Workbook Detail
Number Detective Hard — Set 3
This page uses a content type that does not have a custom renderer yet. Raw structured data is shown below.
{
"_meta": {
"schemaVersion": "2.0.0",
"nodeId": "node-1-detective-hard",
"pageNumber": 3,
"generatedAt": "2026-03-01T01:51:51.717Z",
"generatorVersion": "v7.2.1-wp-g2",
"seed": "13295565443056736356",
"resolvedParams": {
"expectedPuzzleSize": null,
"expectedSize": null,
"expectedDifficulty": "hard",
"expectedVariant": null,
"displayDifficulty": "hard",
"theme": null,
"contentType": null,
"source": {
"puzzleSize": "config",
"size": "config",
"difficulty": "slug",
"variant": "config"
}
},
"contractVersion": "1.0",
"canonicalVersion": "2.0",
"archetype": "form-exercise",
"contentHash": "20ae418ec0d6f3eb973bb944cd598dfe934b0f293a1e082bc0408c598ddd4160",
"fallbackReason": null
},
"title": "form-exercise set 3",
"operation": "number-detective",
"subject": "arithmetic",
"difficulty": "hard",
"config": {
"difficulty": "hard",
"maxNumber": 10
},
"problems": [
{
"id": 1,
"type": "number-detective",
"clues": [
"My tens digit is 7.",
"My ones digit is 8."
],
"answer": 78,
"correctAnswer": "78",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 2,
"type": "number-detective",
"clues": [
"If you double me, you get 136."
],
"answer": 68,
"correctAnswer": "68",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 3,
"type": "number-detective",
"clues": [
"If you double me, you get 178."
],
"answer": 89,
"correctAnswer": "89",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 4,
"type": "number-detective",
"clues": [
"My tens digit is 4.",
"I am not a multiple of 2.",
"I am a multiple of 3."
],
"answer": 45,
"correctAnswer": "45",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 5,
"type": "number-detective",
"clues": [
"My tens digit is 4.",
"I am not a multiple of 5.",
"My digits add up to 7."
],
"answer": 43,
"correctAnswer": "43",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 6,
"type": "number-detective",
"clues": [
"My ones digit is 4.",
"If you double me, you get 108."
],
"answer": 54,
"correctAnswer": "54",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 7,
"type": "number-detective",
"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."
],
"answer": 74,
"correctAnswer": "74",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 8,
"type": "number-detective",
"clues": [
"My digits add up to 11.",
"If you double me, you get 58."
],
"answer": 29,
"correctAnswer": "29",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 9,
"type": "number-detective",
"clues": [
"I am less than 18.",
"I am not a multiple of 2.",
"I am a multiple of 5."
],
"answer": 15,
"correctAnswer": "15",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number.",
"visual": {
"type": "inline-svg",
"svg": "<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 orange",
"placement": "before-question"
},
"_visualToken": {
"type": "asset-ref",
"effectiveProvider": "twemoji",
"requestedProvider": "twemoji",
"iconSize": 36,
"layout": "icon-badge",
"placement": "before-question",
"items": [
{
"ref": "twemoji:1f4d9",
"name": "book-orange",
"count": 1,
"role": "badge"
}
]
}
},
{
"id": 10,
"type": "number-detective",
"clues": [
"I am not a multiple of 3.",
"If you double me, you get 130."
],
"answer": 65,
"correctAnswer": "65",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 11,
"type": "number-detective",
"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."
],
"answer": 29,
"correctAnswer": "29",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 12,
"type": "number-detective",
"clues": [
"If you double me, you get 108."
],
"answer": 54,
"correctAnswer": "54",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 13,
"type": "number-detective",
"clues": [
"Half of me is 29."
],
"answer": 58,
"correctAnswer": "58",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 14,
"type": "number-detective",
"clues": [
"I am less than 90.",
"I am an odd number.",
"If you double me, you get 158."
],
"answer": 79,
"correctAnswer": "79",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 15,
"type": "number-detective",
"clues": [
"If you double me, you get 106."
],
"answer": 53,
"correctAnswer": "53",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 16,
"type": "number-detective",
"clues": [
"My tens digit is 9.",
"If you double me, you get 186."
],
"answer": 93,
"correctAnswer": "93",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 17,
"type": "number-detective",
"clues": [
"I am greater than 36.",
"My tens digit is 4.",
"Half of me is 20."
],
"answer": 40,
"correctAnswer": "40",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 18,
"type": "number-detective",
"clues": [
"My digits add up to 12.",
"My ones digit is 9."
],
"answer": 39,
"correctAnswer": "39",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 19,
"type": "number-detective",
"clues": [
"I am greater than 17.",
"My digits add up to 10.",
"My tens digit is 1."
],
"answer": 19,
"correctAnswer": "19",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number.",
"visual": {
"type": "inline-svg",
"svg": "<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": "crayon",
"placement": "before-question"
},
"_visualToken": {
"type": "asset-ref",
"effectiveProvider": "twemoji",
"requestedProvider": "twemoji",
"iconSize": 36,
"layout": "icon-badge",
"placement": "before-question",
"items": [
{
"ref": "twemoji:1f58d",
"name": "crayon",
"count": 1,
"role": "badge"
}
]
}
},
{
"id": 20,
"type": "number-detective",
"clues": [
"Half of me is 40."
],
"answer": 80,
"correctAnswer": "80",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
}
],
"layout": {
"columns": 2,
"problemsPerPage": 20
},
"_archetype": null,
"_generatorId": null
}Teaching Notes
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
- Use the clues to find the mystery number.
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.