Workbook Detail
Number Detective Hard — Set 1
Use the clues to find the mystery number.
Show answer
Answer: 39
- Clues
- I am less than 48.
- My tens digit is 3.
- If you double me, you get 78.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 94
- Clues
- I am a multiple of 2.
- My tens digit is 9.
- Half of me is 47.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 52
- Clues
- If you double me, you get 104.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 47
- Clues
- If you double me, you get 94.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 54
- Clues
- I am not a multiple of 5.
- I am less than 67.
- If you double me, you get 108.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 28
- Clues
- I am not a multiple of 3.
- I am an even number.
- If you double me, you get 56.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 51
- Clues
- My ones digit is 1.
- My digits add up to 6.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 25
- Clues
- My digits add up to 7.
- I am a multiple of 5.
- I am less than 38.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 19
- Clues
- My ones digit is 9.
- I am less than 33.
- 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 d="M11.946 27C-1.036 7.876 7.524 2.752 9.114 2c.149-.07.242-.105.245-.107.418-.209.638-.675.529-1.125C9.779.318 9.372 0 8.903 0H4.847C1.054 0-4.282 11 5.859 28c.151.253 5.073 0 5.073 0 .559 0 1.324-.541 1.014-1zM31.229 0h-4c-.462 0-.863.318-.971.768-.107.45.109.916.521 1.125.004.002.095.037.242.107 1.568.752 10.01 5.876-2.792 25-.307.459.448 1 1 1 0 0 4.854.253 5.002 0 10-17 4.739-28 .998-28z" fill="#C1694F"/><path d="M6.889 28.836l.004.01c-.064-.293 5.363-1.387 5.053-1.846C-1.036 7.876 7.524 2.752 9.114 2H4.845C1.053 2-3.268 13 6.889 28.836zM31.231 2h-4.21c1.568.752 10.01 5.876-2.792 25-.307.459 4.984 1.839 4.986 1.836C39.231 13 34.971 2 31.231 2z" fill="#662113"/><path fill="#C1694F" d="M9.916 8c-.561 0-1.015-.448-1.015-1 0-3.316-2.028-5-4.056-5-.47 0-.08-.782.029-1.232.11-.45.516-.768.985-.768h5.071c3.791 0 4.938 6.136 5.057 6.835.049.29-.034.586-.226.811-.195.225-.478.354-.775.354h-5.07zm16.315 0c.553 0 1-.448 1-1 0-3.316 2-5 4-5 .463 0 .078-.782-.029-1.232-.107-.45-.508-.768-.971-.768h-5c-3.738 0-4.869 6.136-4.986 6.835-.049.29.033.586.223.811.191.225.47.354.763.354h5z"/><path fill="#BE1931" d="M6 32s0 4 4 4h16s4 0 4-4V10s0-4-4-4H10c-4 0-4 4-4 4v22z"/><path fill="#A0041E" d="M24 28H12c-2.201 0-3-1.794-3-3V11c0-.552.448-1 1-1s1 .448 1 1v14c.012.45.195 1 1 1h12c.45-.012 1-.194 1-1V11c0-.552.447-1 1-1s1 .448 1 1v14c0 2.201-1.794 3-3 3z"/><path fill="#FFF" d="M16 25s0-1 1-1h2s1 0 1 1v5s0 1-1 1h-2s-1 0-1-1v-5z"/></g></svg>AltText: backpackPlacement: before-question
- VisualToken
- Type: asset-refEffectiveProvider: twemojiRequestedProvider: twemojiIconSize: 36Layout: icon-badgePlacement: before-questionItems: [{"ref":"twemoji:1f392","name":"backpack","count":1,"role":"badge"}]
Use the clues to find the mystery number.
Show answer
Answer: 97
- Clues
- I am not a multiple of 3.
- I am greater than 86.
- I am an odd number.
- My digits add up to 16.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 43
- Clues
- I am less than 46.
- If you double me, you get 86.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 11
- Clues
- My digits add up to 2.
- I am an odd number.
- 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: 53
- Clues
- If you double me, you get 106.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 80
- Clues
- I am not a multiple of 3.
- I am greater than 68.
- I am a multiple of 4.
- If you double me, you get 160.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 35
- Clues
- I am a multiple of 5.
- I am an odd number.
- My digits add up to 8.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 90
- Clues
- I am an even number.
- If you double me, you get 180.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 99
- Clues
- My ones digit is 9.
- I am a multiple of 3.
- My digits add up to 18.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 49
- Clues
- My digits add up to 13.
- I am less than 61.
- If you double me, you get 98.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 63
- Clues
- I am not a multiple of 5.
- My digits add up to 9.
- I am an odd number.
- If you double me, you get 126.
- AnswerRange
- 10
- 99
Use the clues to find the mystery number.
Show answer
Answer: 45
- Clues
- I am greater than 32.
- My digits add up to 9.
- My ones digit is 5.
- 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.