Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Missing Golden Compass

Someone sneaked into the Port Horizon Museum and took the Golden Compass. The clues left behind will help you track down the rogue explorer.

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 Gadget	Secret Skill	Tapping Foot	Bandana Color	Fear Factor
Wren Wilder	Pocket Radar	Lock Picking	Left Foot Tapper	Green Bandana	Afraid of Heights
Agent Ivy	Sonar Watch	Code Breaking	Left Foot Tapper	Red Bandana	Afraid of Heights
Tracker Sam	Sonar Watch	Knot Tying	Right Foot Tapper	Red Bandana	Afraid of Bats
Cadet Finn	Glider Wings	Code Breaking	Left Foot Tapper	Red Bandana	Afraid of Snakes
Otis Sterling	Sonar Watch	Track Finding	Left Foot Tapper	Blue Bandana	Afraid of Bats
Guide Max	Mag Lens	Map Reading	Left Foot Tapper	Green Bandana	Afraid of Bats
Captain Arlo	Pocket Radar	Knot Tying	Right Foot Tapper	Red Bandana	Afraid of Snakes
Dash Parker	Sonar Watch	Lock Picking	Left Foot Tapper	Red Bandana	Afraid of Heights
Sienna Frost	Grappling Hook	Code Breaking	Right Foot Tapper	Blue Bandana	Afraid of Snakes
Ranger Leo	Glider Wings	Track Finding	Right Foot Tapper	Green Bandana	Afraid of Bats
Piper Reed	Mag Lens	Code Breaking	Left Foot Tapper	Green Bandana	Afraid of Bats
Explorer Nora	Mag Lens	Code Breaking	Left Foot Tapper	Blue Bandana	Afraid of Heights
Rover Jasper	Mag Lens	Knot Tying	Right Foot Tapper	Green Bandana	Afraid of Snakes
Hunter Ruby	Glider Wings	Code Breaking	Left Foot Tapper	Blue Bandana	Afraid of Bats
Skye Bennett	Glider Wings	Track Finding	Left Foot Tapper	Green Bandana	Afraid of Bats
Felix Cruz	Pocket Radar	Code Breaking	Left Foot Tapper	Blue Bandana	Afraid of Snakes
Hazel Rivers	Glider Wings	Knot Tying	Left Foot Tapper	Green Bandana	Afraid of Bats
Cody Vance	Mag Lens	Track Finding	Left Foot Tapper	Green Bandana	Afraid of Heights
Milo Stone	Sonar Watch	Lock Picking	Left Foot Tapper	Green Bandana	Afraid of Bats
Sailor Eli	Grappling Hook	Lock Picking	Right Foot Tapper	Red Bandana	Afraid of Snakes
Pilot Kai	Glider Wings	Code Breaking	Right Foot Tapper	Green Bandana	Afraid of Bats

Clue 1

Rounding

The museum radar screen rounded the intruder's altitude 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.

1100

230

7000

2900

110

3000

110

130

290

7000

130

290

1100

430

7000

200

130

290

1100

2300

110

130

1700

Round 1,099 to the nearest hundredT

Round 2,901 to the nearest hundredV

Round 179 to the nearest hundredK

Round 3,287 to the nearest thousandL

Round 1,745 to the nearest hundredG

Round 289 to the nearest tenO

Round 234 to the nearest tenH

Round 53 to the nearest tenS

Round 7,277 to the nearest thousandE

Round 16 to the nearest tenA

Round 426 to the nearest tenU

Round 109 to the nearest tenI

Round 132 to the nearest tenN

Round 31 to the nearest tenD

Round 2,307 to the nearest hundredY

0/15 letters found

Clue 2

Addition

You tally up all the footprints found near the lobby floor.

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

8654

8671

5020

5958

3933

2414

6456

8654

4310

7143

5020

6456

3974

8671

5958

6389

7143

5958

5020

3187

3933

3495

3933

4310

5020

2414

8671

4920

3933

3379 + 5275 =W

5564 + 3107 =I

2970 + 3486 =A

4077 + 2312 =G

2166 + 3792 =N

1931 + 2002 =E

1674 + 2300 =P

914 + 1500 =S

1344 + 2151 =L

3397 + 1623 =T

2526 + 4617 =O

2031 + 2889 =D

2617 + 1693 =F

2044 + 1143 =H

0/14 letters found

Clue 3

Subtraction

You calculate how many gold coins are left after the theft.

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

4974

3778

2864

6299

7661

1609

2560

7661

3840

3976

2560

3840

2560

4060

2560

6203

4060

3778

2864

3840

4165

2560

4974

1622

2314

1609

2864

4060

4165

6203

8238 - 3264 =T

5614 - 4005 =L

5893 - 2053 =N

6636 - 3772 =E

5931 - 4309 =S

8172 - 4196 =R

5720 - 1555 =B

6829 - 4269 =A

8363 - 2160 =Y

4376 - 2062 =F

10284 - 3985 =V

9931 - 2270 =I

7906 - 4128 =H

6545 - 2485 =W

0/14 letters found

Clue 4

Multiplication facts (1-12)

You check the rows of supply crates stored in the basement.

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

121

9 × 5 =G

11 × 11 =D

7 × 1 =H

9 × 9 =L

3 × 1 =B

7 × 3 =R

9 × 11 =I

12 × 4 =S

11 × 1 =T

5 × 1 =C

2 × 7 =F

7 × 6 =E

8 × 8 =N

8 × 7 =A

5 × 4 =W

0/15 letters found

Clue 5

Division facts (1-12) — the last clue

You share the remaining clue cards equally among the team.

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

7 ÷ 7 = ?

8 ÷ 2 = ?

55 ÷ 11 = ?

36 ÷ 12 = ?

84 ÷ 7 = ?

42 ÷ 6 = ?

88 ÷ 11 = ?

60 ÷ 6 = ?

2 ÷ 1 = ?

33 ÷ 3 = ?

30 ÷ 5 = ?

Step 2 — cross out the sentence with each answer

1.The villain vaulted the counter, then followed the footprint.

2.The villain zapped the display case, then followed the footprint.

3.The villain vaulted the counter, then decoded the cipher.

4.The villain disarmed the alarm, then picked the lock.

5.The villain scanned the lock, then decoded the cipher.

6.The villain scouted the hallway, then decoded the cipher.

7.The villain disarmed the alarm, then tied up the gate.

8.The villain disarmed the alarm, then followed the footprint.

9.The villain scanned the lock, then read the secret map.

10.The villain zapped the display case, then picked the lock.

11.The villain vaulted the counter, then tied up the gate.

12.The villain scouted the hallway, then picked the lock.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Case of the Missing Golden Compass

Culprit: Guide Max (Mag Lens · Map Reading · Left Foot Tapper · Green Bandana · Afraid of Bats)

Clue 1 (Rounding): "THE VILLAIN DOES NOT USE KNOT TYING"
Round 1,099 to the nearest hundred = 1100 (T) · Round 2,901 to the nearest hundred = 2900 (V) · Round 179 to the nearest hundred = 200 (K) · Round 3,287 to the nearest thousand = 3000 (L) · Round 1,745 to the nearest hundred = 1700 (G) · Round 289 to the nearest ten = 290 (O) · Round 234 to the nearest ten = 230 (H) · Round 53 to the nearest ten = 50 (S) · Round 7,277 to the nearest thousand = 7000 (E) · Round 16 to the nearest ten = 20 (A) · Round 426 to the nearest ten = 430 (U) · Round 109 to the nearest ten = 110 (I) · Round 132 to the nearest ten = 130 (N) · Round 31 to the nearest ten = 30 (D) · Round 2,307 to the nearest hundred = 2300 (Y)
Clue 2 (Addition): "WITNESS SAW FOOT TAPPING ON THE LEFT SIDE"
3379 + 5275 = 8654 (W) · 5564 + 3107 = 8671 (I) · 2970 + 3486 = 6456 (A) · 4077 + 2312 = 6389 (G) · 2166 + 3792 = 5958 (N) · 1931 + 2002 = 3933 (E) · 1674 + 2300 = 3974 (P) · 914 + 1500 = 2414 (S) · 1344 + 2151 = 3495 (L) · 3397 + 1623 = 5020 (T) · 2526 + 4617 = 7143 (O) · 2031 + 2889 = 4920 (D) · 2617 + 1693 = 4310 (F) · 2044 + 1143 = 3187 (H)
Clue 3 (Subtraction): "THE VILLAIN RAN AWAY WHEN BATS FLEW BY"
8238 - 3264 = 4974 (T) · 5614 - 4005 = 1609 (L) · 5893 - 2053 = 3840 (N) · 6636 - 3772 = 2864 (E) · 5931 - 4309 = 1622 (S) · 8172 - 4196 = 3976 (R) · 5720 - 1555 = 4165 (B) · 6829 - 4269 = 2560 (A) · 8363 - 2160 = 6203 (Y) · 4376 - 2062 = 2314 (F) · 10284 - 3985 = 6299 (V) · 9931 - 2270 = 7661 (I) · 7906 - 4128 = 3778 (H) · 6545 - 2485 = 4060 (W)
Clue 4 (Multiplication facts (1-12)): "GREEN BANDANA FABRIC WAS LEFT AT THE SCENE"
9 × 5 = 45 (G) · 11 × 11 = 121 (D) · 7 × 1 = 7 (H) · 9 × 9 = 81 (L) · 3 × 1 = 3 (B) · 7 × 3 = 21 (R) · 9 × 11 = 99 (I) · 12 × 4 = 48 (S) · 11 × 1 = 11 (T) · 5 × 1 = 5 (C) · 2 × 7 = 14 (F) · 7 × 6 = 42 (E) · 8 × 8 = 64 (N) · 8 × 7 = 56 (A) · 5 × 4 = 20 (W)
Clue 5 (Division facts (1-12)): surviving statement (box 9) → Guide Max
7 ÷ 7 = 1 · 8 ÷ 2 = 4 · 55 ÷ 11 = 5 · 36 ÷ 12 = 3 · 84 ÷ 7 = 12 · 42 ÷ 6 = 7 · 88 ÷ 11 = 8 · 60 ÷ 6 = 10 · 2 ÷ 1 = 2 · 33 ÷ 3 = 11 · 30 ÷ 5 = 6

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Case of the Missing Golden Compass — set in Port Horizon Explorer Academy
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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