Grade 4Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision

The Cloudtop Citadel Mystery

Someone snuck into the Cloudtop Citadel tower and snatched the Golden Star Map! Use your math skills and evidence to find the sneaky sky pirate.

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	Sky Gear	Tricky Move	Dominant Hand	Hair Color	Defense Gadget
Zephyr Vance	Radar Goggles	Stuns with Flash	Left Handed	Bright Red	Loud Whistle
Nova Stratus	Glider Wings	Spins Whirlwinds	Left Handed	Deep Black	Sticky Foam
Maya Gust	Radar Goggles	Sounds Air Horn	Left Handed	Deep Black	Loud Whistle
Iris Nimbus	Smoke Bombs	Drops Net Traps	Right Handed	Golden Yellow	Sticky Foam
Barnaby Cloud	Grappling Hook	Sounds Air Horn	Right Handed	Bright Red	Loud Whistle
Leo Skylark	Radar Goggles	Sounds Air Horn	Left Handed	Deep Black	Sticky Foam
Tess Glider	Radar Goggles	Throws Water Balloons	Left Handed	Deep Black	Bright Flashlight
Astra Starling	Radar Goggles	Sounds Air Horn	Right Handed	Bright Red	Loud Whistle
Milo Horizon	Radar Goggles	Drops Net Traps	Left Handed	Bright Red	Loud Whistle
Otis Aviator	Radar Goggles	Sounds Air Horn	Right Handed	Bright Red	Sticky Foam
Ruby Radar	Smoke Bombs	Drops Net Traps	Right Handed	Bright Red	Sticky Foam
Toby Tempest	Glider Wings	Sounds Air Horn	Left Handed	Deep Black	Loud Whistle
Captain Orion	Glider Wings	Stuns with Flash	Right Handed	Deep Black	Loud Whistle
Felix Falcon	Grappling Hook	Sounds Air Horn	Right Handed	Bright Red	Sticky Foam
Sammy Squall	Radar Goggles	Spins Whirlwinds	Right Handed	Bright Red	Loud Whistle
Luna Aero	Smoke Bombs	Drops Net Traps	Left Handed	Bright Red	Sticky Foam
Finn Soar	Radar Goggles	Drops Net Traps	Right Handed	Deep Black	Sticky Foam
Rowan Drift	Grappling Hook	Spins Whirlwinds	Left Handed	Golden Yellow	Loud Whistle
Hazel Breeze	Grappling Hook	Throws Water Balloons	Right Handed	Bright Red	Loud Whistle
Skye Walker	Smoke Bombs	Stuns with Flash	Right Handed	Bright Red	Loud Whistle
Piper Gale	Glider Wings	Stuns with Flash	Right Handed	Bright Red	Sticky Foam

Clue 1

Addition

To find the clue code, Cadet Sam counted all the spare propeller blades stored in the two sky cargo bays.

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

9367

9821

8371

4251

4954

8371

6399

2224

3768

2959

2977

3223

6399

2977

4954

9806

9150

8371

4251

4954

9150

9367

9821

3632

9150

5006

6399

9367

8371

3632

9578

6399

3223

9150

4954

4251

4206 + 5161 =T

1206 + 2562 =Y

2804 + 5567 =E

6357 + 3464 =H

2403 + 1848 =S

1562 + 1397 =V

3925 + 2474 =A

2265 + 1367 =R

1126 + 1851 =I

2080 + 1143 =L

3127 + 1879 =W

5477 + 4329 =D

3020 + 6130 =O

2386 + 2568 =N

894 + 1330 =K

5803 + 3775 =B

0/16 letters found

Clue 2

Rounding

The cloud radar screen only showed rounded numbers, so Navigator Skye rounded the distance to decode the signal.

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

900

2300

4300

500

2900

370

430

3700

7000

500

900

430

900

3700

3000

200

7000

500

4300

430

900

2300

2900

2300

1700

2300

7000

Round 430 to the nearest tenT

Round 2,296 to the nearest hundredE

Round 247 to the nearest hundredD

Round 90 to the nearest tenS

Round 7,249 to the nearest thousandR

Round 897 to the nearest hundredH

Round 527 to the nearest hundredI

Round 4,311 to the nearest hundredP

Round 374 to the nearest tenO

Round 3,693 to the nearest hundredA

Round 33 to the nearest tenW

Round 2,878 to the nearest thousandN

Round 73 to the nearest tenG

Round 2,883 to the nearest hundredL

Round 1,714 to the nearest hundredV

0/15 letters found

Clue 3

Subtraction

Officer Barnaby subtracted the damaged sky maps from the total deck supplies to reveal the next note.

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

6694

4994

6911

5579

3860

6911

2935

2578

8705

7724

6911

5579

1089

4994

6911

3860

2935

7724

7442

8813

5925

1089

4994

2637

5579

6694

7724

6911

2174

7724

7442

1089

5579

9414 - 2720 =T

9462 - 2020 =O

6245 - 1251 =H

3293 - 2204 =W

12816 - 4003 =U

7285 - 1706 =S

10015 - 3104 =E

6826 - 4652 =B

8383 - 2458 =D

7915 - 191 =L

3648 - 1011 =I

3651 - 1073 =K

4258 - 1323 =A

8825 - 4965 =N

11572 - 2867 =F

0/15 letters found

Clue 4

Multiplication facts (1-12)

Cadet Piper lined up four rows of compasses to calculate the grid code needed for the 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.

100

108

1 × 3 =R

3 × 9 =D

9 × 12 =P

9 × 10 =E

7 × 1 =U

12 × 8 =N

11 × 4 =S

7 × 12 =T

1 × 6 =W

7 × 7 =K

9 × 6 =C

10 × 10 =I

5 × 11 =H

1 × 11 =O

8 × 7 =A

9 × 11 =F

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

Pilot Zephyr split the emergency rescue ropes evenly among the airship stations to unmask the final hint.

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

6 ÷ 3 = ?

100 ÷ 10 = ?

6 ÷ 1 = ?

24 ÷ 2 = ?

55 ÷ 11 = ?

7 ÷ 1 = ?

11 ÷ 11 = ?

12 ÷ 4 = ?

99 ÷ 9 = ?

36 ÷ 4 = ?

32 ÷ 4 = ?

Step 2 — cross out the sentence with each answer

1.The villain creates a thick smoke cloud, then blares a loud air horn.

2.The villain spots targets with radar goggles, then spins quick whirlwinds around.

3.The villain zooms past on jet boots, then spins quick whirlwinds around.

4.The villain swings on a grappling hook, then blares a loud air horn.

5.The villain spots targets with radar goggles, then throws cold water balloons.

6.The villain creates a thick smoke cloud, then stuns guards with a bright flash.

7.The villain creates a thick smoke cloud, then drops heavy net traps on the deck.

8.The villain swings on a grappling hook, then throws cold water balloons.

9.The villain zooms past on jet boots, then stuns guards with a bright flash.

10.The villain spots targets with radar goggles, then blares a loud air horn.

11.The villain glides across the sky, then blares a loud air horn.

12.The villain glides across the sky, then stuns guards with a bright flash.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Cloudtop Citadel Mystery

Culprit: Barnaby Cloud (Grappling Hook · Sounds Air Horn · Right Handed · Bright Red · Loud Whistle)

Clue 1 (Addition): "THE SNEAKY VILLAIN DOES NOT THROW WATER BALLOONS"
4206 + 5161 = 9367 (T) · 1206 + 2562 = 3768 (Y) · 2804 + 5567 = 8371 (E) · 6357 + 3464 = 9821 (H) · 2403 + 1848 = 4251 (S) · 1562 + 1397 = 2959 (V) · 3925 + 2474 = 6399 (A) · 2265 + 1367 = 3632 (R) · 1126 + 1851 = 2977 (I) · 2080 + 1143 = 3223 (L) · 3127 + 1879 = 5006 (W) · 5477 + 4329 = 9806 (D) · 3020 + 6130 = 9150 (O) · 2386 + 2568 = 4954 (N) · 894 + 1330 = 2224 (K) · 5803 + 3775 = 9578 (B)
Clue 2 (Rounding): "THE PILOT SAW A RIGHT HAND GRIP THE LEVER"
Round 430 to the nearest ten = 430 (T) · Round 2,296 to the nearest hundred = 2300 (E) · Round 247 to the nearest hundred = 200 (D) · Round 90 to the nearest ten = 90 (S) · Round 7,249 to the nearest thousand = 7000 (R) · Round 897 to the nearest hundred = 900 (H) · Round 527 to the nearest hundred = 500 (I) · Round 4,311 to the nearest hundred = 4300 (P) · Round 374 to the nearest ten = 370 (O) · Round 3,693 to the nearest hundred = 3700 (A) · Round 33 to the nearest ten = 30 (W) · Round 2,878 to the nearest thousand = 3000 (N) · Round 73 to the nearest ten = 70 (G) · Round 2,883 to the nearest hundred = 2900 (L) · Round 1,714 to the nearest hundred = 1700 (V)
Clue 3 (Subtraction): "THE SNEAK FLEES WHEN A LOUD WHISTLE BLOWS"
9414 - 2720 = 6694 (T) · 9462 - 2020 = 7442 (O) · 6245 - 1251 = 4994 (H) · 3293 - 2204 = 1089 (W) · 12816 - 4003 = 8813 (U) · 7285 - 1706 = 5579 (S) · 10015 - 3104 = 6911 (E) · 6826 - 4652 = 2174 (B) · 8383 - 2458 = 5925 (D) · 7915 - 191 = 7724 (L) · 3648 - 1011 = 2637 (I) · 3651 - 1073 = 2578 (K) · 4258 - 1323 = 2935 (A) · 8825 - 4965 = 3860 (N) · 11572 - 2867 = 8705 (F)
Clue 4 (Multiplication facts (1-12)): "RED STRANDS WERE FOUND ON THE AIRSHIP DECK"
1 × 3 = 3 (R) · 3 × 9 = 27 (D) · 9 × 12 = 108 (P) · 9 × 10 = 90 (E) · 7 × 1 = 7 (U) · 12 × 8 = 96 (N) · 11 × 4 = 44 (S) · 7 × 12 = 84 (T) · 1 × 6 = 6 (W) · 7 × 7 = 49 (K) · 9 × 6 = 54 (C) · 10 × 10 = 100 (I) · 5 × 11 = 55 (H) · 1 × 11 = 11 (O) · 8 × 7 = 56 (A) · 9 × 11 = 99 (F)
Clue 5 (Division facts (1-12)): surviving statement (box 4) → Barnaby Cloud
6 ÷ 3 = 2 · 100 ÷ 10 = 10 · 6 ÷ 1 = 6 · 24 ÷ 2 = 12 · 55 ÷ 11 = 5 · 7 ÷ 1 = 7 · 11 ÷ 11 = 1 · 12 ÷ 4 = 3 · 99 ÷ 9 = 11 · 36 ÷ 4 = 9 · 32 ÷ 4 = 8

About this mystery

Grade level: Grade 4 math
Math topics: Addition, Rounding, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Cloudtop Citadel Mystery — set in The Cloudtop Citadel
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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