Grade 7Reading: grades 7-9Fractions of a numberIntegersPercentagesOrder of operations
The Whispering Isle Academy Mystery
A high-tech relic has been swiped from the secure vaults of the Whispering Isle Academy. The campus is on lockdown, and the Academy Curator needs your team to analyze the telemetry data, decode the clues, and unmask the rogue recruit 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 | adventure gear | specialist skill | gear placement | climbing helmet color | vulnerability |
|---|---|---|---|---|---|
| Zuri Patel | grappling glove | drone hacking | holstered on right | matte black helmet | magnetic sticky traps |
| Paige Archer | laser torch | vault cracking | holstered on left | matte black helmet | bright strobe lights |
| Cole Bishop | decoy drone | drone hacking | holstered on left | matte black helmet | magnetic sticky traps |
| Luna Drake | glider cape | signal jamming | holstered on left | neon blue helmet | magnetic sticky traps |
| Xander Finch | grappling glove | signal jamming | holstered on left | neon blue helmet | bright strobe lights |
| Kira Thorne | sonar visor | vault cracking | holstered on left | blaze orange helmet | high frequency sirens |
| Damian Ryder | sonar visor | drone hacking | holstered on left | matte black helmet | bright strobe lights |
| Brody Stone | grappling glove | stealth climbing | holstered on left | blaze orange helmet | bright strobe lights |
| Nadia Chen | glider cape | drone hacking | holstered on right | matte black helmet | bright strobe lights |
| Maya Sterling | decoy drone | vault cracking | holstered on right | matte black helmet | high frequency sirens |
| Leo Vance | laser torch | drone hacking | holstered on left | blaze orange helmet | high frequency sirens |
| Jax Taylor | laser torch | vault cracking | holstered on left | neon blue helmet | high frequency sirens |
| Gavin Knox | grappling glove | vault cracking | holstered on left | blaze orange helmet | bright strobe lights |
| Elena Rostova | sonar visor | stealth climbing | holstered on right | matte black helmet | bright strobe lights |
| Tessa Brooks | glider cape | signal jamming | holstered on left | matte black helmet | bright strobe lights |
| Chloe Vale | decoy drone | map decoding | holstered on left | matte black helmet | bright strobe lights |
| Zoe Mercer | glider cape | signal jamming | holstered on left | blaze orange helmet | high frequency sirens |
| Sienna Frost | grappling glove | drone hacking | holstered on right | blaze orange helmet | high frequency sirens |
| Rider Cruz | laser torch | map decoding | holstered on right | neon blue helmet | bright strobe lights |
| Marcus Flint | glider cape | vault cracking | holstered on left | matte black helmet | high frequency sirens |
| Devon Hayes | sonar visor | vault cracking | holstered on left | matte black helmet | bright strobe lights |
Clue 1
Fractions of a number
The academy security console is locked behind a fractional key. We need to analyze a portion of the active network ports to bypass the firewall and find our first lead.
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
39
35
48
53
14
21
21
18
14
56
3
30
48
29
56
30
T
39
58
29
48
59
18
12
3
48
37
30
3
14
56
2
1/4 of 156 =T
2/6 of 42 =I
4/6 of 72 =E
1/6 of 174 =S
1/4 of 72 =A
2/4 of 112 =N
1/3 of 159 =V
3/4 of 28 =L
1/5 of 175 =H
4/10 of 5 =G
4/8 of 118 =M
1/3 of 174 =U
5/8 of 48 =O
2/6 of 36 =P
5/10 of 74 =C
2/4 of 6 =D
0/16 letters found
Clue 2
Integers
Deep in the subterranean tunnels, the temperature sensors register rapid rises and falls in elevation. Tracking these integer shifts will pinpoint where the intruder fled.
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
30
6
3
29
3
11
29
28
23
13
3
T
30
3
2
T
30
3
13
7
3
17
23
28
11
T
30
6
3
4
3
9
T
30
26 - (-4) =T
(-9) + 37 =O
17 - (-12) =S
5 - (-12) =A
(-9) + 22 =D
2 - (-9) =N
(-15) + 24 =F
(-6) + 12 =H
(-6) + 10 =L
(-13) + 16 =E
19 - (-4) =R
(-15) + 22 =G
(-8) + 10 =C
0/13 letters found
Clue 3
Percentages
The backup energy grid is draining rapidly. To restore the lights, we must calculate the exact percentage of power remaining in the emergency battery banks.
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
53
55
58
51
14
51
41
58
23
T
53
40
4
8
19
43
58
43
40
27
40
57
8
32
55
T
53
51
T
53
57
34
40
58
51
20% of 265 =T
50% of 82 =P
40% of 145 =E
25% of 172 =D
25% of 220 =H
20% of 170 =O
5% of 800 =B
50% of 64 =G
10% of 80 =I
5% of 380 =N
10% of 230 =C
10% of 40 =L
10% of 570 =R
50% of 102 =S
10% of 270 =Y
20% of 70 =U
0/16 letters found
Clue 4
Order of operations
The vault door uses a strict chronological passcode. Solving this multi-step priority sequence unlocks the security cameras pointing at the courtyard.
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
66
23
21
44
7
115
21
13
76
103
97
21
106
106
44
116
21
115
40
120
92
12
12
103
104
40
46
116
21
103
40
54 + 4 × 3 =B
87 + 4 × 7 =P
31 + 8 × 9 =T
3 × 9 - 14 =I
10 × 12 - 16 =H
11 × 11 - 1 =D
3 + 3 × 3 =F
10 + 5 × 6 =E
12 × 10 - 23 =W
44 + 8 × 9 =R
15 + 3 × 2 =A
31 + 5 × 9 =N
3 + 2 × 2 =K
5 × 11 - 11 =C
9 × 12 - 16 =O
8 × 3 - 1 =L
92 + 7 × 2 =S
14 + 4 × 8 =G
0/18 letters found
Clue 5
Fractions of a number — the last clue
A shattered tracker on the academy docks left behind a fragmented data log. Restoring a fraction of the corrupted files will reveal the final clue.
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
1/5 of 55 = ?
2/8 of 32 = ?
2/10 of 5 = ?
1/2 of 4 = ?
1/8 of 96 = ?
4/10 of 10 = ?
3/5 of 15 = ?
1/2 of 10 = ?
4/6 of 15 = ?
4/8 of 14 = ?
1/4 of 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain scanned the dark chambers using a sonar visor, then hijacked the automated defense grid using drone hacking.
2.The villain melted the steel vault hinges with a laser torch, then calculated the hidden exit route using map decoding.
3.The villain melted the steel vault hinges with a laser torch, then disabled the local security feed using signal jamming.
4.The villain distracted the perimeter guards with a decoy drone, then calculated the hidden exit route using map decoding.
5.The villain distracted the perimeter guards with a decoy drone, then bypassed the digital locks via vault cracking.
6.The villain glided silently from the rafters with a glider cape, then disabled the local security feed using signal jamming.
7.The villain glided silently from the rafters with a glider cape, then scaled the sheer obsidian wall via stealth climbing.
8.The villain scanned the dark chambers using a sonar visor, then bypassed the digital locks via vault cracking.
9.The villain distracted the perimeter guards with a decoy drone, then disabled the local security feed using signal jamming.
10.The villain melted the steel vault hinges with a laser torch, then hijacked the automated defense grid using drone hacking.
11.The villain melted the steel vault hinges with a laser torch, then bypassed the digital locks via vault cracking.
12.The villain distracted the perimeter guards with a decoy drone, then hijacked the automated defense grid using drone hacking.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Whispering Isle Academy Mystery
Culprit: Tessa Brooks (glider cape · signal jamming · holstered on left · matte black helmet · bright strobe lights)
- Clue 1 (Fractions of a number): "THE VILLAIN DOES NOT USE MAP DECODING"1/4 of 156 = 39 (T) · 2/6 of 42 = 14 (I) · 4/6 of 72 = 48 (E) · 1/6 of 174 = 29 (S) · 1/4 of 72 = 18 (A) · 2/4 of 112 = 56 (N) · 1/3 of 159 = 53 (V) · 3/4 of 28 = 21 (L) · 1/5 of 175 = 35 (H) · 4/10 of 5 = 2 (G) · 4/8 of 118 = 59 (M) · 1/3 of 174 = 58 (U) · 5/8 of 48 = 30 (O) · 2/6 of 36 = 12 (P) · 5/10 of 74 = 37 (C) · 2/4 of 6 = 3 (D)
- Clue 2 (Integers): "THE SENSOR DETECTED GEAR ON THE LEFT"26 - (-4) = 30 (T) · (-9) + 37 = 28 (O) · 17 - (-12) = 29 (S) · 5 - (-12) = 17 (A) · (-9) + 22 = 13 (D) · 2 - (-9) = 11 (N) · (-15) + 24 = 9 (F) · (-6) + 12 = 6 (H) · (-6) + 10 = 4 (L) · (-13) + 16 = 3 (E) · 19 - (-4) = 23 (R) · (-15) + 22 = 7 (G) · (-8) + 10 = 2 (C)
- Clue 3 (Percentages): "THE SUSPECT BLINDED BY BRIGHT STROBES"20% of 265 = 53 (T) · 50% of 82 = 41 (P) · 40% of 145 = 58 (E) · 25% of 172 = 43 (D) · 25% of 220 = 55 (H) · 20% of 170 = 34 (O) · 5% of 800 = 40 (B) · 50% of 64 = 32 (G) · 10% of 80 = 8 (I) · 5% of 380 = 19 (N) · 10% of 230 = 23 (C) · 10% of 40 = 4 (L) · 10% of 570 = 57 (R) · 50% of 102 = 51 (S) · 10% of 270 = 27 (Y) · 20% of 70 = 14 (U)
- Clue 4 (Order of operations): "BLACK PAINT WAS SCRAPED OFF THE GRATE"54 + 4 × 3 = 66 (B) · 87 + 4 × 7 = 115 (P) · 31 + 8 × 9 = 103 (T) · 3 × 9 - 14 = 13 (I) · 10 × 12 - 16 = 104 (H) · 11 × 11 - 1 = 120 (D) · 3 + 3 × 3 = 12 (F) · 10 + 5 × 6 = 40 (E) · 12 × 10 - 23 = 97 (W) · 44 + 8 × 9 = 116 (R) · 15 + 3 × 2 = 21 (A) · 31 + 5 × 9 = 76 (N) · 3 + 2 × 2 = 7 (K) · 5 × 11 - 11 = 44 (C) · 9 × 12 - 16 = 92 (O) · 8 × 3 - 1 = 23 (L) · 92 + 7 × 2 = 106 (S) · 14 + 4 × 8 = 46 (G)
- Clue 5 (Fractions of a number): surviving statement (box 6) → Tessa Brooks1/5 of 55 = 11 · 2/8 of 32 = 8 · 2/10 of 5 = 1 · 1/2 of 4 = 2 · 1/8 of 96 = 12 · 4/10 of 10 = 4 · 3/5 of 15 = 9 · 1/2 of 10 = 5 · 4/6 of 15 = 10 · 4/8 of 14 = 7 · 1/4 of 12 = 3
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Fractions of a number, Integers, Percentages, Order of operations
- Reading level
- grades 7-9
- Theme
- The Whispering Isle Academy Mystery — set in A high-tech training island for elite teenage explorers
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects