Grade 4Reading: grades 5-6AdditionRoundingSubtractionMultiplicationDivision
The Whispering Island Caper
An ancient gold compass has vanished from the dig site! The Head Archaeologist needs your help. One of the visiting camp explorers is secretly a rogue agent. Follow the clues, solve the math mysteries, and track down the culprit before they escape the island!
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 | Primary Tool | Backup Gear | Writing Hand | Headwear | Main Fear |
|---|---|---|---|---|---|
| Anna | Signal Flare | Metal Detector | Right-Handed Grip | Safari Cap | Scared of Bats |
| Lily | Grappling Hook | Inflatable Raft | Left-Handed Grip | Safari Cap | Allergic to Pollen |
| Zoe | Climbing Claws | Walkie Talkie | Left-Handed Grip | Red Beanie | Scared of Bats |
| Emma | Climbing Claws | Metal Detector | Left-Handed Grip | Red Beanie | Allergic to Pollen |
| Owen | Decrypter Tablet | Night Vision Visor | Left-Handed Grip | Red Beanie | Allergic to Pollen |
| Ella | Signal Flare | Mini Drone | Left-Handed Grip | Red Beanie | Allergic to Pollen |
| Ruby | Laser Compass | Night Vision Visor | Left-Handed Grip | Red Beanie | Dislikes Mud |
| Sam | Decrypter Tablet | Inflatable Raft | Left-Handed Grip | Safari Cap | Allergic to Pollen |
| Caleb | Signal Flare | Metal Detector | Left-Handed Grip | Red Beanie | Allergic to Pollen |
| Jake | Climbing Claws | Night Vision Visor | Left-Handed Grip | Red Beanie | Scared of Bats |
| Jack | Climbing Claws | Metal Detector | Left-Handed Grip | Pith Helmet | Allergic to Pollen |
| Noah | Decrypter Tablet | Metal Detector | Right-Handed Grip | Safari Cap | Scared of Bats |
| Sadie | Climbing Claws | Inflatable Raft | Right-Handed Grip | Pith Helmet | Scared of Bats |
| Wyatt | Laser Compass | Metal Detector | Left-Handed Grip | Red Beanie | Allergic to Pollen |
| Mia | Laser Compass | Metal Detector | Right-Handed Grip | Red Beanie | Allergic to Pollen |
| Zack | Signal Flare | Mini Drone | Right-Handed Grip | Pith Helmet | Scared of Bats |
| Maya | Decrypter Tablet | Mini Drone | Right-Handed Grip | Safari Cap | Allergic to Pollen |
| Chloe | Decrypter Tablet | Mini Drone | Left-Handed Grip | Red Beanie | Allergic to Pollen |
| Leo | Decrypter Tablet | Mini Drone | Right-Handed Grip | Pith Helmet | Dislikes Mud |
| Grace | Climbing Claws | Night Vision Visor | Right-Handed Grip | Red Beanie | Allergic to Pollen |
| Finn | Laser Compass | Walkie Talkie | Left-Handed Grip | Safari Cap | Allergic to Pollen |
Clue 1
Addition
To find the first clue, we need to count and add up all the expedition supply crates left near the camp gate.
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
6235
7761
8371
T
6235
7761
7920
8371
4508
5946
8578
8371
8946
8411
8578
T
6235
2319
8946
8371
3228
5377
7920
8411
7920
5946
3477
8578
8411
8371
2566 + 3669 =T
5752 + 2826 =O
1586 + 2922 =F
4170 + 4776 =S
1470 + 1758 =A
5822 + 2549 =E
3336 + 2041 =M
5104 + 3307 =N
5494 + 2426 =I
993 + 1326 =U
4042 + 3719 =H
2834 + 3112 =D
2214 + 1263 =R
0/13 letters found
Clue 2
Rounding
The ancient security sensor only displays rounded numbers on its screen. Round the values to unlock the message.
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
5000
20
2000
900
430
300
230
9000
70
T
5000
1300
70
370
500
2000
50
3700
70
T
5000
20
130
300
2000
2900
T
5000
370
9000
70
230
Round 4,516 to the nearest thousandT
Round 2,866 to the nearest hundredF
Round 229 to the nearest tenP
Round 322 to the nearest hundredL
Round 3,728 to the nearest hundredW
Round 73 to the nearest tenI
Round 129 to the nearest tenA
Round 1,565 to the nearest thousandE
Round 373 to the nearest tenG
Round 18 to the nearest tenH
Round 53 to the nearest tenD
Round 1,262 to the nearest hundredS
Round 9,001 to the nearest thousandR
Round 430 to the nearest tenU
Round 897 to the nearest hundredC
Round 495 to the nearest hundredN
0/16 letters found
Clue 3
Subtraction
Some tools went missing from our toolkit. Subtract the lost gear from our total to reveal the hidden trail.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
P
3264
4531
3333
3333
4870
1842
5228
8412
7317
4870
6449
5809
4870
2567
1842
4870
4870
6293
2284
1842
4591
4058
2284
3333
3333
8412
2284
1842
8897
3333
4870
4870
5252 - 1988 =P
8727 - 3499 =M
10719 - 2307 =A
12484 - 3587 =F
6304 - 11 =Z
9397 - 4806 =G
8498 - 1181 =D
3897 - 564 =L
6055 - 3488 =S
8018 - 2209 =H
8264 - 3394 =E
6900 - 4616 =I
7288 - 839 =T
2738 - 896 =N
7062 - 2531 =O
5709 - 1651 =V
0/16 letters found
Clue 4
Multiplication facts (1-12)
The temple floor is made of square tiles arranged in equal rows. Multiply the rows to find the secret button.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
15
1
14
4
48
96
30
48
64
30
A
15
42
18
30
32
A
15
20
4
30
80
144
A
15
144
144
28
30
20
1
30
42
30
3 × 5 =A
4 × 8 =W
2 × 7 =O
3 × 6 =I
8 × 8 =B
8 × 6 =D
10 × 8 =F
4 × 7 =H
5 × 4 =S
4 × 1 =L
1 × 1 =C
12 × 12 =T
8 × 12 =R
7 × 6 =N
3 × 10 =E
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
We must divide our survival rations equally among the rescue teams to calculate the final coordinate.
