Workbook Detail
Number Detective Hard — Set 3
Use the clues to find the mystery number.
Show answer
Answer: 78
- Clues
- My tens digit is 7.
- My ones digit is 8.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 68
- Clues
- If you double me, you get 136.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 89
- Clues
- If you double me, you get 178.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 45
- Clues
- My tens digit is 4.
- I am not a multiple of 2.
- I am a multiple of 3.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 43
- Clues
- My tens digit is 4.
- I am not a multiple of 5.
- My digits add up to 7.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 54
- Clues
- My ones digit is 4.
- If you double me, you get 108.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 74
- Clues
- I am less than 77.
- My tens digit is 7.
- I am not a multiple of 3.
- I am an even number.
- My ones digit is 4.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 29
- Clues
- My digits add up to 11.
- If you double me, you get 58.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 15
- Clues
- I am less than 18.
- I am not a multiple of 2.
- I am a multiple of 5.
- AnswerRange
- 10
- 99
- Visual
- Type: inline-svgSvg: <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 44 44" width="44" height="44"><g transform="translate(4,4) scale(1)"><path fill="#F4900C" d="M35 26c0 2.209-1.791 4-4 4H5c-2.209 0-4-1.791-4-4V6.313C1 4.104 6.791 0 9 0h20.625C32.719 0 35 2.312 35 5.375V26z"/><path fill="#CCD6DD" d="M33 30c0 2.209-1.791 4-4 4H7c-2.209 0-4-1.791-4-4V6c0-4.119-.021-4 5-4h21c2.209 0 4 1.791 4 4v24z"/><path fill="#E1E8ED" d="M31 31c0 1.657-1.343 3-3 3H4c-1.657 0-3-1.343-3-3V7c0-1.657 1.343-3 3-3h24c1.657 0 3 1.343 3 3v24z"/><path fill="#F4900C" d="M31 32c0 2.209-1.791 4-4 4H6c-2.209 0-4-1.791-4-4V10c0-2.209 1.791-4 4-4h21c2.209 0 4 1.791 4 4v22z"/><path fill="#FFAC33" d="M29 32c0 2.209-1.791 4-4 4H6c-2.209 0-4-1.791-4-4V12c0-2.209 1.791-4 4-4h19.335C27.544 8 29 9.456 29 11.665V32z"/><path fill="#F4900C" d="M6 6C4.312 6 4.269 4.078 5 3.25 5.832 2.309 7.125 2 9.438 2H11V0H8.281C4.312 0 1 2.5 1 5.375V32c0 2.209 1.791 4 4 4h2V6H6z"/></g></svg>AltText: book orangePlacement: before-question
- VisualToken
- Type: asset-refEffectiveProvider: twemojiRequestedProvider: twemojiIconSize: 36Layout: icon-badgePlacement: before-questionItems: [{"ref":"twemoji:1f4d9","name":"book-orange","count":1,"role":"badge"}]
Use the clues to find the mystery number.
Show answer
Answer: 65
- Clues
- I am not a multiple of 3.
- If you double me, you get 130.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 29
- Clues
- My tens digit is 2.
- I am greater than 20.
- I am an odd number.
- I am not a multiple of 3.
- My digits add up to 11.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 54
- Clues
- If you double me, you get 108.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 58
- Clues
- Half of me is 29.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 79
- Clues
- I am less than 90.
- I am an odd number.
- If you double me, you get 158.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 53
- Clues
- If you double me, you get 106.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 93
- Clues
- My tens digit is 9.
- If you double me, you get 186.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 40
- Clues
- I am greater than 36.
- My tens digit is 4.
- Half of me is 20.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 39
- Clues
- My digits add up to 12.
- My ones digit is 9.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 19
- Clues
- I am greater than 17.
- My digits add up to 10.
- My tens digit is 1.
- AnswerRange
- 10
- 99
- Visual
- Type: inline-svgSvg: <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 44 44" width="44" height="44"><g transform="translate(4,4) scale(1)"><path fill="#DD2E44" d="M35.702 7.477L28.522.298c-.396-.397-1.038-.397-1.436 0L3.395 23.989c-.397.397-.397 1.038 0 1.437.72.719-3.14 7.959-3.395 8.496L2.068 36c.536-.255 7.785-4.115 8.506-3.395.397.397 1.039.397 1.436 0L35.702 8.913c.397-.396.397-1.039 0-1.436z"/><path fill="#EA596E" d="M4.139 23.24L26.407.972l8.62 8.62L12.759 31.86z"/><path fill="#292F33" d="M23.534 3.846l1.437-1.436 8.62 8.62-1.437 1.436zM5.576 21.803l1.436-1.437 8.62 8.62-1.437 1.437z"/><path fill="#BE1931" d="M26.886 9.353c-1.521-1.521-5.982.476-9.967 4.459-3.983 3.984-5.979 8.446-4.459 9.967 1.52 1.521 5.983-.476 9.967-4.459 3.983-3.984 5.979-8.447 4.459-9.967z"/></g></svg>AltText: crayonPlacement: before-question
- VisualToken
- Type: asset-refEffectiveProvider: twemojiRequestedProvider: twemojiIconSize: 36Layout: icon-badgePlacement: before-questionItems: [{"ref":"twemoji:1f58d","name":"crayon","count":1,"role":"badge"}]
Use the clues to find the mystery number.
Show answer
Answer: 80
- Clues
- Half of me is 40.
- AnswerRange
- 10
- 99
Teaching Notes
Practice number detective with free printable worksheets. Uniquely generated — reinforce key math skills with every set.
Frequently Asked Questions
How do I use this Number Detective Hard Worksheets worksheet?
Print the worksheet and complete the problems. Each set number generates a unique arrangement. Use the same set number for all students in a class for consistent assessment.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen.