🏴‍☠️ PiratesGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Mystery of Skulltooth Cove

Someone raided the Harbor Master tower at Skulltooth Cove and snatched the legendary golden telescope! The pirate crew left clues all across the dock. Use your math skills to narrow down the suspects!

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	Pirate Skill	Pirate Gear	Dominant Hand	Beard Style	Weakness
Ching Shih	Sword Sparring	Wooden Pegleg	Left Handed Grip	Red Bushy Beard	Tickled By Feathers
Woodes Rogers	Cannon Aiming	Feathered Hat	Right Handed Grip	Black Braided Beard	Tickled By Feathers
Thomas Tew	Map Reading	Feathered Hat	Right Handed Grip	Black Braided Beard	Tickled By Feathers
Captain Flint	Sword Sparring	Feathered Hat	Left Handed Grip	Silver Long Beard	Scared Of Parrots
Edward England	Anchor Flinging	Brass Spyglass	Left Handed Grip	Silver Long Beard	Tickled By Feathers
Grace O Malley	Rope Swinging	Brass Spyglass	Right Handed Grip	Red Bushy Beard	Tickled By Feathers
Stede Bonnet	Anchor Flinging	Feathered Hat	Left Handed Grip	Red Bushy Beard	Tickled By Feathers
Anne Bonny	Map Reading	Wooden Pegleg	Right Handed Grip	Black Braided Beard	Scared Of Parrots
Charles Vane	Rope Swinging	Silver Whistle	Left Handed Grip	Red Bushy Beard	Allergic To Seaweed
Smee	Sword Sparring	Wooden Pegleg	Left Handed Grip	Silver Long Beard	Scared Of Parrots
Captain Kidd	Rope Swinging	Silver Whistle	Left Handed Grip	Black Braided Beard	Tickled By Feathers
Jack Rackham	Rope Swinging	Silver Whistle	Right Handed Grip	Red Bushy Beard	Scared Of Parrots
Calico Jack	Map Reading	Wooden Pegleg	Left Handed Grip	Red Bushy Beard	Allergic To Seaweed
Captain Blackbeard	Rope Swinging	Gold Compass	Left Handed Grip	Red Bushy Beard	Tickled By Feathers
Charlotte Berry	Anchor Flinging	Gold Compass	Left Handed Grip	Red Bushy Beard	Allergic To Seaweed
Howell Davis	Cannon Aiming	Brass Spyglass	Right Handed Grip	Red Bushy Beard	Allergic To Seaweed
Samuel Bellamy	Sword Sparring	Silver Whistle	Left Handed Grip	Red Bushy Beard	Allergic To Seaweed
Henry Morgan	Rope Swinging	Brass Spyglass	Right Handed Grip	Red Bushy Beard	Allergic To Seaweed
Jean Lafitte	Map Reading	Brass Spyglass	Left Handed Grip	Red Bushy Beard	Tickled By Feathers
Bartholomew Roberts	Map Reading	Brass Spyglass	Left Handed Grip	Red Bushy Beard	Allergic To Seaweed
Sadie Goat	Cannon Aiming	Gold Compass	Left Handed Grip	Red Bushy Beard	Tickled By Feathers

Clue 1

Rounding

The harbor lookout radar rounds all ship distances to the nearest hundred leagues.

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

3700

230

9000

3000

500

700

290

170

9000

430

290

500

9000

3000

500

3700

7000

9000

2900

170

2900

1300

9000

2900

3700

230

9000

170

9000

290

230

2900

3700

Round 3,714 to the nearest hundredT

Round 168 to the nearest tenR

Round 289 to the nearest tenD

Round 2,649 to the nearest thousandS

Round 226 to the nearest tenH

Round 2,924 to the nearest hundredA

Round 6,501 to the nearest thousandW

Round 87 to the nearest tenN

Round 1,305 to the nearest hundredF

Round 32 to the nearest tenC

Round 434 to the nearest tenL

Round 9,037 to the nearest thousandE

Round 684 to the nearest hundredU

Round 473 to the nearest hundredO

0/14 letters found

Clue 2

Addition

Quartermaster Pete tallied up the wooden crates of sea biscuits found on deck.

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

4545

6275

5760

9099

6342

3688

5687

4545

2770

6275

4861

5687

6275

9099

2132

3688

6342

5687

4861

6342

9343

5760

7304

5687

9099

9681

6342

9681

7339

6563

6275

9418

3034 + 1511 =W

1234 + 898 =U

2988 + 3354 =E

2273 + 5031 =H

3798 + 1889 =A

3293 + 5806 =N

2495 + 4068 =R

2387 + 2474 =L

4021 + 5322 =F

3331 + 2429 =T

1295 + 1475 =V

4313 + 3026 =G

1569 + 2119 =S

6758 + 2923 =D

6195 + 3223 =P

2401 + 3874 =I

0/16 letters found

Clue 3

Subtraction

First Mate Maya counted the remaining barrels of fresh water after the voyage.

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

4708

5686

5296

5686

5490

4708

5686

6048

1075

8801

5686

4708

3557

5296

5686

3557

1102

5100

5686

6048

1102

3138

1102

3639

8495

4880

8797

5686

1102

5100

5686

1572

3639

8797

3557

3639

5490

9650 - 4942 =D

12993 - 4192 =S

5988 - 4886 =T

5676 - 2037 =I

7351 - 3794 =A

7693 - 4555 =O

11602 - 3107 =C

6875 - 1995 =K

6490 - 804 =E

9250 - 453 =L

6394 - 904 =N

9734 - 4438 =F

8331 - 3231 =H

5143 - 4068 =U

7678 - 1630 =R

4361 - 2789 =V

0/16 letters found

Clue 4

Multiplication facts (1-12)

The ship armorer arranged cannonballs into equal rows along the deck.

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

8 × 5 =D

5 × 1 =T

5 × 3 =N

1 × 7 =A

6 × 1 =Y

5 × 5 =F

5 × 6 =O

10 × 7 =H

4 × 8 =S

1 × 9 =U

5 × 9 =R

9 × 10 =I

11 × 6 =L

7 × 2 =B

5 × 2 =E

0/15 letters found

Clue 5

Division facts (1-12) — the last clue

Captain Redbeard split the stash of silver doubloons equally among the crew.

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

63 ÷ 7 = ?

6 ÷ 6 = ?

8 ÷ 2 = ?

60 ÷ 5 = ?

35 ÷ 7 = ?

88 ÷ 8 = ?

22 ÷ 11 = ?

18 ÷ 6 = ?

24 ÷ 3 = ?

35 ÷ 5 = ?

120 ÷ 12 = ?

Step 2 — cross out the sentence with each answer

1.The villain plotted a course on the chart, then peered through a brass spyglass.

2.The villain aimed the grand bronze cannon, then adjusted a tall feathered hat.

3.The villain plotted a course on the chart, then tapped a sturdy wooden pegleg.

4.The villain aimed the grand bronze cannon, then flashed a gleaming gold compass.

5.The villain heaved the heavy iron anchor, then tapped a sturdy wooden pegleg.

6.The villain sparred with a shiny cutlass, then flashed a gleaming gold compass.

7.The villain sparred with a shiny cutlass, then peered through a brass spyglass.

8.The villain aimed the grand bronze cannon, then peered through a brass spyglass.

9.The villain swung across on a thick rope, then tapped a sturdy wooden pegleg.

10.The villain aimed the grand bronze cannon, then tapped a sturdy wooden pegleg.

11.The villain sparred with a shiny cutlass, then blew a sharp silver whistle.

12.The villain heaved the heavy iron anchor, then flashed a gleaming gold compass.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of Skulltooth Cove

Culprit: Captain Blackbeard (Rope Swinging · Gold Compass · Left Handed Grip · Red Bushy Beard · Tickled By Feathers)

Clue 1 (Rounding): "THE SCOUNDREL DOES NOT WEAR A FEATHERED HAT"
Round 3,714 to the nearest hundred = 3700 (T) · Round 168 to the nearest ten = 170 (R) · Round 289 to the nearest ten = 290 (D) · Round 2,649 to the nearest thousand = 3000 (S) · Round 226 to the nearest ten = 230 (H) · Round 2,924 to the nearest hundred = 2900 (A) · Round 6,501 to the nearest thousand = 7000 (W) · Round 87 to the nearest ten = 90 (N) · Round 1,305 to the nearest hundred = 1300 (F) · Round 32 to the nearest ten = 30 (C) · Round 434 to the nearest ten = 430 (L) · Round 9,037 to the nearest thousand = 9000 (E) · Round 684 to the nearest hundred = 700 (U) · Round 473 to the nearest hundred = 500 (O)
Clue 2 (Addition): "WITNESS SAW VILLAIN USE A LEFT HANDED GRIP"
3034 + 1511 = 4545 (W) · 1234 + 898 = 2132 (U) · 2988 + 3354 = 6342 (E) · 2273 + 5031 = 7304 (H) · 3798 + 1889 = 5687 (A) · 3293 + 5806 = 9099 (N) · 2495 + 4068 = 6563 (R) · 2387 + 2474 = 4861 (L) · 4021 + 5322 = 9343 (F) · 3331 + 2429 = 5760 (T) · 1295 + 1475 = 2770 (V) · 4313 + 3026 = 7339 (G) · 1569 + 2119 = 3688 (S) · 6758 + 2923 = 9681 (D) · 6195 + 3223 = 9418 (P) · 2401 + 3874 = 6275 (I)
Clue 3 (Subtraction): "DEFENDER USED A FEATHER TO TICKLE THE VILLAIN"
9650 - 4942 = 4708 (D) · 12993 - 4192 = 8801 (S) · 5988 - 4886 = 1102 (T) · 5676 - 2037 = 3639 (I) · 7351 - 3794 = 3557 (A) · 7693 - 4555 = 3138 (O) · 11602 - 3107 = 8495 (C) · 6875 - 1995 = 4880 (K) · 6490 - 804 = 5686 (E) · 9250 - 453 = 8797 (L) · 6394 - 904 = 5490 (N) · 9734 - 4438 = 5296 (F) · 8331 - 3231 = 5100 (H) · 5143 - 4068 = 1075 (U) · 7678 - 1630 = 6048 (R) · 4361 - 2789 = 1572 (V)
Clue 4 (Multiplication facts (1-12)): "DEBRIS HELD STRANDS OF A RED BUSHY BEARD"
8 × 5 = 40 (D) · 5 × 1 = 5 (T) · 5 × 3 = 15 (N) · 1 × 7 = 7 (A) · 6 × 1 = 6 (Y) · 5 × 5 = 25 (F) · 5 × 6 = 30 (O) · 10 × 7 = 70 (H) · 4 × 8 = 32 (S) · 1 × 9 = 9 (U) · 5 × 9 = 45 (R) · 9 × 10 = 90 (I) · 11 × 6 = 66 (L) · 7 × 2 = 14 (B) · 5 × 2 = 10 (E)
Clue 5 (Division facts (1-12)): surviving statement (box 6) → Captain Blackbeard
63 ÷ 7 = 9 · 6 ÷ 6 = 1 · 8 ÷ 2 = 4 · 60 ÷ 5 = 12 · 35 ÷ 7 = 5 · 88 ÷ 8 = 11 · 22 ÷ 11 = 2 · 18 ÷ 6 = 3 · 24 ÷ 3 = 8 · 35 ÷ 5 = 7 · 120 ÷ 12 = 10

About this mystery

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

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