MAKE IT YOURS

A world for every learner

Choose a grade to discover its colours and creative world.

Grade 3 Challenge: Mystery Number Riddles Worksheet with Answers

Grade 3 (US) · Year 4 (UK) · Class 3 (India) · Math

Unit 6: Going FurtherChallenge PuzzlesChallenge

Reasoning backwards from clues to find a hidden number — great for building number sense. This free upper elementary worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

Save to PinterestJump to answer key
  • Answer keys checked by code
  • No ads, ever
  • No student accounts needed
  • Safety & privacy
Practice Sheetaethelsystems.com

Challenge: Mystery Number Riddles

Grade 3 · Math

Score___ / 12

Name

Class

Date

Learning goal: Challenge Puzzles

Directions: Solve each problem. Show your work, then write your answer in the box.

Example

I am thinking of a number. If I take away 6, I get 22. What is my number?

Answer: 28

  1. 1

    I am thinking of a number. If I add 3, I get 23. What is my number?

    Answer
  2. 2

    I am thinking of a number. If I add 4, I get 23. What is my number?

    Answer
  3. 3

    I am thinking of a number. If I add 8, I get 35. What is my number?

    Answer
  4. 4

    I am thinking of a number. If I take away 7, I get 3. What is my number?

    Show your work
    Answer
  5. 5

    I am thinking of a number. If I take away 2, I get 12. What is my number?

    Show your work
    Answer
  6. 6

    I am thinking of a number. If I add 7, I get 24. What is my number?

    Answer
  7. 7

    I am thinking of a number. If I add 5, I get 33. What is my number?

    Answer
  8. 8

    I am thinking of a number. If I double it and add 7, I get 65. What is my number?

    Show your work
    Answer
  9. 9

    I am thinking of a number. If I double it and add 9, I get 51. What is my number?

    Show your work
    Answer
  10. 10

    I am thinking of a number. If I add 5, I get 22. What is my number?

    Answer
  11. 11

    I am thinking of a number. If I add 9, I get 14. What is my number?

    Answer
  12. 12

    I am thinking of a number. If I add 6, I get 29. What is my number?

    Answer

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/3/challenge_mystery_number

Answer key (click to show)
  1. 1.20
  2. 2.19
  3. 3.27
  4. 4.10
  5. 5.14
  6. 6.17
  7. 7.28
  8. 8.29
  9. 9.21
  10. 10.17
  11. 11.5
  12. 12.23

Need another Challenge: Mystery Number Riddles worksheet?

Generate unlimited fresh versions at easy, medium or hard difficulty, each with its own answer key. Free during our launch — no card needed.

Create a free account

How to use this worksheet

  • Use it as a 10–15 minute warm-up or homework task rather than a long drill.
  • Ask students to show their working so you can see where a mistake started, not just that it happened.
  • Mark it with the answer key together, then print a fresh version of the same topic to practise the questions they missed.

Related worksheets

Challenge: Mystery Number Riddles at other grades

Grade 1Grade 2

More Grade 3 Math worksheets

Grade 3 Challenge: Missing Digit PuzzlesGrade 3 Challenge: Magic SquaresGrade 3 Multi-Digit MultiplicationGrade 3 Long Division with RemaindersGrade 3 Factors & MultiplesGrade 3 Find the MistakeGrade 3 Bar Model Word ProblemsGrade 3 Balance Scale Puzzles

Guides for teaching Challenge: Mystery Number Riddles

AI and Homework: A Parent's Guide to Helping Kids Learn (Not Cheat)How AI chatbots can help or harm learning, the signs homework was done by AI, simple house rules that work, and good ways for children to use AI to study.How to Teach Kids to Tell Time: A Step-by-Step PlanStart with the hour hand, then half hours, five minutes, single minutes and elapsed time — the order that makes analog clocks click, plus games and common mix-ups.Long Division Step by Step: An Easy Method (With Remainders)Divide, multiply, subtract, bring down — the four-step routine that makes long division manageable, with worked examples, remainders, zeros and two-digit divisors.

Can't find what you need? Tell us which worksheet to make next.

Frequently asked questions

Does this Grade 3 Challenge: Mystery Number Riddles worksheet come with answers?

Yes. The full answer key is on this page, and it prints on its own page after the questions. Every answer is calculated or checked by code rather than written by an AI model, so the key is always correct.

How do I print it or save it as a PDF?

Click "Download PDF" to save a ready-to-print PDF with the answer key on the last page, or click "Print" to send the worksheet and answer key straight to your printer.

Can I get a different Challenge: Mystery Number Riddles worksheet?

Yes. Create a free account to generate as many fresh Grade 3 Challenge: Mystery Number Riddles worksheets as you like, at easy, medium or hard difficulty, each with its own answer key.

Is this worksheet free?

Yes. This worksheet is free to print, and Practice Sheet is free to use during our launch with no card needed.