Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Golden Sky Compass

The Golden Sky Compass has been stolen from the grand airship! The culprit flew away into the clouds. As a Sky Patroller, you must help Captain Breeze track down the rogue sky-cadet before they hide the compass forever.

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 Skill	Pocket Gadget	Goggle Style	Hair Color	Hidden Weakness
Kira	Lightning Dash	Mini Drone	Wears brass goggles	Fiery red hair	Ticklish underarms
Luna	Wind Blast	Grappling Hook	Wears brass goggles	Sun yellow hair	Scared of heights
Pip	Wind Blast	Glider Wings	No goggles on head	Fiery red hair	Allergic to pine
Toby	Lightning Dash	Grappling Hook	No goggles on head	Fiery red hair	Allergic to pine
Zoey	Lightning Dash	Glider Wings	Wears brass goggles	Sun yellow hair	Ticklish underarms
Nova	Star Navigation	Mini Drone	No goggles on head	Spiky blue hair	Allergic to pine
Skye	Wind Blast	Spy Telescope	No goggles on head	Spiky blue hair	Ticklish underarms
Ben	Star Navigation	Glider Wings	No goggles on head	Fiery red hair	Ticklish underarms
Cleo	Storm Summon	Grappling Hook	Wears brass goggles	Fiery red hair	Ticklish underarms
Max	Star Navigation	Spy Telescope	Wears brass goggles	Spiky blue hair	Ticklish underarms
Jax	Wind Blast	Glider Wings	Wears brass goggles	Fiery red hair	Allergic to pine
Maya	Wind Blast	Smoke Bombs	No goggles on head	Sun yellow hair	Scared of heights
Otis	Wind Blast	Grappling Hook	No goggles on head	Sun yellow hair	Scared of heights
Tess	Star Navigation	Mini Drone	Wears brass goggles	Fiery red hair	Ticklish underarms
Mia	Wind Blast	Mini Drone	Wears brass goggles	Fiery red hair	Ticklish underarms
Hugo	Star Navigation	Spy Telescope	Wears brass goggles	Fiery red hair	Allergic to pine
Kip	Wind Blast	Mini Drone	No goggles on head	Sun yellow hair	Allergic to pine
Remy	Cloud Stealth	Mini Drone	Wears brass goggles	Sun yellow hair	Scared of heights
Zane	Star Navigation	Glider Wings	No goggles on head	Sun yellow hair	Ticklish underarms
Finn	Star Navigation	Smoke Bombs	Wears brass goggles	Fiery red hair	Ticklish underarms
Cody	Star Navigation	Grappling Hook	No goggles on head	Spiky blue hair	Scared of heights

Clue 1

Rounding

Our sky-radar screen is fuzzy. It only shows the altitude rounded to the nearest ten feet.

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

200

130

9000

2300

290

3000

2000

290

430

1100

170

9000

370

430

170

200

370

9000

370

5000

170

1700

9000

170

5000

370

Round 178 to the nearest hundredT

Round 91 to the nearest tenU

Round 8,746 to the nearest thousandE

Round 168 to the nearest tenO

Round 48 to the nearest tenB

Round 4,543 to the nearest thousandM

Round 132 to the nearest tenH

Round 1,684 to the nearest hundredK

Round 434 to the nearest tenN

Round 1,054 to the nearest hundredD

Round 1,691 to the nearest thousandA

Round 286 to the nearest tenI

Round 3,308 to the nearest thousandL

Round 2,278 to the nearest hundredV

Round 367 to the nearest tenS

0/15 letters found

Clue 2

Addition

We need to count all the extra wind-sails on the deck. Let's add up the small and large sails.

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

2507

6480

3563

6488

9076

6488

5791

3563

4637

2507

9524

3563

9096

5869

6488

3424

5869

9096

6488

2063

6202

2063

6611

3563

6488

1445 + 1062 =T

3418 + 3062 =H

1189 + 874 =G

2115 + 4087 =O

3298 + 3313 =L

5303 + 3793 =A

2616 + 2021 =C

4051 + 1740 =P

5350 + 4174 =W

3181 + 2688 =R

2774 + 3714 =S

2200 + 1224 =B

6158 + 2918 =U

1191 + 2372 =E

0/14 letters found

Clue 3

Subtraction

The water ballast tank is leaking. We must calculate how much water we lost during the chase.

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

6823

3112

1752

6823

1044

1257

7069

1752

6823

3112

1044

7932

6823

6361

8062

1977

6603

6361

7932

3112

3814

7689

8682

1752

1257

1044

1257

4868

7932

7630 - 807 =T

10532 - 3463 =G

10686 - 2754 =S

13581 - 4899 =D

6734 - 4757 =K

11755 - 3693 =C

7978 - 4164 =U

1554 - 510 =A

5966 - 4214 =E

8574 - 2213 =I

9518 - 2915 =L

8157 - 468 =N

2299 - 1042 =R

6874 - 2006 =M

5114 - 2002 =H

0/15 letters found

Clue 4

Multiplication facts (1-12)

Look at the cargo hold! There are several neat rows of glowing sky-lanterns we need to count.

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

144

9 × 8 =W

10 × 5 =F

7 × 7 =Y

10 × 9 =A

11 × 2 =U

9 × 11 =I

7 × 2 =E

1 × 8 =C

7 × 10 =R

6 × 11 =S

1 × 11 =D

12 × 12 =N

11 × 5 =H

1 × 7 =T

9 × 1 =O

0/15 letters found

Clue 5

Division facts (1-12) — the last clue

We found a bag of gold sky-tokens. We must share them equally among our crew members.

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

1 ÷ 1 = ?

55 ÷ 11 = ?

32 ÷ 8 = ?

18 ÷ 6 = ?

54 ÷ 6 = ?

88 ÷ 11 = ?

55 ÷ 5 = ?

56 ÷ 8 = ?

110 ÷ 11 = ?

132 ÷ 11 = ?

6 ÷ 3 = ?

Step 2 — cross out the sentence with each answer

1.The villain performs a lightning dash, then deploys a tiny mini drone.

2.The villain starts a storm summon, then peers through a spy telescope.

3.The villain starts a storm summon, then soars away on glider wings.

4.The villain uses star navigation, then deploys a tiny mini drone.

5.The villain creates a huge wind blast, then deploys a tiny mini drone.

6.The villain starts a storm summon, then swings using a grappling hook.

7.The villain performs a lightning dash, then soars away on glider wings.

8.The villain creates a huge wind blast, then peers through a spy telescope.

9.The villain creates a huge wind blast, then swings using a grappling hook.

10.The villain performs a lightning dash, then peers through a spy telescope.

11.The villain performs a lightning dash, then swings using a grappling hook.

12.The villain starts a storm summon, then vanishes in a cloud of smoke bombs.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Case of the Golden Sky Compass

Culprit: Cleo (Storm Summon · Grappling Hook · Wears brass goggles · Fiery red hair · Ticklish underarms)

Clue 1 (Rounding): "THE VILLAIN DOES NOT USE SMOKE BOMBS"
Round 178 to the nearest hundred = 200 (T) · Round 91 to the nearest ten = 90 (U) · Round 8,746 to the nearest thousand = 9000 (E) · Round 168 to the nearest ten = 170 (O) · Round 48 to the nearest ten = 50 (B) · Round 4,543 to the nearest thousand = 5000 (M) · Round 132 to the nearest ten = 130 (H) · Round 1,684 to the nearest hundred = 1700 (K) · Round 434 to the nearest ten = 430 (N) · Round 1,054 to the nearest hundred = 1100 (D) · Round 1,691 to the nearest thousand = 2000 (A) · Round 286 to the nearest ten = 290 (I) · Round 3,308 to the nearest thousand = 3000 (L) · Round 2,278 to the nearest hundred = 2300 (V) · Round 367 to the nearest ten = 370 (S)
Clue 2 (Addition): "THE SUSPECT WEARS BRASS GOGGLES"
1445 + 1062 = 2507 (T) · 3418 + 3062 = 6480 (H) · 1189 + 874 = 2063 (G) · 2115 + 4087 = 6202 (O) · 3298 + 3313 = 6611 (L) · 5303 + 3793 = 9096 (A) · 2616 + 2021 = 4637 (C) · 4051 + 1740 = 5791 (P) · 5350 + 4174 = 9524 (W) · 3181 + 2688 = 5869 (R) · 2774 + 3714 = 6488 (S) · 2200 + 1224 = 3424 (B) · 6158 + 2918 = 9076 (U) · 1191 + 2372 = 3563 (E)
Clue 3 (Subtraction): "THE TARGET HAS TICKLISH UNDERARMS"
7630 - 807 = 6823 (T) · 10532 - 3463 = 7069 (G) · 10686 - 2754 = 7932 (S) · 13581 - 4899 = 8682 (D) · 6734 - 4757 = 1977 (K) · 11755 - 3693 = 8062 (C) · 7978 - 4164 = 3814 (U) · 1554 - 510 = 1044 (A) · 5966 - 4214 = 1752 (E) · 8574 - 2213 = 6361 (I) · 9518 - 2915 = 6603 (L) · 8157 - 468 = 7689 (N) · 2299 - 1042 = 1257 (R) · 6874 - 2006 = 4868 (M) · 5114 - 2002 = 3112 (H)
Clue 4 (Multiplication facts (1-12)): "WE FOUND FIERY RED HAIR AT THE SCENE"
9 × 8 = 72 (W) · 10 × 5 = 50 (F) · 7 × 7 = 49 (Y) · 10 × 9 = 90 (A) · 11 × 2 = 22 (U) · 9 × 11 = 99 (I) · 7 × 2 = 14 (E) · 1 × 8 = 8 (C) · 7 × 10 = 70 (R) · 6 × 11 = 66 (S) · 1 × 11 = 11 (D) · 12 × 12 = 144 (N) · 11 × 5 = 55 (H) · 1 × 7 = 7 (T) · 9 × 1 = 9 (O)
Clue 5 (Division facts (1-12)): surviving statement (box 6) → Cleo
1 ÷ 1 = 1 · 55 ÷ 11 = 5 · 32 ÷ 8 = 4 · 18 ÷ 6 = 3 · 54 ÷ 6 = 9 · 88 ÷ 11 = 8 · 55 ÷ 5 = 11 · 56 ÷ 8 = 7 · 110 ÷ 11 = 10 · 132 ÷ 11 = 12 · 6 ÷ 3 = 2

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 Golden Sky Compass — set in The floating island of Zephyr
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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