Grade 6Reading: grades 3-4PercentagesExponentsOrder of operationsMultiplicationDivision
The Secret of Sunken Island
Captain Sandy reported that the golden lighthouse key was taken from the cove office. The detective team must crack the island clues to reveal the guilty Sea Rogue.
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 | Main Gadget | Extra Gear | Dominant Hand | Hair Style | Foiled By |
|---|---|---|---|---|---|
| Lookout Lou | Pocket Telescope | Brass Lantern | Left Handed | Braided Brown | Squeaky Boots |
| Officer Owen | Glider Wings | Brass Lantern | Left Handed | Braided Brown | Loud Bell |
| Pilot Penny | Glider Wings | Brass Lantern | Right Handed | Spiky Red | Bright Flashlight |
| Beacon Ben | Grappling Hook | Brass Lantern | Left Handed | Curly Black | Squeaky Boots |
| Navigator Pete | Glider Wings | Sonar Watch | Left Handed | Spiky Red | Bright Flashlight |
| Tide Toby | Grappling Hook | Map Decryption | Left Handed | Braided Brown | Squeaky Boots |
| Harbor Holly | Glider Wings | Brass Lantern | Left Handed | Spiky Red | Bright Flashlight |
| Deckhand Drew | Glider Wings | Map Decryption | Left Handed | Curly Black | Squeaky Boots |
| Diver Dan | Grappling Hook | Whistle Alarm | Left Handed | Spiky Red | Loud Bell |
| Ranger Ray | Grappling Hook | Whistle Alarm | Left Handed | Curly Black | Squeaky Boots |
| Guide Gail | Glider Wings | Whistle Alarm | Right Handed | Braided Brown | Squeaky Boots |
| Scout Sean | Grappling Hook | Brass Lantern | Left Handed | Braided Brown | Bright Flashlight |
| Fisher Finn | Compass Lock | Sonar Watch | Left Handed | Braided Brown | Squeaky Boots |
| Ranger Rick | Pocket Telescope | Brass Lantern | Right Handed | Braided Brown | Squeaky Boots |
| Marina Mia | Glider Wings | Whistle Alarm | Left Handed | Spiky Red | Loud Bell |
| Marina Maya | Glider Wings | Signal Flares | Left Handed | Braided Brown | Squeaky Boots |
| Officer Clara | Pocket Telescope | Map Decryption | Left Handed | Spiky Red | Squeaky Boots |
| Captain Sandy | Glider Wings | Sonar Watch | Left Handed | Braided Brown | Squeaky Boots |
| Diver Daisy | Glider Wings | Signal Flares | Right Handed | Braided Brown | Loud Bell |
| Beacon Bella | Compass Lock | Sonar Watch | Right Handed | Curly Black | Squeaky Boots |
| Sailor Sara | Compass Lock | Signal Flares | Right Handed | Spiky Red | Bright Flashlight |
Clue 1
Percentages
The harbor battery panel shows energy percentages needed to open the lock box.
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
17
26
4
30
21
38
38
10
21
16
13
27
4
24
16
27
T
17
39
24
4
22
10
44
13
4
9
23
12
44
T
17
21
27
16
50% of 34 =T
40% of 30 =Y
40% of 110 =P
10% of 240 =S
50% of 8 =E
25% of 92 =R
5% of 200 =A
75% of 36 =O
10% of 160 =N
60% of 15 =C
75% of 40 =V
25% of 156 =U
25% of 152 =L
50% of 26 =D
5% of 440 =M
25% of 84 =I
50% of 52 =H
0/17 letters found
Clue 2
Exponents
A mystery chest features a keypad powered by repeated multiplying powers.
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
49
9
324
361
64
8
8
8
256
W
49
256
125
64
36
324
27
256
361
216
64
216
4
32
9
361
324
225
361
324
27
64
216
225
225
32
7^2 =W
2^5 =R
2^2 =P
6^3 =D
19^2 =N
6^2 =F
15^2 =O
18^2 =T
4^3 =E
2^3 =S
4^4 =A
5^3 =L
3^2 =I
3^3 =H
0/14 letters found
Clue 3
Order of operations
Captain Sandy found a chart where operations must be solved in exact step order.
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
60
69
24
29
57
41
41
50
57
59
7
50
80
80
T
60
54
38
38
24
40
15
45
80
76
48
24
50
31
45
15
54
54
T
60
80
7 × 9 - 3 =T
4 × 11 - 29 =B
11 + 6 × 3 =V
41 + 2 × 2 =Y
10 × 6 - 12 =U
12 × 5 - 3 =I
7 × 10 - 1 =H
6 × 8 - 7 =L
51 + 4 × 2 =N
20 + 8 × 7 =Q
6 × 11 - 26 =D
2 × 11 - 15 =W
64 + 2 × 8 =S
26 + 3 × 8 =A
42 + 2 × 6 =O
3 × 11 - 2 =K
5 × 8 - 16 =E
4 × 10 - 2 =P
0/18 letters found
Clue 4
Multiplication facts (1-12)
The dock master stacked supply crates in equal groups across the wooden pier.
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
7
18
63
132
55
90
45
66
18
10
24
18
45
55
144
10
132
22
18
22
36
22
100
24
55
22
45
18
24
90
22
144
63
40
96
7 × 1 =B
11 × 6 =I
2 × 11 =E
11 × 5 =N
9 × 7 =O
9 × 5 =A
10 × 10 =F
8 × 5 =C
3 × 6 =R
12 × 2 =T
1 × 10 =S
8 × 12 =K
11 × 12 =W
9 × 4 =L
10 × 9 =H
12 × 12 =D
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
The search crew divided found brass coins equally among all patrol boats.
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
84 ÷ 12 = ?
132 ÷ 11 = ?
60 ÷ 12 = ?
64 ÷ 8 = ?
42 ÷ 7 = ?
4 ÷ 1 = ?
99 ÷ 11 = ?
90 ÷ 9 = ?
8 ÷ 4 = ?
18 ÷ 6 = ?
55 ÷ 5 = ?
Step 2 — cross out the sentence with each answer
1.The villain scouted the harbor using a pocket telescope, then lit the path with a brass lantern.
2.The villain scouted the harbor using a pocket telescope, then tracked the route with a sonar watch.
3.The villain swung across the dock using a grappling hook, then lit the path with a brass lantern.
4.The villain swung across the dock using a grappling hook, then decoded the symbols with map decryption.
5.The villain zipped over the water using glider wings, then tracked the route with a sonar watch.
6.The villain bypassed the gate using a compass lock, then decoded the symbols with map decryption.
7.The villain zipped over the water using glider wings, then signaled allies with signal flares.
8.The villain zipped over the water using glider wings, then decoded the symbols with map decryption.
9.The villain scouted the harbor using a pocket telescope, then alerted guards with a whistle alarm.
10.The villain scouted the harbor using a pocket telescope, then signaled allies with signal flares.
11.The villain swung across the dock using a grappling hook, then alerted guards with a whistle alarm.
12.The villain bypassed the gate using a compass lock, then tracked the route with a sonar watch.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Secret of Sunken Island
Culprit: Lookout Lou (Pocket Telescope · Brass Lantern · Left Handed · Braided Brown · Squeaky Boots)
- Clue 1 (Percentages): "THE VILLAIN DOES NOT USE MAP DECRYPTION"50% of 34 = 17 (T) · 40% of 30 = 12 (Y) · 40% of 110 = 44 (P) · 10% of 240 = 24 (S) · 50% of 8 = 4 (E) · 25% of 92 = 23 (R) · 5% of 200 = 10 (A) · 75% of 36 = 27 (O) · 10% of 160 = 16 (N) · 60% of 15 = 9 (C) · 75% of 40 = 30 (V) · 25% of 156 = 39 (U) · 25% of 152 = 38 (L) · 50% of 26 = 13 (D) · 5% of 440 = 22 (M) · 25% of 84 = 21 (I) · 50% of 52 = 26 (H)
- Clue 2 (Exponents): "WITNESS SAW A LEFT HANDED PRINT ON THE DOOR"7^2 = 49 (W) · 2^5 = 32 (R) · 2^2 = 4 (P) · 6^3 = 216 (D) · 19^2 = 361 (N) · 6^2 = 36 (F) · 15^2 = 225 (O) · 18^2 = 324 (T) · 4^3 = 64 (E) · 2^3 = 8 (S) · 4^4 = 256 (A) · 5^3 = 125 (L) · 3^2 = 9 (I) · 3^3 = 27 (H)
- Clue 3 (Order of operations): "THE VILLAIN WAS STOPPED BY SQUEAKY BOOTS"7 × 9 - 3 = 60 (T) · 4 × 11 - 29 = 15 (B) · 11 + 6 × 3 = 29 (V) · 41 + 2 × 2 = 45 (Y) · 10 × 6 - 12 = 48 (U) · 12 × 5 - 3 = 57 (I) · 7 × 10 - 1 = 69 (H) · 6 × 8 - 7 = 41 (L) · 51 + 4 × 2 = 59 (N) · 20 + 8 × 7 = 76 (Q) · 6 × 11 - 26 = 40 (D) · 2 × 11 - 15 = 7 (W) · 64 + 2 × 8 = 80 (S) · 26 + 3 × 8 = 50 (A) · 42 + 2 × 6 = 54 (O) · 3 × 11 - 2 = 31 (K) · 5 × 8 - 16 = 24 (E) · 4 × 10 - 2 = 38 (P)
- Clue 4 (Multiplication facts (1-12)): "BROWN HAIR STRANDS WERE LEFT NEAR THE DOCK"7 × 1 = 7 (B) · 11 × 6 = 66 (I) · 2 × 11 = 22 (E) · 11 × 5 = 55 (N) · 9 × 7 = 63 (O) · 9 × 5 = 45 (A) · 10 × 10 = 100 (F) · 8 × 5 = 40 (C) · 3 × 6 = 18 (R) · 12 × 2 = 24 (T) · 1 × 10 = 10 (S) · 8 × 12 = 96 (K) · 11 × 12 = 132 (W) · 9 × 4 = 36 (L) · 10 × 9 = 90 (H) · 12 × 12 = 144 (D)
- Clue 5 (Division facts (1-12)): surviving statement (box 1) → Lookout Lou84 ÷ 12 = 7 · 132 ÷ 11 = 12 · 60 ÷ 12 = 5 · 64 ÷ 8 = 8 · 42 ÷ 7 = 6 · 4 ÷ 1 = 4 · 99 ÷ 11 = 9 · 90 ÷ 9 = 10 · 8 ÷ 4 = 2 · 18 ÷ 6 = 3 · 55 ÷ 5 = 11
About this mystery
- Grade level
- Grade 6 math
- Math topics
- Percentages, Exponents, Order of operations, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Secret of Sunken Island — set in Sunken Island Cove
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects