🤖 RobotsGrade 4Reading: grades 3-4MultiplicationRoundingAdditionSubtractionDivision
The Mystery of the Rogue Bot
A rogue bot snuck into the main lab during the Gearspark Expo and scrambled the master blueprints! Solve the math clues to uncover which bot went rogue before the final showcase.
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 | Gadget | Status Light | Wire Color | System Glitch |
|---|---|---|---|---|---|
| Dean Kamen | Laser Cutter | Rocket Boots | Steady Blue Light | Bright Silver Wires | Bright Flash |
| Joseph Engelberger | Sonic Drill | Rocket Boots | Blinking Red Light | Copper Red Wires | Water Splash |
| Rodney Brooks | Magnet Arm | EMP Blaster | Steady Blue Light | Copper Red Wires | Bright Flash |
| Nikola Tesla | Turbo Jetpack | Spark Shield | Steady Blue Light | Neon Yellow Wires | Bright Flash |
| Isaac Asimov | Magnet Arm | EMP Blaster | Blinking Red Light | Copper Red Wires | Magnet Trap |
| Ayanna Howard | Laser Cutter | Oil Cannon | Steady Blue Light | Bright Silver Wires | Bright Flash |
| Marc Raibert | Plasma Welder | Smoke Screen | Blinking Red Light | Bright Silver Wires | Water Splash |
| Katherine Johnson | Turbo Jetpack | Oil Cannon | Steady Blue Light | Copper Red Wires | Bright Flash |
| Hedy Lamarr | Turbo Jetpack | Oil Cannon | Blinking Red Light | Bright Silver Wires | Bright Flash |
| Norbert Wiener | Plasma Welder | Smoke Screen | Steady Blue Light | Copper Red Wires | Bright Flash |
| Takeo Kanade | Magnet Arm | EMP Blaster | Blinking Red Light | Copper Red Wires | Water Splash |
| Alan Turing | Magnet Arm | Spark Shield | Blinking Red Light | Copper Red Wires | Water Splash |
| Sebastian Thrun | Magnet Arm | Rocket Boots | Blinking Red Light | Copper Red Wires | Bright Flash |
| George Devol | Plasma Welder | Spark Shield | Steady Blue Light | Bright Silver Wires | Magnet Trap |
| Charles Babbage | Magnet Arm | Oil Cannon | Blinking Red Light | Neon Yellow Wires | Water Splash |
| Cynthia Breazeal | Magnet Arm | Oil Cannon | Blinking Red Light | Bright Silver Wires | Magnet Trap |
| Radia Perlman | Sonic Drill | EMP Blaster | Steady Blue Light | Bright Silver Wires | Water Splash |
| Dorothy Vaughan | Laser Cutter | Rocket Boots | Steady Blue Light | Copper Red Wires | Bright Flash |
| Ada Lovelace | Turbo Jetpack | Rocket Boots | Steady Blue Light | Copper Red Wires | Bright Flash |
| Fei-Fei Li | Magnet Arm | EMP Blaster | Steady Blue Light | Neon Yellow Wires | Magnet Trap |
| Margaret Hamilton | Plasma Welder | Spark Shield | Steady Blue Light | Copper Red Wires | Water Splash |
Clue 1
Multiplication facts (1-12)
Detective Lin finds rows of charging docks in the workshop. Multiplying the rows by the docks per row unlocks the first clue.
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
54
120
81
8
45
63
63
10
45
25
72
15
81
21
25
15
T
54
121
21
81
10
25
15
45
63
36
10
25
25
15
25
6 × 9 =T
5 × 9 =I
9 × 7 =L
2 × 4 =V
12 × 10 =H
5 × 3 =O
9 × 9 =E
9 × 4 =C
6 × 12 =D
10 × 1 =A
11 × 11 =U
5 × 5 =N
7 × 3 =S
0/13 letters found
Clue 2
Rounding
The main scanner readout rounds total energy usage to the nearest hundred. The rounded number reveals the second clue.
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
300
20
170
110
170
2000
1700
900
9000
T
300
4300
2000
30
50
170
900
30
110
1300
5000
T
300
T
300
170
290
30
2900
3700
1700
170
3700
9000
430
20
T
300
Round 327 to the nearest hundredT
Round 1,703 to the nearest hundredU
Round 4,975 to the nearest thousandO
Round 53 to the nearest tenM
Round 29 to the nearest tenA
Round 2,886 to the nearest hundredB
Round 2,313 to the nearest thousandC
Round 852 to the nearest hundredR
Round 1,277 to the nearest hundredP
Round 3,668 to the nearest hundredL
Round 427 to the nearest tenG
Round 4,257 to the nearest hundredY
Round 172 to the nearest tenE
Round 293 to the nearest tenD
Round 21 to the nearest tenH
Round 9,405 to the nearest thousandI
Round 107 to the nearest tenS
0/17 letters found
Clue 3
Addition
Lin counts up all the extra gear gears gathered from the workbench. Adding the piles together unlocks the third clue.
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
6469
3993
6378
A
6469
5624
9416
6425
3993
7080
8831
7709
7852
9416
7419
6378
7709
7852
9416
7419
7317
6425
4347
3993
5104
5624
4890
5500
7419
9416
4890
7080
6425
7419
3843 + 2626 =A
2365 + 1982 =N
2569 + 4511 =B
2661 + 2229 =E
1770 + 3730 =D
2373 + 1620 =F
3021 + 6395 =H
3276 + 3149 =O
4216 + 3636 =G
3626 + 3691 =C
2821 + 4888 =I
3333 + 2291 =S
3641 + 2737 =L
2447 + 2657 =U
3636 + 5195 =R
2538 + 4881 =T
0/16 letters found
Clue 4
Subtraction
Lin compares battery charge before and after the incident. Subtracting the numbers shows the exact secret value for clue four.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
C
7602
2047
7582
7582
4654
3039
3039
4654
4616
6597
7343
3039
4654
7577
6597
4654
3039
4654
8648
4654
7652
3598
3177
3598
3598
2270
4654
7577
C
7602
4654
3324
4654
11825 - 4223 =C
8895 - 1318 =S
8313 - 3697 =D
11801 - 4149 =F
4882 - 1284 =T
9328 - 1746 =P
8126 - 783 =I
11893 - 3245 =L
8541 - 3887 =E
7368 - 4191 =A
4651 - 2381 =H
4536 - 1212 =N
5813 - 3766 =O
3240 - 201 =R
11110 - 4513 =W
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
Lin splits the total diagnostic microchips equally among the security stations. Dividing the stack unlocks 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
48 ÷ 12 = ?
33 ÷ 3 = ?
24 ÷ 8 = ?
1 ÷ 1 = ?
35 ÷ 5 = ?
40 ÷ 5 = ?
48 ÷ 8 = ?
27 ÷ 3 = ?
48 ÷ 4 = ?
120 ÷ 12 = ?
60 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain sparks a plasma welder, then blasts an emp wave.
2.The villain swings a magnet arm, then blasts an emp wave.
3.The villain uses a laser cutter, then activates rocket boots.
4.The villain fires a turbo jetpack, then activates rocket boots.
5.The villain swings a magnet arm, then activates rocket boots.
6.The villain sparks a plasma welder, then raises a spark shield.
7.The villain uses a laser cutter, then launches a smoke screen.
8.The villain swings a magnet arm, then deploys an oil cannon.
9.The villain uses a laser cutter, then deploys an oil cannon.
10.The villain revs a sonic drill, then blasts an emp wave.
11.The villain sparks a plasma welder, then launches a smoke screen.
12.The villain revs a sonic drill, then raises a spark shield.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Rogue Bot
Culprit: Rodney Brooks (Magnet Arm · EMP Blaster · Steady Blue Light · Copper Red Wires · Bright Flash)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT USE AN OIL CANNON"6 × 9 = 54 (T) · 5 × 9 = 45 (I) · 9 × 7 = 63 (L) · 2 × 4 = 8 (V) · 12 × 10 = 120 (H) · 5 × 3 = 15 (O) · 9 × 9 = 81 (E) · 9 × 4 = 36 (C) · 6 × 12 = 72 (D) · 10 × 1 = 10 (A) · 11 × 11 = 121 (U) · 5 × 5 = 25 (N) · 7 × 3 = 21 (S)
- Clue 2 (Rounding): "THE SECURITY CAMERA SPOTTED A BLUE LIGHT"Round 327 to the nearest hundred = 300 (T) · Round 1,703 to the nearest hundred = 1700 (U) · Round 4,975 to the nearest thousand = 5000 (O) · Round 53 to the nearest ten = 50 (M) · Round 29 to the nearest ten = 30 (A) · Round 2,886 to the nearest hundred = 2900 (B) · Round 2,313 to the nearest thousand = 2000 (C) · Round 852 to the nearest hundred = 900 (R) · Round 1,277 to the nearest hundred = 1300 (P) · Round 3,668 to the nearest hundred = 3700 (L) · Round 427 to the nearest ten = 430 (G) · Round 4,257 to the nearest hundred = 4300 (Y) · Round 172 to the nearest ten = 170 (E) · Round 293 to the nearest ten = 290 (D) · Round 21 to the nearest ten = 20 (H) · Round 9,405 to the nearest thousand = 9000 (I) · Round 107 to the nearest ten = 110 (S)
- Clue 3 (Addition): "A FLASH OF BRIGHT LIGHT CONFUSED THE BOT"3843 + 2626 = 6469 (A) · 2365 + 1982 = 4347 (N) · 2569 + 4511 = 7080 (B) · 2661 + 2229 = 4890 (E) · 1770 + 3730 = 5500 (D) · 2373 + 1620 = 3993 (F) · 3021 + 6395 = 9416 (H) · 3276 + 3149 = 6425 (O) · 4216 + 3636 = 7852 (G) · 3626 + 3691 = 7317 (C) · 2821 + 4888 = 7709 (I) · 3333 + 2291 = 5624 (S) · 3641 + 2737 = 6378 (L) · 2447 + 2657 = 5104 (U) · 3636 + 5195 = 8831 (R) · 2538 + 4881 = 7419 (T)
- Clue 4 (Subtraction): "COPPER RED WIRES WERE LEFT AT THE SCENE"11825 - 4223 = 7602 (C) · 8895 - 1318 = 7577 (S) · 8313 - 3697 = 4616 (D) · 11801 - 4149 = 7652 (F) · 4882 - 1284 = 3598 (T) · 9328 - 1746 = 7582 (P) · 8126 - 783 = 7343 (I) · 11893 - 3245 = 8648 (L) · 8541 - 3887 = 4654 (E) · 7368 - 4191 = 3177 (A) · 4651 - 2381 = 2270 (H) · 4536 - 1212 = 3324 (N) · 5813 - 3766 = 2047 (O) · 3240 - 201 = 3039 (R) · 11110 - 4513 = 6597 (W)
- Clue 5 (Division facts (1-12)): surviving statement (box 2) → Rodney Brooks48 ÷ 12 = 4 · 33 ÷ 3 = 11 · 24 ÷ 8 = 3 · 1 ÷ 1 = 1 · 35 ÷ 5 = 7 · 40 ÷ 5 = 8 · 48 ÷ 8 = 6 · 27 ÷ 3 = 9 · 48 ÷ 4 = 12 · 120 ÷ 12 = 10 · 60 ÷ 12 = 5
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Multiplication, Rounding, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Rogue Bot — set in Gearspark Robotics Expo
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects