🤖 RobotsGrade 4Reading: grades 3-4AdditionSubtractionPlace valueRoundingMissing addends

The Great Spark City Bot Hunt

A rogue robot has escaped from the Spark City Lab! It took the Golden Microchip. We need you to decode the clues and find the rogue bot before its battery drains. Tech-Kid Cody is ready to help you track it down!

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	Backup Gear	Spark Side	Loose Wire	System Vulnerability
Data	Sonic Horn	Night Vision	Left Side Spark	Green Wire	Magnet
Eve	Plasma Cutter	Magnetic Soles	Left Side Spark	Green Wire	Rust Spray
Gort	Laser Welder	Smoke Screen	Left Side Spark	Green Wire	Water
Robby	Claw Grabber	Turbo Thrusters	Right Side Spark	Green Wire	Water
Bolts	Claw Grabber	Magnetic Soles	Left Side Spark	Green Wire	Water
Rusty	Claw Grabber	Night Vision	Left Side Spark	Blue Wire	Water
Gizmo	Claw Grabber	Magnetic Soles	Right Side Spark	Blue Wire	Rust Spray
Optimus	Sonic Horn	Bubble Shield	Right Side Spark	Green Wire	Rust Spray
Megatron	Laser Welder	Bubble Shield	Left Side Spark	Green Wire	Magnet
Sparky	Sonic Horn	Smoke Screen	Left Side Spark	Green Wire	Rust Spray
Bender	Sonic Horn	Magnetic Soles	Left Side Spark	Red Wire	Rust Spray
Pip	Claw Grabber	Smoke Screen	Left Side Spark	Red Wire	Water
Alita	Laser Welder	Turbo Thrusters	Left Side Spark	Red Wire	Magnet
Baymax	Claw Grabber	Night Vision	Left Side Spark	Green Wire	Magnet
WallE	Super Drill	Night Vision	Right Side Spark	Blue Wire	Rust Spray
Rosie	Plasma Cutter	Magnetic Soles	Left Side Spark	Green Wire	Magnet
Hal	Laser Welder	Smoke Screen	Left Side Spark	Green Wire	Magnet
Astro	Claw Grabber	Smoke Screen	Right Side Spark	Green Wire	Magnet
Rodney	Claw Grabber	Magnetic Soles	Left Side Spark	Blue Wire	Water
Gipsy	Sonic Horn	Bubble Shield	Right Side Spark	Blue Wire	Water
Clank	Laser Welder	Night Vision	Right Side Spark	Blue Wire	Magnet

Clue 1

Addition

Cody needs to add up the spare gears found on two workbenches. Combining them will unlock the first encryption lock.

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

8977

6474

2987

6972

7830

8977

8727

7830

2987

3927

6996

7830

8977

6474

8555

6402

2987

8555

6972

4723

6972

6254

2987

3927

6474

4524

2987

6254

8727

5089 + 3888 =T

3754 + 4973 =D

1238 + 1749 =E

2852 + 3550 =V

1653 + 2274 =S

4092 + 3738 =O

4010 + 2986 =N

2745 + 3729 =H

1573 + 3150 =U

2129 + 4125 =L

4572 + 3983 =A

4725 + 2247 =B

2669 + 1855 =I

0/13 letters found

Clue 2

Subtraction

To find how much fuel the rogue robot used, Cody subtracts the remaining energy from the starting full tank.

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

1053

7597

4910

8792

7923

4148

5954

7923

2434

5769

3929

5954

2810

3066

5769

2671

2810

7462

5776

1053

7597

4910

4148

4910

2671

1053

1295 - 242 =T

6078 - 1168 =E

7154 - 1385 =S

8116 - 2162 =A

8141 - 2365 =M

13056 - 4264 =V

4512 - 1841 =F

8064 - 467 =H

4247 - 1181 =K

7398 - 4588 =R

6793 - 2645 =L

10514 - 3052 =O

10864 - 2941 =I

3959 - 1525 =N

6742 - 2813 =P

0/15 letters found

Clue 3

Place value

The lab safe uses a keypad. Cody must look at the digit in the hundreds place of the serial number to find the override code.

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

9000

900

4000

100

4000

500

400

600

400

200

6000

9000

What is the value of the 6 in 5,868?T

What is the value of the 9 in 9,878?E

What is the value of the 2 in 3,208?G

What is the value of the 5 in 503?F

What is the value of the 6 in 6,805?N

What is the value of the 4 in 9,497?A

What is the value of the 1 in 914?R

What is the value of the 1 in 122?P

What is the value of the 4 in 9,949?O

What is the value of the 5 in 453?H

What is the value of the 9 in 953?B

What is the value of the 4 in 54,609?S

What is the value of the 6 in 5,683?M

0/13 letters found

Clue 4

Rounding

The radar screen only shows rounded estimates of the bot's speed. Cody must round the signal number to the nearest ten to pinpoint the direction.

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

430

7000

110

500

3000

1100

2900

3700

7000

430

5000

3700

7000

Round 429 to the nearest tenW

Round 5,399 to the nearest thousandI

Round 54 to the nearest tenN

Round 2,854 to the nearest hundredG

Round 87 to the nearest tenU

Round 3,027 to the nearest thousandD

Round 3,685 to the nearest hundredR

Round 111 to the nearest tenF

Round 517 to the nearest hundredO

Round 1,077 to the nearest hundredA

Round 6,686 to the nearest thousandE

0/11 letters found

Clue 5

Missing addends — the last clue

The battery charger needs exactly one hundred volts. Cody counts ninety-two volts and must find the missing amount to power up the decoder.

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

23 + ___ = 31

5 + ___ = 11

30 + ___ = 35

4 + ___ = 6

37 + ___ = 47

21 + ___ = 24

24 + ___ = 28

35 + ___ = 42

2 + ___ = 13

34 + ___ = 46

32 + ___ = 33

Step 2 — cross out the sentence with each answer

1.The villain drilled a big tunnel, then zoomed out of the window.

2.The villain blasted a loud alarm, then bounced away in a bubble.

3.The villain snatched the gold chip, then walked up the metal wall.

4.The villain sliced through the wall, then left a thick grey cloud.

5.The villain sliced through the wall, then walked up the metal wall.

6.The villain snatched the gold chip, then raced through the dark.

7.The villain blasted a loud alarm, then walked up the metal wall.

8.The villain blasted a loud alarm, then raced through the dark.

9.The villain melted the vault gate, then left a thick grey cloud.

10.The villain melted the vault gate, then raced through the dark.

11.The villain drilled a big tunnel, then walked up the metal wall.

12.The villain sliced through the wall, then zoomed out of the window.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Great Spark City Bot Hunt

Culprit: Hal (Laser Welder · Smoke Screen · Left Side Spark · Green Wire · Magnet)

Clue 1 (Addition): "THE BOT DOES NOT HAVE A BUBBLE SHIELD"
5089 + 3888 = 8977 (T) · 3754 + 4973 = 8727 (D) · 1238 + 1749 = 2987 (E) · 2852 + 3550 = 6402 (V) · 1653 + 2274 = 3927 (S) · 4092 + 3738 = 7830 (O) · 4010 + 2986 = 6996 (N) · 2745 + 3729 = 6474 (H) · 1573 + 3150 = 4723 (U) · 2129 + 4125 = 6254 (L) · 4572 + 3983 = 8555 (A) · 4725 + 2247 = 6972 (B) · 2669 + 1855 = 4524 (I)
Clue 2 (Subtraction): "THE VILLAIN SPARKS FROM THE LEFT"
1295 - 242 = 1053 (T) · 6078 - 1168 = 4910 (E) · 7154 - 1385 = 5769 (S) · 8116 - 2162 = 5954 (A) · 8141 - 2365 = 5776 (M) · 13056 - 4264 = 8792 (V) · 4512 - 1841 = 2671 (F) · 8064 - 467 = 7597 (H) · 4247 - 1181 = 3066 (K) · 7398 - 4588 = 2810 (R) · 6793 - 2645 = 4148 (L) · 10514 - 3052 = 7462 (O) · 10864 - 2941 = 7923 (I) · 3959 - 1525 = 2434 (N) · 6742 - 2813 = 3929 (P)
Clue 3 (Place value): "THE BOT STOPS FOR A MAGNET"
What is the value of the 6 in 5,868? = 60 (T) · What is the value of the 9 in 9,878? = 9000 (E) · What is the value of the 2 in 3,208? = 200 (G) · What is the value of the 5 in 503? = 500 (F) · What is the value of the 6 in 6,805? = 6000 (N) · What is the value of the 4 in 9,497? = 400 (A) · What is the value of the 1 in 914? = 10 (R) · What is the value of the 1 in 122? = 100 (P) · What is the value of the 4 in 9,949? = 40 (O) · What is the value of the 5 in 453? = 50 (H) · What is the value of the 9 in 953? = 900 (B) · What is the value of the 4 in 54,609? = 4000 (S) · What is the value of the 6 in 5,683? = 600 (M)
Clue 4 (Rounding): "WE FOUND A GREEN WIRE"
Round 429 to the nearest ten = 430 (W) · Round 5,399 to the nearest thousand = 5000 (I) · Round 54 to the nearest ten = 50 (N) · Round 2,854 to the nearest hundred = 2900 (G) · Round 87 to the nearest ten = 90 (U) · Round 3,027 to the nearest thousand = 3000 (D) · Round 3,685 to the nearest hundred = 3700 (R) · Round 111 to the nearest ten = 110 (F) · Round 517 to the nearest hundred = 500 (O) · Round 1,077 to the nearest hundred = 1100 (A) · Round 6,686 to the nearest thousand = 7000 (E)
Clue 5 (Missing addends): surviving statement (box 9) → Hal
23 + ___ = 31 = 8 · 5 + ___ = 11 = 6 · 30 + ___ = 35 = 5 · 4 + ___ = 6 = 2 · 37 + ___ = 47 = 10 · 21 + ___ = 24 = 3 · 24 + ___ = 28 = 4 · 35 + ___ = 42 = 7 · 2 + ___ = 13 = 11 · 34 + ___ = 46 = 12 · 32 + ___ = 33 = 1

About this mystery

Grade level: Grade 4 math
Math topics: Addition, Subtraction, Place value, Rounding, Missing addends
Reading level: grades 3-4
Theme: The Great Spark City Bot Hunt — set in The Spark City Scrap Yard
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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