Workbook Detail
Number Detective Hard — Set 1
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": 1,
"generatedAt": "2026-03-01T01:51:51.716Z",
"generatorVersion": "v7.2.1-wp-g2",
"seed": "8530546190032344734",
"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": "e80ca4d6e67692fe64809c5c254d71893b52a6710444ee401e883ba9427869a9",
"fallbackReason": null
},
"title": "form-exercise set 1",
"operation": "number-detective",
"subject": "arithmetic",
"difficulty": "hard",
"config": {
"difficulty": "hard",
"maxNumber": 10
},
"problems": [
{
"id": 1,
"type": "number-detective",
"clues": [
"I am less than 48.",
"My tens digit is 3.",
"If you double me, you get 78."
],
"answer": 39,
"correctAnswer": "39",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 2,
"type": "number-detective",
"clues": [
"I am a multiple of 2.",
"My tens digit is 9.",
"Half of me is 47."
],
"answer": 94,
"correctAnswer": "94",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 3,
"type": "number-detective",
"clues": [
"If you double me, you get 104."
],
"answer": 52,
"correctAnswer": "52",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 4,
"type": "number-detective",
"clues": [
"If you double me, you get 94."
],
"answer": 47,
"correctAnswer": "47",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 5,
"type": "number-detective",
"clues": [
"I am not a multiple of 5.",
"I am less than 67.",
"If you double me, you get 108."
],
"answer": 54,
"correctAnswer": "54",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 6,
"type": "number-detective",
"clues": [
"I am not a multiple of 3.",
"I am an even number.",
"If you double me, you get 56."
],
"answer": 28,
"correctAnswer": "28",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 7,
"type": "number-detective",
"clues": [
"My ones digit is 1.",
"My digits add up to 6."
],
"answer": 51,
"correctAnswer": "51",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 8,
"type": "number-detective",
"clues": [
"My digits add up to 7.",
"I am a multiple of 5.",
"I am less than 38."
],
"answer": 25,
"correctAnswer": "25",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 9,
"type": "number-detective",
"clues": [
"My ones digit is 9.",
"I am less than 33.",
"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 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": "backpack",
"placement": "before-question"
},
"_visualToken": {
"type": "asset-ref",
"effectiveProvider": "twemoji",
"requestedProvider": "twemoji",
"iconSize": 36,
"layout": "icon-badge",
"placement": "before-question",
"items": [
{
"ref": "twemoji:1f392",
"name": "backpack",
"count": 1,
"role": "badge"
}
]
}
},
{
"id": 10,
"type": "number-detective",
"clues": [
"I am not a multiple of 3.",
"I am greater than 86.",
"I am an odd number.",
"My digits add up to 16."
],
"answer": 97,
"correctAnswer": "97",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 11,
"type": "number-detective",
"clues": [
"I am less than 46.",
"If you double me, you get 86."
],
"answer": 43,
"correctAnswer": "43",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 12,
"type": "number-detective",
"clues": [
"My digits add up to 2.",
"I am an odd number."
],
"answer": 11,
"correctAnswer": "11",
"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": 13,
"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": 14,
"type": "number-detective",
"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."
],
"answer": 80,
"correctAnswer": "80",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 15,
"type": "number-detective",
"clues": [
"I am a multiple of 5.",
"I am an odd number.",
"My digits add up to 8."
],
"answer": 35,
"correctAnswer": "35",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 16,
"type": "number-detective",
"clues": [
"I am an even number.",
"If you double me, you get 180."
],
"answer": 90,
"correctAnswer": "90",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 17,
"type": "number-detective",
"clues": [
"My ones digit is 9.",
"I am a multiple of 3.",
"My digits add up to 18."
],
"answer": 99,
"correctAnswer": "99",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 18,
"type": "number-detective",
"clues": [
"My digits add up to 13.",
"I am less than 61.",
"If you double me, you get 98."
],
"answer": 49,
"correctAnswer": "49",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 19,
"type": "number-detective",
"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."
],
"answer": 63,
"correctAnswer": "63",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
},
{
"id": 20,
"type": "number-detective",
"clues": [
"I am greater than 32.",
"My digits add up to 9.",
"My ones digit is 5."
],
"answer": 45,
"correctAnswer": "45",
"answerRange": [
10,
99
],
"question": "Use the clues to find the mystery number."
}
],
"layout": {
"columns": 2,
"problemsPerPage": 20
},
"semantics": {
"contentType": "form-exercise",
"difficulty": "medium"
},
"version": "2.0",
"_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.