🤖 RobotsGrade 9Reading: grades 7-9RoundingAdditionSubtractionMultiplicationDivision

The Great Spark Core Heist

A high-security Spark Core has been stolen from the central laboratory. A rogue automaton bypassed the biometric security grid, leaving behind scorched circuits and scrambled log files. Detective, you must analyze the corrupted data to identify which robot is responsible before they drain the core's power.

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 Subsystem	Optical Laser Color	Chassis Cabling	System Vulnerability
Unit Galileo	Hydraulic Press	Shield Generator	Bright Amber Laser	Shielded Gold Wires	Saline Splash
Unit Clarke	Laser Welder	Jet Thrusters	Neon Green Laser	Shielded Gold Wires	Static Discharge
Unit Gibson	Hydraulic Press	Sonar Array	Neon Green Laser	Insulated Silver Wires	Static Discharge
Unit Kepler	Laser Welder	Jet Thrusters	Neon Green Laser	Braided Copper Wires	Static Discharge
Unit Bradbury	Hydraulic Press	Jet Thrusters	Bright Amber Laser	Braided Copper Wires	Saline Splash
Unit Dick	Pneumatic Claw	Thermal Camera	Bright Amber Laser	Braided Copper Wires	Saline Splash
Unit Copernicus	Plasma Cutter	Shield Generator	Neon Green Laser	Braided Copper Wires	Neodymium Magnet
Unit Tesla	Hydraulic Press	Thermal Camera	Bright Amber Laser	Insulated Silver Wires	Static Discharge
Unit Babbage	Hydraulic Press	Shield Generator	Bright Amber Laser	Shielded Gold Wires	Static Discharge
Unit Lem	Hydraulic Press	Thermal Camera	Bright Amber Laser	Braided Copper Wires	Saline Splash
Unit Newton	Plasma Cutter	Thermal Camera	Neon Green Laser	Insulated Silver Wires	Saline Splash
Unit Asimov	Pneumatic Claw	Jet Thrusters	Neon Green Laser	Shielded Gold Wires	Static Discharge
Unit Pascal	Plasma Cutter	Thermal Camera	Neon Green Laser	Braided Copper Wires	Saline Splash
Unit Turing	Magnetic Gripper	Shield Generator	Neon Green Laser	Braided Copper Wires	Saline Splash
Unit Curie	Plasma Cutter	Shield Generator	Bright Amber Laser	Shielded Gold Wires	Static Discharge
Unit Orwell	Magnetic Gripper	Cloaking Field	Neon Green Laser	Insulated Silver Wires	Static Discharge
Unit Lovelace	Laser Welder	Cloaking Field	Neon Green Laser	Shielded Gold Wires	Static Discharge
Unit Hopper	Hydraulic Press	Cloaking Field	Bright Amber Laser	Braided Copper Wires	Saline Splash
Unit Hubble	Hydraulic Press	Shield Generator	Bright Amber Laser	Braided Copper Wires	Static Discharge
Unit Shelley	Pneumatic Claw	Jet Thrusters	Bright Amber Laser	Shielded Gold Wires	Saline Splash
Unit Hawking	Pneumatic Claw	Sonar Array	Bright Amber Laser	Braided Copper Wires	Saline Splash

Clue 1

Rounding

We found a bootleg diagnostic terminal, but its low-resolution screen rounds the current voltage 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.

30000

310000

700

310

140000

50000

140000

4700

310000

3000

4700

470

2800000

50000

470

500

140000

4700

280000

140000

700

50000

1400

Round 29,305 to the nearest ten thousandT

Round 281,700 to the nearest ten thousandG

Round 467 to the nearest tenO

Round 2,832,203 to the nearest hundred thousandC

Round 51,354 to the nearest ten thousandL

Round 4,692 to the nearest hundredN

Round 142,732 to the nearest ten thousandI

Round 306 to the nearest tenV

Round 24 to the nearest tenA

Round 543 to the nearest hundredK

Round 307,635 to the nearest ten thousandH

Round 2,912 to the nearest thousandS

Round 693 to the nearest hundredE

Round 50 to the nearest tenF

Round 1,387 to the nearest hundredD

0/15 letters found

Clue 2

Addition

Tallying the total energy spikes across the power grid lets us calculate the unit weight of the rogue bot.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

5185

4844

3883

3327

8021

8767

8594

2268

4742

6459

3883

3327

5185

4844

3327

4982

5185

6459

4742

3327

3468

5185

4844

3327

8021

5185

3005 + 2180 =A

3327 + 3132 =T

3279 + 1703 =D

3099 + 4922 =R

2195 + 2547 =H

1837 + 1631 =C

2635 + 1248 =B

4327 + 4440 =L

2010 + 2834 =M

832 + 1436 =G

3565 + 5029 =I

2028 + 1299 =E

0/12 letters found

Clue 3

Subtraction

Subtracting the leftover oil reserves from the tank's original capacity reveals the exact fuel efficiency of the thief.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

4298

8874

2199

1302

5299

8874

1302

6475

5589

5299

3895

6409

6475

4298

6682

3517

1302

8451

6475

7770

3895

5589

7770

3517

3895

1302

4298

6417 - 2119 =S

8731 - 2322 =P

10341 - 1890 =H

2197 - 895 =T

4989 - 2790 =L

12446 - 3572 =A

11407 - 3637 =C

4244 - 727 =U

8204 - 1522 =O

8786 - 3197 =R

4477 - 582 =I

8126 - 1651 =E

9844 - 4545 =W

0/13 letters found

Clue 4

Multiplication facts (1-12)

The server room is arranged in a massive grid, and multiplying the row count by the active servers pinpoints the suspect's frequency.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

132

144

12 × 11 =C

5 × 5 =A

7 × 6 =P

7 × 10 =H

7 × 5 =O

3 × 9 =I

5 × 9 =F

5 × 11 =M

12 × 12 =T

6 × 8 =S

4 × 7 =N

12 × 8 =E

11 × 9 =L

7 × 7 =R

0/14 letters found

Clue 5

Division facts (1-12) — the last clue

By dividing the stolen memory drive's sectors equally among our decryption nodes, we isolate the final security code.

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

60 ÷ 6 = ?

144 ÷ 12 = ?

30 ÷ 6 = ?

7 ÷ 1 = ?

99 ÷ 11 = ?

33 ÷ 3 = ?

4 ÷ 1 = ?

80 ÷ 10 = ?

20 ÷ 10 = ?

66 ÷ 11 = ?

5 ÷ 5 = ?

Step 2 — cross out the sentence with each answer

1.The villain sliced open the vault door with a laser welder, then blasted through the roof vents with jet thrusters.

2.The villain melted the lock using a plasma cutter, then pinged the getaway route using a sonar array.

3.The villain ripped the console apart with a pneumatic claw, then pinged the getaway route using a sonar array.

4.The villain wrenched the safe free using a magnetic gripper, then faded into the shadows using a cloaking field.

5.The villain crushed the steel gate with a hydraulic press, then located the guard patrols with a thermal camera.

6.The villain crushed the steel gate with a hydraulic press, then blocked incoming security bolts with a shield generator.

7.The villain ripped the console apart with a pneumatic claw, then blocked incoming security bolts with a shield generator.

8.The villain sliced open the vault door with a laser welder, then located the guard patrols with a thermal camera.

9.The villain sliced open the vault door with a laser welder, then faded into the shadows using a cloaking field.

10.The villain crushed the steel gate with a hydraulic press, then blasted through the roof vents with jet thrusters.

11.The villain crushed the steel gate with a hydraulic press, then pinged the getaway route using a sonar array.

12.The villain ripped the console apart with a pneumatic claw, then located the guard patrols with a thermal camera.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Great Spark Core Heist

Culprit: Unit Hawking (Pneumatic Claw · Sonar Array · Bright Amber Laser · Braided Copper Wires · Saline Splash)

Clue 1 (Rounding): "THE VILLAIN HAS NO CLOAKING FIELD"
Round 29,305 to the nearest ten thousand = 30000 (T) · Round 281,700 to the nearest ten thousand = 280000 (G) · Round 467 to the nearest ten = 470 (O) · Round 2,832,203 to the nearest hundred thousand = 2800000 (C) · Round 51,354 to the nearest ten thousand = 50000 (L) · Round 4,692 to the nearest hundred = 4700 (N) · Round 142,732 to the nearest ten thousand = 140000 (I) · Round 306 to the nearest ten = 310 (V) · Round 24 to the nearest ten = 20 (A) · Round 543 to the nearest hundred = 500 (K) · Round 307,635 to the nearest ten thousand = 310000 (H) · Round 2,912 to the nearest thousand = 3000 (S) · Round 693 to the nearest hundred = 700 (E) · Round 50 to the nearest ten = 50 (F) · Round 1,387 to the nearest hundred = 1400 (D)
Clue 2 (Addition): "AMBER LIGHT BEAMED AT THE CAMERA"
3005 + 2180 = 5185 (A) · 3327 + 3132 = 6459 (T) · 3279 + 1703 = 4982 (D) · 3099 + 4922 = 8021 (R) · 2195 + 2547 = 4742 (H) · 1837 + 1631 = 3468 (C) · 2635 + 1248 = 3883 (B) · 4327 + 4440 = 8767 (L) · 2010 + 2834 = 4844 (M) · 832 + 1436 = 2268 (G) · 3565 + 5029 = 8594 (I) · 2028 + 1299 = 3327 (E)
Clue 3 (Subtraction): "SALT WATER WIPES OUT THE CIRCUITS"
6417 - 2119 = 4298 (S) · 8731 - 2322 = 6409 (P) · 10341 - 1890 = 8451 (H) · 2197 - 895 = 1302 (T) · 4989 - 2790 = 2199 (L) · 12446 - 3572 = 8874 (A) · 11407 - 3637 = 7770 (C) · 4244 - 727 = 3517 (U) · 8204 - 1522 = 6682 (O) · 8786 - 3197 = 5589 (R) · 4477 - 582 = 3895 (I) · 8126 - 1651 = 6475 (E) · 9844 - 4545 = 5299 (W)
Clue 4 (Multiplication facts (1-12)): "COPPER FILAMENTS LEFT AT THE SEAM"
12 × 11 = 132 (C) · 5 × 5 = 25 (A) · 7 × 6 = 42 (P) · 7 × 10 = 70 (H) · 7 × 5 = 35 (O) · 3 × 9 = 27 (I) · 5 × 9 = 45 (F) · 5 × 11 = 55 (M) · 12 × 12 = 144 (T) · 6 × 8 = 48 (S) · 4 × 7 = 28 (N) · 12 × 8 = 96 (E) · 11 × 9 = 99 (L) · 7 × 7 = 49 (R)
Clue 5 (Division facts (1-12)): surviving statement (box 3) → Unit Hawking
60 ÷ 6 = 10 · 144 ÷ 12 = 12 · 30 ÷ 6 = 5 · 7 ÷ 1 = 7 · 99 ÷ 11 = 9 · 33 ÷ 3 = 11 · 4 ÷ 1 = 4 · 80 ÷ 10 = 8 · 20 ÷ 10 = 2 · 66 ÷ 11 = 6 · 5 ÷ 5 = 1

About this mystery

Grade level: Grade 9 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 7-9
Theme: The Great Spark Core Heist — set in the high-security Robo-Assembly Yards of Neo-Detroit
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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