Grade 5Reading: grades 5-6MultiplicationPlace valueRoundingFractions of a numberDivision
The Mystery of the Sunken Compass
A famous Golden Compass was stolen from the high vault at Stormy Atoll Museum! Detective, examine the clues, decode the evidence, and track down the culprit before they sail away.
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 Tool | Sky Gadget | Wandering Habit | Bandana Color | Trap Vulnerability |
|---|---|---|---|---|---|
| Dante Brooks | Brass Compass | Smoke Bomb | Taps Left Foot | Crimson Red | Loud Whistles |
| Lyra Song | Grappling Hook | Pocket Scope | Taps Right Foot | Midnight Black | Flash Powder |
| Captain Avery | Signal Flare | Echo Whistle | Taps Left Foot | Crimson Red | Flash Powder |
| Nora Drake | Grappling Hook | Echo Whistle | Taps Right Foot | Golden Yellow | Net Traps |
| Hugo Reyes | Sturdy Machete | Echo Whistle | Taps Right Foot | Crimson Red | Loud Whistles |
| Finn OConnor | Brass Compass | Pocket Scope | Taps Left Foot | Crimson Red | Loud Whistles |
| Vera Scott | Grappling Hook | Smoke Bomb | Taps Left Foot | Crimson Red | Loud Whistles |
| Freya Lind | Diving Bell | Smoke Bomb | Taps Right Foot | Crimson Red | Flash Powder |
| Jax River | Signal Flare | Wind Gauge | Taps Left Foot | Crimson Red | Loud Whistles |
| Clara Vance | Sturdy Machete | Smoke Bomb | Taps Right Foot | Golden Yellow | Flash Powder |
| Cyrus Stone | Signal Flare | Wind Gauge | Taps Right Foot | Crimson Red | Loud Whistles |
| Maya Lin | Sturdy Machete | Smoke Bomb | Taps Left Foot | Golden Yellow | Net Traps |
| Gideon Ray | Sturdy Machete | Echo Whistle | Taps Left Foot | Midnight Black | Loud Whistles |
| Zoe Chen | Signal Flare | Pocket Scope | Taps Right Foot | Crimson Red | Loud Whistles |
| Iris West | Diving Bell | Pocket Scope | Taps Left Foot | Crimson Red | Loud Whistles |
| Elena Cruz | Grappling Hook | Smoke Bomb | Taps Right Foot | Crimson Red | Net Traps |
| Leo Sterling | Brass Compass | Glider Pack | Taps Left Foot | Midnight Black | Loud Whistles |
| Talia Frost | Grappling Hook | Echo Whistle | Taps Left Foot | Golden Yellow | Flash Powder |
| Tobias Hale | Brass Compass | Echo Whistle | Taps Left Foot | Midnight Black | Loud Whistles |
| Orion Blake | Sturdy Machete | Smoke Bomb | Taps Left Foot | Crimson Red | Net Traps |
| Silas Finch | Diving Bell | Smoke Bomb | Taps Left Foot | Golden Yellow | Net Traps |
Clue 1
Multiplication facts (1-12)
To find where the rogue explorer fled, you calculate the total crate count stacked in equal rows across the supply deck.
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
96
16
90
66
64
66
21
90
60
T
96
11
20
90
66
120
20
T
96
64
66
90
18
25
49
120
11
4
18
64
4
90
8 × 12 =T
10 × 6 =C
10 × 9 =E
9 × 2 =A
8 × 8 =U
12 × 10 =N
5 × 5 =W
6 × 11 =S
8 × 2 =H
3 × 7 =P
4 × 1 =G
7 × 7 =I
1 × 11 =D
2 × 10 =O
0/14 letters found
Clue 2
Place value
A locked chest requires a code, where you examine the digit in the thousands place on the ship register.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
W
8000
200
80
500
600
70
70
70
700
W
8000
80
90
600
9000
80
700
400
400
200
500
300
80
90
600
200
30
10
600
2000
80
2000
20
20
80
What is the value of the 8 in 38,651?W
What is the value of the 2 in 65,821?O
What is the value of the 4 in 533,496?P
What is the value of the 8 in 464,783?T
What is the value of the 3 in 62,839?R
What is the value of the 7 in 52,873?S
What is the value of the 7 in 900,734?A
What is the value of the 9 in 779,318?M
What is the value of the 5 in 643,508?N
What is the value of the 6 in 751,692?E
What is the value of the 3 in 259,322?G
What is the value of the 2 in 92,747?F
What is the value of the 9 in 72,695?H
What is the value of the 2 in 45,243?I
What is the value of the 1 in 62,619?L
0/15 letters found
Clue 3
Rounding
The storm radar only gives approximate distances, so you round the flight path mileage to the nearest hundred.
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
500
900
20
2900
700
1700
1700
3700
700
50
230
3700
9000
9000
T
500
1100
290
290
20
430
130
90
1700
1100
1300
430
230
900
700
9000
T
500
1700
20
9000
Round 518 to the nearest hundredT
Round 2,931 to the nearest hundredV
Round 3,748 to the nearest hundredA
Round 945 to the nearest hundredH
Round 89 to the nearest tenY
Round 8,633 to the nearest thousandS
Round 127 to the nearest tenB
Round 718 to the nearest hundredI
Round 426 to the nearest tenD
Round 1,346 to the nearest hundredU
Round 233 to the nearest tenW
Round 1,715 to the nearest hundredL
Round 289 to the nearest tenP
Round 19 to the nearest tenE
Round 1,144 to the nearest hundredO
Round 48 to the nearest tenN
0/16 letters found
Clue 4
Fractions of a number
You divide the total map grid into equal sectors to check a fraction of the search zone for clues.
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
30
34
35
21
25
12
18
38
35
5
20
7
A
30
38
20
A
30
38
A
30
9
A
30
12
15
5
37
26
7
5
33
21
38
20
2/6 of 90 =A
6/8 of 44 =H
1/6 of 90 =L
6/8 of 16 =S
5/6 of 6 =E
1/10 of 70 =B
1/6 of 126 =I
3/6 of 52 =T
2/6 of 60 =D
1/5 of 90 =O
2/8 of 152 =N
1/3 of 111 =F
2/8 of 136 =C
3/10 of 30 =W
4/8 of 70 =R
5/6 of 30 =M
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
To figure out how many crew members were posted per lookout, you divide the total guards evenly among the towers.
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
4 ÷ 4 = ?
36 ÷ 4 = ?
88 ÷ 8 = ?
80 ÷ 8 = ?
35 ÷ 7 = ?
18 ÷ 9 = ?
16 ÷ 4 = ?
32 ÷ 4 = ?
7 ÷ 1 = ?
144 ÷ 12 = ?
30 ÷ 5 = ?
Step 2 — cross out the sentence with each answer
1.The villain bypassed the vault doors, then vanished behind a smoke bomb.
2.The villain disabled the alarm system, then vanished behind a smoke bomb.
3.The villain snatched the golden relic, then scanned the area with a pocket scope.
4.The villain snatched the golden relic, then calibrated the wind gauge.
5.The villain bypassed the vault doors, then calibrated the wind gauge.
6.The villain scaled the observation tower, then scanned the area with a pocket scope.
7.The villain scaled the observation tower, then vanished behind a smoke bomb.
8.The villain scaled the observation tower, then calibrated the wind gauge.
9.The villain unlocked the display case, then vanished behind a smoke bomb.
10.The villain bypassed the vault doors, then signaled crew with an echo whistle.
11.The villain unlocked the display case, then scanned the area with a pocket scope.
12.The villain snatched the golden relic, then signaled crew with an echo whistle.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Sunken Compass
Culprit: Iris West (Diving Bell · Pocket Scope · Taps Left Foot · Crimson Red · Loud Whistles)
- Clue 1 (Multiplication facts (1-12)): "THE SUSPECT DOES NOT USE A WIND GAUGE"8 × 12 = 96 (T) · 10 × 6 = 60 (C) · 10 × 9 = 90 (E) · 9 × 2 = 18 (A) · 8 × 8 = 64 (U) · 12 × 10 = 120 (N) · 5 × 5 = 25 (W) · 6 × 11 = 66 (S) · 8 × 2 = 16 (H) · 3 × 7 = 21 (P) · 4 × 1 = 4 (G) · 7 × 7 = 49 (I) · 1 × 11 = 11 (D) · 2 × 10 = 20 (O)
- Clue 2 (Place value): "WITNESS SAW THEM TAPPING THEIR LEFT FOOT"What is the value of the 8 in 38,651? = 8000 (W) · What is the value of the 2 in 65,821? = 20 (O) · What is the value of the 4 in 533,496? = 400 (P) · What is the value of the 8 in 464,783? = 80 (T) · What is the value of the 3 in 62,839? = 30 (R) · What is the value of the 7 in 52,873? = 70 (S) · What is the value of the 7 in 900,734? = 700 (A) · What is the value of the 9 in 779,318? = 9000 (M) · What is the value of the 5 in 643,508? = 500 (N) · What is the value of the 6 in 751,692? = 600 (E) · What is the value of the 3 in 259,322? = 300 (G) · What is the value of the 2 in 92,747? = 2000 (F) · What is the value of the 9 in 72,695? = 90 (H) · What is the value of the 2 in 45,243? = 200 (I) · What is the value of the 1 in 62,619? = 10 (L)
- Clue 3 (Rounding): "THE VILLAIN WAS STOPPED BY LOUD WHISTLES"Round 518 to the nearest hundred = 500 (T) · Round 2,931 to the nearest hundred = 2900 (V) · Round 3,748 to the nearest hundred = 3700 (A) · Round 945 to the nearest hundred = 900 (H) · Round 89 to the nearest ten = 90 (Y) · Round 8,633 to the nearest thousand = 9000 (S) · Round 127 to the nearest ten = 130 (B) · Round 718 to the nearest hundred = 700 (I) · Round 426 to the nearest ten = 430 (D) · Round 1,346 to the nearest hundred = 1300 (U) · Round 233 to the nearest ten = 230 (W) · Round 1,715 to the nearest hundred = 1700 (L) · Round 289 to the nearest ten = 290 (P) · Round 19 to the nearest ten = 20 (E) · Round 1,144 to the nearest hundred = 1100 (O) · Round 48 to the nearest ten = 50 (N)
- Clue 4 (Fractions of a number): "A CRIMSON RED BANDANA WAS LEFT BEHIND"2/6 of 90 = 30 (A) · 6/8 of 44 = 33 (H) · 1/6 of 90 = 15 (L) · 6/8 of 16 = 12 (S) · 5/6 of 6 = 5 (E) · 1/10 of 70 = 7 (B) · 1/6 of 126 = 21 (I) · 3/6 of 52 = 26 (T) · 2/6 of 60 = 20 (D) · 1/5 of 90 = 18 (O) · 2/8 of 152 = 38 (N) · 1/3 of 111 = 37 (F) · 2/8 of 136 = 34 (C) · 3/10 of 30 = 9 (W) · 4/8 of 70 = 35 (R) · 5/6 of 30 = 25 (M)
- Clue 5 (Division facts (1-12)): surviving statement (box 3) → Iris West4 ÷ 4 = 1 · 36 ÷ 4 = 9 · 88 ÷ 8 = 11 · 80 ÷ 8 = 10 · 35 ÷ 7 = 5 · 18 ÷ 9 = 2 · 16 ÷ 4 = 4 · 32 ÷ 4 = 8 · 7 ÷ 1 = 7 · 144 ÷ 12 = 12 · 30 ÷ 5 = 6
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Multiplication, Place value, Rounding, Fractions of a number, Division
- Reading level
- grades 5-6
- Theme
- The Mystery of the Sunken Compass — set in Stormy Atoll Museum
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects