Grade 4Reading: grades 5-6RoundingAdditionSubtractionMultiplicationDivision
Mystery of the Sunken Compass
Someone raided the camp tent and took the ancient golden map wheel! Follow the clues to find out who stole it.
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 | Expedition Gear | Camp Gadget | Compass Hand | Hat Style | Jungle Hazard |
|---|---|---|---|---|---|
| Morgan Vance | Machete Pack | Tracker Chip | Right Handed | Leather Cap | Swarm Insects |
| Rowan Wilder | Machete Pack | Laser Pointer | Left Handed | Leather Cap | Mud Pits |
| Taylor Reed | Rope Launcher | Pocket Radio | Right Handed | Pith Helmet | Poison Ivy |
| Sam Rivera | Rope Launcher | Laser Pointer | Left Handed | Pith Helmet | Poison Ivy |
| Reece Finch | Signal Whistle | Night Visor | Right Handed | Leather Cap | Mud Pits |
| Emerson Cole | Machete Pack | Tracker Chip | Right Handed | Leather Cap | Mud Pits |
| Hayden Brooks | Rope Launcher | Pocket Radio | Left Handed | Canvas Fedora | Poison Ivy |
| Parker Stone | Signal Flare | Tracker Chip | Right Handed | Pith Helmet | Poison Ivy |
| Sage Bennett | Solar Lantern | Mini Drone | Left Handed | Leather Cap | Mud Pits |
| Dakota Hayes | Machete Pack | Mini Drone | Right Handed | Leather Cap | Mud Pits |
| Dallas Croft | Machete Pack | Laser Pointer | Right Handed | Leather Cap | Swarm Insects |
| Ellis Hunter | Signal Whistle | Mini Drone | Right Handed | Leather Cap | Poison Ivy |
| Jamie West | Signal Flare | Tracker Chip | Left Handed | Leather Cap | Poison Ivy |
| Kai Logan | Signal Whistle | Mini Drone | Right Handed | Leather Cap | Mud Pits |
| Kendall Marsh | Rope Launcher | Tracker Chip | Left Handed | Canvas Fedora | Mud Pits |
| Lane Sterling | Solar Lantern | Mini Drone | Left Handed | Pith Helmet | Swarm Insects |
| Riley Sterling | Machete Pack | Mini Drone | Left Handed | Canvas Fedora | Poison Ivy |
| Casey Thorne | Signal Flare | Night Visor | Right Handed | Pith Helmet | Poison Ivy |
| Alex Drake | Signal Flare | Night Visor | Left Handed | Leather Cap | Poison Ivy |
| Jordan Blake | Signal Flare | Laser Pointer | Right Handed | Leather Cap | Mud Pits |
| Peyton Hale | Rope Launcher | Mini Drone | Right Handed | Canvas Fedora | Mud Pits |
Clue 1
Rounding
The digital camp radar rounds all distant movement markers to the nearest hundred meters.
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
1700
5000
130
900
200
130
300
70
20
430
20
200
30
T
1700
4300
900
130
300
T
1700
2900
300
230
70
130
2900
230
5000
430
7000
Round 1,732 to the nearest hundredT
Round 201 to the nearest hundredN
Round 912 to the nearest hundredS
Round 306 to the nearest hundredA
Round 426 to the nearest tenI
Round 226 to the nearest tenC
Round 74 to the nearest tenK
Round 134 to the nearest tenE
Round 6,769 to the nearest thousandP
Round 4,603 to the nearest thousandH
Round 16 to the nearest tenD
Round 29 to the nearest tenO
Round 2,931 to the nearest hundredR
Round 4,311 to the nearest hundredU
0/14 letters found
Clue 2
Addition
You gather up the loose supply logs left behind and total all the dropped gear crates.
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
4477
2315
3670
3487
4059
3487
9056
3670
6948
T
4477
2315
3670
9366
4410
6948
6808
5471
9056
3059
3487
3487
8658
3575
6699
8658
4647
2315
T
4477
2315
3059
3575
4410
1759 + 2718 =T
1037 + 2022 =A
2667 + 5991 =I
2469 + 1106 =N
3363 + 3445 =O
3542 + 1929 =M
1666 + 1821 =S
2830 + 1580 =D
1726 + 1944 =E
3125 + 3574 =R
1365 + 950 =H
5141 + 3915 =P
3150 + 1497 =G
4978 + 4388 =L
2196 + 1863 =U
4449 + 2499 =C
0/16 letters found
Clue 3
Subtraction
Comparing the full inventory list against remaining items shows exactly how much is missing.
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
7456
7478
1301
8077
3474
3783
4841
1864
T
7456
2019
3474
4357
T
7456
6806
1864
4295
4295
1301
4841
4128
4295
8077
5018
1143
4128
4841
4295
1864
T
7456
4357
8570 - 1114 =T
8842 - 4485 =S
6377 - 1359 =Y
8609 - 3768 =D
8079 - 3784 =P
6315 - 2187 =U
10244 - 2766 =H
7637 - 4163 =A
4564 - 3263 =E
2939 - 920 =W
3788 - 5 =N
4172 - 2308 =I
2317 - 1174 =M
12580 - 4503 =B
9206 - 2400 =R
0/15 letters found
Clue 4
Multiplication facts (1-12)
The main trail splits into equal grids so you calculate total square meters searched.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
S
32
56
40
9
9
2
3
44
2
45
90
6
22
55
45
9
6
55
28
9
50
2
45
9
28
2
90
72
45
56
4 × 8 =S
9 × 10 =R
11 × 5 =G
7 × 8 =P
5 × 8 =O
9 × 1 =T
9 × 8 =C
9 × 5 =A
6 × 1 =I
5 × 10 =L
11 × 4 =W
1 × 3 =D
4 × 7 =H
11 × 2 =N
2 × 1 =E
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
You divide the leftover energy rations equally among search teams to double check squad routes.
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
3 ÷ 1 = ?
48 ÷ 4 = ?
50 ÷ 10 = ?
24 ÷ 12 = ?
36 ÷ 6 = ?
90 ÷ 10 = ?
56 ÷ 7 = ?
44 ÷ 11 = ?
56 ÷ 8 = ?
44 ÷ 4 = ?
120 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain shot a bright beacon, then aimed a red laser.
2.The villain sounded the alarm, then tuned the pocket radio.
3.The villain hacked through vines, then scanned with a drone.
4.The villain lit up the dark trail, then dropped a tracker chip.
5.The villain sounded the alarm, then scanned with a drone.
6.The villain fired a climbing line, then flipped on night vision.
7.The villain sounded the alarm, then aimed a red laser.
8.The villain hacked through vines, then aimed a red laser.
9.The villain lit up the dark trail, then tuned the pocket radio.
10.The villain hacked through vines, then tuned the pocket radio.
11.The villain shot a bright beacon, then dropped a tracker chip.
12.The villain sounded the alarm, then flipped on night vision.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — Mystery of the Sunken Compass
Culprit: Jordan Blake (Signal Flare · Laser Pointer · Right Handed · Leather Cap · Mud Pits)
- Clue 1 (Rounding): "THE SNEAK DID NOT USE A TRACKER CHIP"Round 1,732 to the nearest hundred = 1700 (T) · Round 201 to the nearest hundred = 200 (N) · Round 912 to the nearest hundred = 900 (S) · Round 306 to the nearest hundred = 300 (A) · Round 426 to the nearest ten = 430 (I) · Round 226 to the nearest ten = 230 (C) · Round 74 to the nearest ten = 70 (K) · Round 134 to the nearest ten = 130 (E) · Round 6,769 to the nearest thousand = 7000 (P) · Round 4,603 to the nearest thousand = 5000 (H) · Round 16 to the nearest ten = 20 (D) · Round 29 to the nearest ten = 30 (O) · Round 2,931 to the nearest hundred = 2900 (R) · Round 4,311 to the nearest hundred = 4300 (U)
- Clue 2 (Addition): "THE SUSPECT HELD COMPASS IN RIGHT HAND"1759 + 2718 = 4477 (T) · 1037 + 2022 = 3059 (A) · 2667 + 5991 = 8658 (I) · 2469 + 1106 = 3575 (N) · 3363 + 3445 = 6808 (O) · 3542 + 1929 = 5471 (M) · 1666 + 1821 = 3487 (S) · 2830 + 1580 = 4410 (D) · 1726 + 1944 = 3670 (E) · 3125 + 3574 = 6699 (R) · 1365 + 950 = 2315 (H) · 5141 + 3915 = 9056 (P) · 3150 + 1497 = 4647 (G) · 4978 + 4388 = 9366 (L) · 2196 + 1863 = 4059 (U) · 4449 + 2499 = 6948 (C)
- Clue 3 (Subtraction): "THE BANDIT WAS TRIPPED UP BY MUD PITS"8570 - 1114 = 7456 (T) · 8842 - 4485 = 4357 (S) · 6377 - 1359 = 5018 (Y) · 8609 - 3768 = 4841 (D) · 8079 - 3784 = 4295 (P) · 6315 - 2187 = 4128 (U) · 10244 - 2766 = 7478 (H) · 7637 - 4163 = 3474 (A) · 4564 - 3263 = 1301 (E) · 2939 - 920 = 2019 (W) · 3788 - 5 = 3783 (N) · 4172 - 2308 = 1864 (I) · 2317 - 1174 = 1143 (M) · 12580 - 4503 = 8077 (B) · 9206 - 2400 = 6806 (R)
- Clue 4 (Multiplication facts (1-12)): "SPOTTED WEARING A TIGHT LEATHER CAP"4 × 8 = 32 (S) · 9 × 10 = 90 (R) · 11 × 5 = 55 (G) · 7 × 8 = 56 (P) · 5 × 8 = 40 (O) · 9 × 1 = 9 (T) · 9 × 8 = 72 (C) · 9 × 5 = 45 (A) · 6 × 1 = 6 (I) · 5 × 10 = 50 (L) · 11 × 4 = 44 (W) · 1 × 3 = 3 (D) · 4 × 7 = 28 (H) · 11 × 2 = 22 (N) · 2 × 1 = 2 (E)
- Clue 5 (Division facts (1-12)): surviving statement (box 1) → Jordan Blake3 ÷ 1 = 3 · 48 ÷ 4 = 12 · 50 ÷ 10 = 5 · 24 ÷ 12 = 2 · 36 ÷ 6 = 6 · 90 ÷ 10 = 9 · 56 ÷ 7 = 8 · 44 ÷ 11 = 4 · 56 ÷ 8 = 7 · 44 ÷ 4 = 11 · 120 ÷ 12 = 10
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 5-6
- Theme
- Mystery of the Sunken Compass — set in Hidden Canopy Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects