixed number.
  • Reverse: the word is written backwards.
  • Number coding: letters replaced by their positions or a rule.
  • Substitution: one word stands for another (“if sky is called water…”).

Practice questions

If CAT is written as DBU in a code, how is DOG written in the same code?Easy
If PEN is coded as QFO, how is INK coded?Easy
If CAT = 24 (C=3, A=1, T=20), what is DOG?Medium
If “sky” is called “water”, “water” is called “tree” and “tree” is called “road”, where do birds fly?Medium
If TABLE is written as ELBAT, how is CHAIR written?Easy

Practise all 6 questions as a set

Practice this topic