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
44 ÷ 11 = ?
30 ÷ 3 = ?
14 ÷ 2 = ?
108 ÷ 9 = ?
56 ÷ 7 = ?
6 ÷ 2 = ?
5 ÷ 5 = ?
30 ÷ 6 = ?
77 ÷ 7 = ?
45 ÷ 5 = ?
60 ÷ 10 = ?
Step 2 — cross out the sentence with each answer
1.The villain scaled the wall with climbing claws, then whispered into a walkie talkie.
2.The villain unlocked the decrypter tablet, then activated a night vision visor.
3.The villain fired a signal flare, then inflated a rubber raft.
4.The villain scaled the wall with climbing claws, then swept the area with a metal detector.
5.The villain swung on a grappling hook, then inflated a rubber raft.
6.The villain swung on a grappling hook, then launched a mini drone.
7.The villain fired a signal flare, then swept the area with a metal detector.
8.The villain scanned with a laser compass, then activated a night vision visor.
9.The villain swung on a grappling hook, then whispered into a walkie talkie.
10.The villain scanned with a laser compass, then swept the area with a metal detector.
11.The villain scanned with a laser compass, then inflated a rubber raft.
12.The villain unlocked the decrypter tablet, then swept the area with a metal detector.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Whispering Island Caper
Culprit: Owen (Decrypter Tablet · Night Vision Visor · Left-Handed Grip · Red Beanie · Allergic to Pollen)
- Clue 1 (Addition): "THE THIEF DOES NOT USE A MINI DRONE"2566 + 3669 = 6235 (T) · 5752 + 2826 = 8578 (O) · 1586 + 2922 = 4508 (F) · 4170 + 4776 = 8946 (S) · 1470 + 1758 = 3228 (A) · 5822 + 2549 = 8371 (E) · 3336 + 2041 = 5377 (M) · 5104 + 3307 = 8411 (N) · 5494 + 2426 = 7920 (I) · 993 + 1326 = 2319 (U) · 4042 + 3719 = 7761 (H) · 2834 + 3112 = 5946 (D) · 2214 + 1263 = 3477 (R)
- Clue 2 (Rounding): "THE CULPRIT SIGNED WITH A LEFT GRIP"Round 4,516 to the nearest thousand = 5000 (T) · Round 2,866 to the nearest hundred = 2900 (F) · Round 229 to the nearest ten = 230 (P) · Round 322 to the nearest hundred = 300 (L) · Round 3,728 to the nearest hundred = 3700 (W) · Round 73 to the nearest ten = 70 (I) · Round 129 to the nearest ten = 130 (A) · Round 1,565 to the nearest thousand = 2000 (E) · Round 373 to the nearest ten = 370 (G) · Round 18 to the nearest ten = 20 (H) · Round 53 to the nearest ten = 50 (D) · Round 1,262 to the nearest hundred = 1300 (S) · Round 9,001 to the nearest thousand = 9000 (R) · Round 430 to the nearest ten = 430 (U) · Round 897 to the nearest hundred = 900 (C) · Round 495 to the nearest hundred = 500 (N)
- Clue 3 (Subtraction): "POLLEN MADE THE SNEEZING VILLAIN FLEE"5252 - 1988 = 3264 (P) · 8727 - 3499 = 5228 (M) · 10719 - 2307 = 8412 (A) · 12484 - 3587 = 8897 (F) · 6304 - 11 = 6293 (Z) · 9397 - 4806 = 4591 (G) · 8498 - 1181 = 7317 (D) · 3897 - 564 = 3333 (L) · 6055 - 3488 = 2567 (S) · 8018 - 2209 = 5809 (H) · 8264 - 3394 = 4870 (E) · 6900 - 4616 = 2284 (I) · 7288 - 839 = 6449 (T) · 2738 - 896 = 1842 (N) · 7062 - 2531 = 4531 (O) · 5709 - 1651 = 4058 (V)
- Clue 4 (Multiplication facts (1-12)): "A COLD RED BEANIE WAS LEFT AT THE SCENE"3 × 5 = 15 (A) · 4 × 8 = 32 (W) · 2 × 7 = 14 (O) · 3 × 6 = 18 (I) · 8 × 8 = 64 (B) · 8 × 6 = 48 (D) · 10 × 8 = 80 (F) · 4 × 7 = 28 (H) · 5 × 4 = 20 (S) · 4 × 1 = 4 (L) · 1 × 1 = 1 (C) · 12 × 12 = 144 (T) · 8 × 12 = 96 (R) · 7 × 6 = 42 (N) · 3 × 10 = 30 (E)
- Clue 5 (Division facts (1-12)): surviving statement (box 2) → Owen44 ÷ 11 = 4 · 30 ÷ 3 = 10 · 14 ÷ 2 = 7 · 108 ÷ 9 = 12 · 56 ÷ 7 = 8 · 6 ÷ 2 = 3 · 5 ÷ 5 = 1 · 30 ÷ 6 = 5 · 77 ÷ 7 = 11 · 45 ÷ 5 = 9 · 60 ÷ 10 = 6
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Addition, Rounding, Subtraction, Multiplication, Division
- Reading level
- grades 5-6
- Theme
- The Whispering Island Caper — set in the ancient Temple of Whispering Island
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects