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Olympiad (Class 4) Coding and decoding — practice questions

Explore 63 free Coding and decoding questions in Olympiad (Class 4) Reasoning. Open each question or exercise to read its content, reference answers and available explanation.

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Coding and decoding questions and exercises with answers

Showing questions 1–30 of 63.

Tara hides a message by writing the letter after each one. What does she write for CAT?Read the answer and worked solution →A spy moves every letter of DOG one step on in the alphabet. What does the spy get?Read the answer and worked solution →Hop each letter of SUN two steps ahead along the alphabet. Which word do you land on?Read the answer and worked solution →A secret club jumps three letters ahead, so A turns into D. What does BAT turn into?Read the answer and worked solution →Riya types MAP, but a faulty keyboard prints the neighbour after each letter. What appears?Read the answer and worked solution →A robot always prints the following alphabet letter. You ask for BOOK. What is printed?Read the answer and worked solution →A robot prints the following letter instead of the one you press. It printed IBQQZ. What did you press?Read the answer and worked solution →A slip reads FDW after a jump of three letters ahead. Walk back three letters to read it.Read the answer and worked solution →Ravi hides PEN by stepping each letter one place towards the start of the alphabet. What does he write?Read the answer and worked solution →Moving three steps on from X, Y and Z must loop back to the start. What does XYZ become?Read the answer and worked solution →Imagine a flipped alphabet where A swaps with Z and B with Y. What does CAT turn into?Read the answer and worked solution →With the flipped alphabet, where A and Z swap places, which word replaces DOG?Read the answer and worked solution →On a flipped alphabet, A pairs with Z and B with Y. Which letter pairs with M?Read the answer and worked solution →Add up the alphabet numbers (A is 1, B is 2 and so on) of C, A and T. What total do you get?Read the answer and worked solution →Give each letter its place number in the alphabet. What do D, O and G add up to?Read the answer and worked solution →B, A and G each have a place number in the alphabet. Find their total.Read the answer and worked solution →Rita counts the alphabet positions of H, E and N and adds them. What does she get?Read the answer and worked solution →What is the total of the alphabet positions of I, C and E?Read the answer and worked solution →Add the alphabet positions of T, E and N. Which total is right?Read the answer and worked solution →Z is the last letter of the alphabet. Add its position to those of two O letters. What is the total?Read the answer and worked solution →Counting from A as number 1, which letter is number 20?Read the answer and worked solution →The numbers 3, 1 and 14 are alphabet place numbers. Which word do they spell?Read the answer and worked solution →Spell the word hidden in 19, 21 and 14 using alphabet place numbers.Read the answer and worked solution →Alphabet place numbers 8, 5, 12 and 16 are on a card. What does the card ask for?Read the answer and worked solution →A clue reads 4, 1, 25 using alphabet places. Which word is it?Read the answer and worked solution →Which bird hides in the numbers 2, 9, 18 and 4 when turned into letters by place?Read the answer and worked solution →Turn 6, 9, 19 and 8 into letters by alphabet place. Which sea animal do you get?Read the answer and worked solution →Which big cat appears when 12, 9, 15 and 14 are changed into letters by place number?Read the answer and worked solution →Players swap names so red is called blue, blue is called green and green is called yellow. What do they call grass?Read the answer and worked solution →Names swap: book to pen, pen to bag, bag to box. Which new name belongs to the tool for writing?Read the answer and worked solution →

Worked practice questions

Tara hides a message by writing the letter after each one. What does she write for CAT?

  1. CBU
  2. DBU
  3. DBS
  4. EBU
Show answer and solution

Correct answer: B. DBU

C moves to D, A moves to B and T moves to U, so CAT becomes DBU.

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A spy moves every letter of DOG one step on in the alphabet. What does the spy get?

  1. EPG
  2. EPH
  3. FPH
  4. DPH
Show answer and solution

Correct answer: B. EPH

D goes to E, O goes to P and G goes to H, which gives EPH.

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Hop each letter of SUN two steps ahead along the alphabet. Which word do you land on?

  1. VXQ
  2. UVP
  3. TVO
  4. UWP
Show answer and solution

Correct answer: D. UWP

S plus 2 is U, U plus 2 is W and N plus 2 is P, so SUN becomes UWP.

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