🔎 BooksGrade 4Reading: grades 3-4Fractions of a numberRoundingAdditionSubtraction
The Case of the Missing Golden Bookmark
A sneaky villain snuck into the Whispering Willow Library and stole the sacred Golden Bookmark! Use your reading clues and math skills to solve the mystery before the story ends.
Suspects
Possible suspects
Cross off a row as each clue rules it out. On screen, tap a row.
21 of 21 still in play
| Name | Literary Spell | Bookmark Style | Reading Style | Ink Streak Color | Weakness |
|---|---|---|---|---|---|
| Reed Reader | Paper Folding | Pressed Flower | Reads With Spectacles | Gold Ink Streak | Bright Reading Lamps |
| Chloe Chapter | Shadow Pages | Ribbon Bookmark | Reads With Spectacles | Blue Ink Streak | Heavy Dust Dusters |
| Harper Binding | Book Teleporting | Leather Strap | Reads Without Spectacles | Gold Ink Streak | Bright Reading Lamps |
| Quill Quentin | Ink Blotting | Metal Clip | Reads Without Spectacles | Blue Ink Streak | Heavy Dust Dusters |
| Tome Tommy | Whispering Words | Pressed Flower | Reads Without Spectacles | Blue Ink Streak | Heavy Dust Dusters |
| Page Turner | Ink Blotting | Leather Strap | Reads Without Spectacles | Gold Ink Streak | Heavy Dust Dusters |
| Penny Paper | Ink Blotting | Golden Tassel | Reads Without Spectacles | Blue Ink Streak | Loud Paper Shredders |
| Percy Parchment | Whispering Words | Metal Clip | Reads With Spectacles | Silver Ink Streak | Loud Paper Shredders |
| Novel Norris | Shadow Pages | Pressed Flower | Reads With Spectacles | Silver Ink Streak | Bright Reading Lamps |
| Silas Scribble | Whispering Words | Golden Tassel | Reads With Spectacles | Gold Ink Streak | Loud Paper Shredders |
| Sam Script | Whispering Words | Ribbon Bookmark | Reads With Spectacles | Silver Ink Streak | Loud Paper Shredders |
| Readers Vance | Paper Folding | Pressed Flower | Reads Without Spectacles | Silver Ink Streak | Bright Reading Lamps |
| Tessa Tale | Whispering Words | Golden Tassel | Reads With Spectacles | Silver Ink Streak | Loud Paper Shredders |
| Libby Library | Book Teleporting | Ribbon Bookmark | Reads With Spectacles | Silver Ink Streak | Heavy Dust Dusters |
| Author Artie | Shadow Pages | Leather Strap | Reads Without Spectacles | Gold Ink Streak | Bright Reading Lamps |
| Rita Read | Book Teleporting | Metal Clip | Reads Without Spectacles | Gold Ink Streak | Bright Reading Lamps |
| Inkling Isaac | Shadow Pages | Ribbon Bookmark | Reads Without Spectacles | Gold Ink Streak | Bright Reading Lamps |
| Brooks Cover | Ink Blotting | Pressed Flower | Reads With Spectacles | Blue Ink Streak | Heavy Dust Dusters |
| Story Sterling | Paper Folding | Metal Clip | Reads With Spectacles | Silver Ink Streak | Heavy Dust Dusters |
| Walter Words | Shadow Pages | Pressed Flower | Reads Without Spectacles | Silver Ink Streak | Bright Reading Lamps |
| Gaby Guild | Whispering Words | Golden Tassel | Reads Without Spectacles | Gold Ink Streak | Bright Reading Lamps |
Clue 1
Fractions of a number
To narrow down the bookmark styles, the detective checked a fraction of the enchanted library inventory ledger.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
33
27
13
34
40
26
26
32
40
22
5
10
13
31
22
10
T
33
4
31
13
32
16
13
T
33
32
26
2
26
40
17
6/10 of 55 =T
1/8 of 40 =D
1/2 of 4 =C
5/10 of 54 =H
2/6 of 51 =P
2/4 of 20 =O
3/6 of 52 =L
4/10 of 40 =M
1/2 of 44 =N
3/6 of 8 =U
4/8 of 64 =A
2/4 of 26 =E
1/6 of 186 =S
4/8 of 80 =I
1/4 of 136 =V
0/15 letters found
Clue 2
Rounding
The librarian's magic catalog scanner only shows rounded numbers for ink energy levels.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
230
110
3700
900
3000
900
2300
3700
370
T
230
30
3700
4300
70
900
290
500
90
3700
1700
500
T
230
110
2900
3000
T
230
900
2300
3700
370
T
230
4300
370
430
3700
900
Round 231 to the nearest tenT
Round 2,869 to the nearest hundredO
Round 287 to the nearest tenF
Round 367 to the nearest tenC
Round 90 to the nearest tenN
Round 114 to the nearest tenH
Round 1,724 to the nearest hundredW
Round 508 to the nearest hundredI
Round 4,276 to the nearest hundredA
Round 72 to the nearest tenD
Round 853 to the nearest hundredS
Round 2,530 to the nearest thousandU
Round 3,735 to the nearest hundredE
Round 2,327 to the nearest hundredP
Round 433 to the nearest tenL
Round 29 to the nearest tenR
0/16 letters found
Clue 3
Addition
The detective added up all the returned book stacks to discover a witness note.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
B
9608
2489
5529
6466
9190
8276
3728
5529
6466
9190
8276
3665
3665
8276
5926
7653
7653
3224
5174
8276
9190
3224
5529
6896
8879
8276
9190
5529
3224
9075
3542 + 6066 =B
1769 + 1959 =L
4900 + 2753 =P
4383 + 2083 =G
1176 + 1313 =R
2801 + 6274 =F
1510 + 1714 =E
3707 + 2219 =O
2995 + 5884 =K
2308 + 4588 =N
4380 + 3896 =T
5993 + 3197 =H
2480 + 2694 =D
3265 + 2264 =I
2513 + 1152 =S
0/15 letters found
Clue 4
Subtraction
By subtracting the missing story pages from the total pile, a faint clue appeared on the desk.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
G
2816
5991
8124
3838
5769
7787
4075
7787
3644
1198
8415
5769
8716
3644
1198
3838
4268
4075
4556
1616
5769
3838
7787
5769
2714
4268
1616
4730
5769
1198
4730
5769
8124
4556
5999 - 3183 =G
11588 - 3464 =L
6160 - 2516 =K
12188 - 3472 =C
1980 - 782 =S
10584 - 4593 =O
8551 - 764 =N
5541 - 1466 =I
11578 - 3163 =P
7436 - 2706 =H
6432 - 2594 =D
6305 - 4689 =T
3676 - 962 =A
8035 - 2266 =E
5203 - 935 =R
8427 - 3871 =F
0/16 letters found
Clue 5
Fractions of a number — the last clue
The detective solved a puzzle involving a fraction of the rare spellbooks to unlock the final secret.
First solve each problem. Then find each answer in the list below and cross that sentence out. One sentence will be left — that's exactly what the villain did!
Step 1 — solve these
2/10 of 20 = ?
1/3 of 36 = ?
2/8 of 12 = ?
4/8 of 2 = ?
1/8 of 16 = ?
7/10 of 10 = ?
1/4 of 32 = ?
1/10 of 90 = ?
1/8 of 88 = ?
5/10 of 10 = ?
2/3 of 15 = ?
Step 2 — cross out the sentence with each answer
1.The villain spilled dark magic ink across the floor, then tied the corner with a bright golden tassel.
2.The villain vanished into the pages of a thick storybook, then tied the corner with a bright golden tassel.
3.The villain hid behind giant floating paper pages, then strapped the cover using a leather strap.
4.The villain hid behind giant floating paper pages, then marked the page with a silky ribbon bookmark.
5.The villain folded a map into a tiny paper bird, then clamped the chapter shut with a metal clip.
6.The villain whispered magic words from the ancient tome, then tied the corner with a bright golden tassel.
7.The villain folded a map into a tiny paper bird, then tied the corner with a bright golden tassel.
8.The villain folded a map into a tiny paper bird, then marked the page with a silky ribbon bookmark.
9.The villain hid behind giant floating paper pages, then tucked a pressed flower between the pages.
10.The villain whispered magic words from the ancient tome, then tucked a pressed flower between the pages.
11.The villain hid behind giant floating paper pages, then tied the corner with a bright golden tassel.
12.The villain vanished into the pages of a thick storybook, then strapped the cover using a leather strap.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Golden Bookmark
Culprit: Gaby Guild (Whispering Words · Golden Tassel · Reads Without Spectacles · Gold Ink Streak · Bright Reading Lamps)
- Clue 1 (Fractions of a number): "THE VILLAIN DOES NOT USE A METAL CLIP"6/10 of 55 = 33 (T) · 1/8 of 40 = 5 (D) · 1/2 of 4 = 2 (C) · 5/10 of 54 = 27 (H) · 2/6 of 51 = 17 (P) · 2/4 of 20 = 10 (O) · 3/6 of 52 = 26 (L) · 4/10 of 40 = 16 (M) · 1/2 of 44 = 22 (N) · 3/6 of 8 = 4 (U) · 4/8 of 64 = 32 (A) · 2/4 of 26 = 13 (E) · 1/6 of 186 = 31 (S) · 4/8 of 80 = 40 (I) · 1/4 of 136 = 34 (V)
- Clue 2 (Rounding): "THE SUSPECT READS FINE WITHOUT SPECTACLES"Round 231 to the nearest ten = 230 (T) · Round 2,869 to the nearest hundred = 2900 (O) · Round 287 to the nearest ten = 290 (F) · Round 367 to the nearest ten = 370 (C) · Round 90 to the nearest ten = 90 (N) · Round 114 to the nearest ten = 110 (H) · Round 1,724 to the nearest hundred = 1700 (W) · Round 508 to the nearest hundred = 500 (I) · Round 4,276 to the nearest hundred = 4300 (A) · Round 72 to the nearest ten = 70 (D) · Round 853 to the nearest hundred = 900 (S) · Round 2,530 to the nearest thousand = 3000 (U) · Round 3,735 to the nearest hundred = 3700 (E) · Round 2,327 to the nearest hundred = 2300 (P) · Round 433 to the nearest ten = 430 (L) · Round 29 to the nearest ten = 30 (R)
- Clue 3 (Addition): "BRIGHT LIGHTS STOPPED THE INK THIEF"3542 + 6066 = 9608 (B) · 1769 + 1959 = 3728 (L) · 4900 + 2753 = 7653 (P) · 4383 + 2083 = 6466 (G) · 1176 + 1313 = 2489 (R) · 2801 + 6274 = 9075 (F) · 1510 + 1714 = 3224 (E) · 3707 + 2219 = 5926 (O) · 2995 + 5884 = 8879 (K) · 2308 + 4588 = 6896 (N) · 4380 + 3896 = 8276 (T) · 5993 + 3197 = 9190 (H) · 2480 + 2694 = 5174 (D) · 3265 + 2264 = 5529 (I) · 2513 + 1152 = 3665 (S)
- Clue 4 (Subtraction): "GOLDEN INK SPECKS DRIFTED NEAR THE SHELF"5999 - 3183 = 2816 (G) · 11588 - 3464 = 8124 (L) · 6160 - 2516 = 3644 (K) · 12188 - 3472 = 8716 (C) · 1980 - 782 = 1198 (S) · 10584 - 4593 = 5991 (O) · 8551 - 764 = 7787 (N) · 5541 - 1466 = 4075 (I) · 11578 - 3163 = 8415 (P) · 7436 - 2706 = 4730 (H) · 6432 - 2594 = 3838 (D) · 6305 - 4689 = 1616 (T) · 3676 - 962 = 2714 (A) · 8035 - 2266 = 5769 (E) · 5203 - 935 = 4268 (R) · 8427 - 3871 = 4556 (F)
- Clue 5 (Fractions of a number): surviving statement (box 6) → Gaby Guild2/10 of 20 = 4 · 1/3 of 36 = 12 · 2/8 of 12 = 3 · 4/8 of 2 = 1 · 1/8 of 16 = 2 · 7/10 of 10 = 7 · 1/4 of 32 = 8 · 1/10 of 90 = 9 · 1/8 of 88 = 11 · 5/10 of 10 = 5 · 2/3 of 15 = 10
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Fractions of a number, Rounding, Addition, Subtraction
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Golden Bookmark — set in Whispering Willow Library
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects