🤖 RobotsGrade 5Reading: grades 5-6Fractions of a numberOrder of operationsMultiplicationRoundingDivision
The Mystery of the Missing Cyber-Core
A high-powered cyber-core was stolen from the central assembly line at Gearopolis. The factory guards witnessed a rogue bot breach the vault, but the intruder slipped into the maintenance bays before anyone could identify them. Solve the clues to expose the culprit!
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 | Secondary Module | Sensor Position | Wiring Material | Countermeasure |
|---|---|---|---|---|---|
| Hedy Lamarr | Plasma Shield | Hover Drive | Right Antenna Tilted | Chrome Wires | Oil Slick |
| Dorothy Vaughan | Rocket Boost | Overclock Speed | Right Antenna Tilted | Silver Fiber | Oil Slick |
| Gordon Moore | Sonic Blast | Thermal Camo | Left Antenna Tilted | Chrome Wires | Oil Slick |
| Nikola Tesla | Rocket Boost | Nanite Repair | Left Antenna Tilted | Silver Fiber | Oil Slick |
| George Devol | Laser Welding | Thermal Camo | Left Antenna Tilted | Chrome Wires | Magnet Field |
| Claude Shannon | Plasma Shield | Giga Shield | Right Antenna Tilted | Silver Fiber | Magnet Field |
| Grace Hopper | Magnetic Grip | Hover Drive | Left Antenna Tilted | Chrome Wires | Rust Spray |
| Anita Borg | Rocket Boost | Nanite Repair | Left Antenna Tilted | Chrome Wires | Oil Slick |
| Karel Capek | Sonic Blast | Hover Drive | Right Antenna Tilted | Chrome Wires | Oil Slick |
| Cynthia Breazeal | Rocket Boost | Thermal Camo | Right Antenna Tilted | Silver Fiber | Rust Spray |
| Alan Turing | Magnetic Grip | Nanite Repair | Left Antenna Tilted | Chrome Wires | Oil Slick |
| Rodney Brooks | Sonic Blast | Hover Drive | Right Antenna Tilted | Silver Fiber | Rust Spray |
| Marc Raibert | Plasma Shield | Overclock Speed | Left Antenna Tilted | Chrome Wires | Oil Slick |
| Katharine Johnson | Laser Welding | Giga Shield | Right Antenna Tilted | Copper Coils | Magnet Field |
| Isaac Asimov | Rocket Boost | Giga Shield | Right Antenna Tilted | Chrome Wires | Oil Slick |
| Margaret Hamilton | Laser Welding | Nanite Repair | Left Antenna Tilted | Copper Coils | Oil Slick |
| Joseph Engelberger | Rocket Boost | Thermal Camo | Left Antenna Tilted | Chrome Wires | Rust Spray |
| Ayanna Howard | Plasma Shield | Giga Shield | Left Antenna Tilted | Chrome Wires | Oil Slick |
| Norbert Wiener | Magnetic Grip | Nanite Repair | Left Antenna Tilted | Copper Coils | Rust Spray |
| Ada Lovelace | Sonic Blast | Giga Shield | Left Antenna Tilted | Silver Fiber | Oil Slick |
| Radia Perlman | Rocket Boost | Overclock Speed | Right Antenna Tilted | Chrome Wires | Oil Slick |
Clue 1
Fractions of a number
The main vault computer logs only a fraction of the energy core readings from the central grid.
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
25
37
27
9
36
18
3
27
35
36
T
25
23
36
27
16
20
36
T
25
3
16
27
18
2
18
17
16
37
2
27
7
23
1/8 of 200 =T
3/10 of 90 =E
3/6 of 74 =H
1/5 of 175 =B
5/6 of 24 =N
2/8 of 68 =A
2/10 of 35 =L
3/8 of 24 =R
4/8 of 46 =D
3/10 of 60 =G
9/10 of 40 =O
3/6 of 32 =S
2/4 of 4 =I
1/8 of 24 =U
0/14 letters found
Clue 2
Order of operations
To unlock the encrypted server file, you must solve a multi step security sequence.
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
8
37
12
14
35
64
64
64
49
W
8
10
35
54
12
49
14
12
35
14
14
49
12
37
10
12
35
34
66
14
17
66
12
3 × 9 - 19 =W
5 × 11 - 6 =A
11 × 7 - 13 =S
6 × 9 - 17 =I
30 + 2 × 2 =D
15 + 4 × 5 =E
6 + 3 × 2 =T
2 + 4 × 2 =L
8 × 11 - 22 =O
8 + 3 × 2 =N
30 + 3 × 8 =F
2 × 11 - 5 =B
0/12 letters found
Clue 3
Multiplication facts (1-12)
Scanning the storage bay shows stacks of robot battery packs arranged in equal rows.
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
2
1
121
120
110
55
88
33
7
121
42
33
121
33
T
2
1
121
25
132
7
7
18
144
T
2
1
132
144
81
56
81
144
49
30
2 × 1 =T
10 × 11 =U
3 × 6 =W
10 × 3 =K
7 × 1 =F
3 × 11 =D
11 × 5 =A
7 × 8 =S
11 × 11 =E
7 × 7 =C
5 × 5 =M
12 × 12 =I
11 × 8 =R
12 × 10 =G
9 × 9 =L
11 × 12 =O
1 × 1 =H
6 × 7 =N
0/18 letters found
Clue 4
Rounding
The automated diagnostic scanner only displays rounded values on its screen.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
D
200
2900
7000
2900
70
7000
170
2300
2900
30
500
1700
9000
D
200
70
130
50
500
4300
2900
230
170
50
2900
700
5000
7000
700
70
2900
9000
2900
Round 153 to the nearest hundredD
Round 8,673 to the nearest thousandN
Round 167 to the nearest tenI
Round 4,262 to the nearest hundredM
Round 128 to the nearest tenH
Round 29 to the nearest tenF
Round 6,901 to the nearest thousandT
Round 69 to the nearest tenC
Round 536 to the nearest hundredO
Round 2,295 to the nearest hundredV
Round 2,939 to the nearest hundredE
Round 53 to the nearest tenR
Round 4,518 to the nearest thousandA
Round 1,722 to the nearest hundredU
Round 226 to the nearest tenW
Round 742 to the nearest hundredS
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
Distributing the spare circuits equally among all five repair bays reveals the final system key.
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
12 ÷ 3 = ?
20 ÷ 2 = ?
132 ÷ 11 = ?
81 ÷ 9 = ?
54 ÷ 9 = ?
5 ÷ 1 = ?
14 ÷ 7 = ?
56 ÷ 8 = ?
5 ÷ 5 = ?
56 ÷ 7 = ?
11 ÷ 1 = ?
Step 2 — cross out the sentence with each answer
1.The villain welded open the security gate, then deployed a giga shield.
2.The villain boosted over the perimeter wall, then turned on thermal camo.
3.The villain boosted over the perimeter wall, then triggered nanite repair.
4.The villain shattered the alarm glass with sound, then turned on thermal camo.
5.The villain welded open the security gate, then turned on thermal camo.
6.The villain grabbed the steel vault handle, then engaged hover drive.
7.The villain shielded the getaway route, then deployed a giga shield.
8.The villain grabbed the steel vault handle, then deployed a giga shield.
9.The villain boosted over the perimeter wall, then deployed a giga shield.
10.The villain grabbed the steel vault handle, then triggered nanite repair.
11.The villain shielded the getaway route, then turned on thermal camo.
12.The villain shielded the getaway route, then activated overclock speed.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Missing Cyber-Core
Culprit: Anita Borg (Rocket Boost · Nanite Repair · Left Antenna Tilted · Chrome Wires · Oil Slick)
- Clue 1 (Fractions of a number): "THE ROGUE BOT DOES NOT USE GIGA SHIELD"1/8 of 200 = 25 (T) · 3/10 of 90 = 27 (E) · 3/6 of 74 = 37 (H) · 1/5 of 175 = 35 (B) · 5/6 of 24 = 20 (N) · 2/8 of 68 = 17 (A) · 2/10 of 35 = 7 (L) · 3/8 of 24 = 9 (R) · 4/8 of 46 = 23 (D) · 3/10 of 60 = 18 (G) · 9/10 of 40 = 36 (O) · 3/6 of 32 = 16 (S) · 2/4 of 4 = 2 (I) · 1/8 of 24 = 3 (U)
- Clue 2 (Order of operations): "WITNESS SAW LEFT ANTENNA TILTED ON BOT"3 × 9 - 19 = 8 (W) · 5 × 11 - 6 = 49 (A) · 11 × 7 - 13 = 64 (S) · 6 × 9 - 17 = 37 (I) · 30 + 2 × 2 = 34 (D) · 15 + 4 × 5 = 35 (E) · 6 + 3 × 2 = 12 (T) · 2 + 4 × 2 = 10 (L) · 8 × 11 - 22 = 66 (O) · 8 + 3 × 2 = 14 (N) · 30 + 3 × 8 = 54 (F) · 2 × 11 - 5 = 17 (B)
- Clue 3 (Multiplication facts (1-12)): "THE GUARD FENDED THEM OFF WITH OIL SLICK"2 × 1 = 2 (T) · 10 × 11 = 110 (U) · 3 × 6 = 18 (W) · 10 × 3 = 30 (K) · 7 × 1 = 7 (F) · 3 × 11 = 33 (D) · 11 × 5 = 55 (A) · 7 × 8 = 56 (S) · 11 × 11 = 121 (E) · 7 × 7 = 49 (C) · 5 × 5 = 25 (M) · 12 × 12 = 144 (I) · 11 × 8 = 88 (R) · 12 × 10 = 120 (G) · 9 × 9 = 81 (L) · 11 × 12 = 132 (O) · 1 × 1 = 1 (H) · 6 × 7 = 42 (N)
- Clue 4 (Rounding): "DETECTIVE FOUND CHROME WIRES AT SCENE"Round 153 to the nearest hundred = 200 (D) · Round 8,673 to the nearest thousand = 9000 (N) · Round 167 to the nearest ten = 170 (I) · Round 4,262 to the nearest hundred = 4300 (M) · Round 128 to the nearest ten = 130 (H) · Round 29 to the nearest ten = 30 (F) · Round 6,901 to the nearest thousand = 7000 (T) · Round 69 to the nearest ten = 70 (C) · Round 536 to the nearest hundred = 500 (O) · Round 2,295 to the nearest hundred = 2300 (V) · Round 2,939 to the nearest hundred = 2900 (E) · Round 53 to the nearest ten = 50 (R) · Round 4,518 to the nearest thousand = 5000 (A) · Round 1,722 to the nearest hundred = 1700 (U) · Round 226 to the nearest ten = 230 (W) · Round 742 to the nearest hundred = 700 (S)
- Clue 5 (Division facts (1-12)): surviving statement (box 3) → Anita Borg12 ÷ 3 = 4 · 20 ÷ 2 = 10 · 132 ÷ 11 = 12 · 81 ÷ 9 = 9 · 54 ÷ 9 = 6 · 5 ÷ 1 = 5 · 14 ÷ 7 = 2 · 56 ÷ 8 = 7 · 5 ÷ 5 = 1 · 56 ÷ 7 = 8 · 11 ÷ 1 = 11
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Fractions of a number, Order of operations, Multiplication, Rounding, Division
- Reading level
- grades 5-6
- Theme
- The Mystery of the Missing Cyber-Core — set in Gearopolis Robot Factory
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects