🏴☠️ Pirates, MinecraftGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Mystery of the Diamond Anchor
Someone snuck into the blocky shipyard and swiped the golden spyglass. Use your detective skills to crack the math clues and uncover the pirate thief.
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 | Special Gear | Ship Flag | Dominant Hand | Bandana Color | Fear |
|---|---|---|---|---|---|
| William Kidd | Diamond Sword | Kraken Flag | Right Handed | Obsidian Black | Splash Potion |
| Henry Morgan | Redstone Compass | Kraken Flag | Left Handed | Obsidian Black | Splash Potion |
| Samuel Bellamy | Enchanted Bow | Kraken Flag | Right Handed | Crimson Red | Bucket of Water |
| Israel Hands | Spyglass Cannon | Kraken Flag | Right Handed | Crimson Red | Bucket of Water |
| Captain Blackbeard | Redstone Compass | Anchor Flag | Left Handed | Crimson Red | Splash Potion |
| Stede Bonnet | Redstone Compass | Anchor Flag | Right Handed | Emerald Green | Iron Golem |
| Charles Vane | Diamond Sword | Kraken Flag | Right Handed | Obsidian Black | Iron Golem |
| Zheng Yi Sao | Diamond Sword | Skull Flag | Right Handed | Obsidian Black | Splash Potion |
| John Rackham | Redstone Compass | Anchor Flag | Left Handed | Obsidian Black | Iron Golem |
| Edward England | Diamond Sword | Parrot Flag | Left Handed | Obsidian Black | Splash Potion |
| Francois L Olonnais | Diamond Sword | Creeper Flag | Left Handed | Obsidian Black | Splash Potion |
| Anne Bonny | Diamond Sword | Creeper Flag | Left Handed | Obsidian Black | Bucket of Water |
| Jean Lafitte | TNT Barrel | Creeper Flag | Left Handed | Crimson Red | Iron Golem |
| Ned Low | Diamond Sword | Creeper Flag | Right Handed | Obsidian Black | Bucket of Water |
| Bartholomew Roberts | TNT Barrel | Skull Flag | Left Handed | Crimson Red | Splash Potion |
| Woodes Rogers | Enchanted Bow | Anchor Flag | Left Handed | Obsidian Black | Splash Potion |
| Black Caesar | TNT Barrel | Creeper Flag | Left Handed | Obsidian Black | Bucket of Water |
| Mary Read | TNT Barrel | Anchor Flag | Left Handed | Obsidian Black | Bucket of Water |
| George Lowther | Enchanted Bow | Creeper Flag | Right Handed | Crimson Red | Splash Potion |
| Calico Jack | TNT Barrel | Creeper Flag | Left Handed | Obsidian Black | Splash Potion |
| Thomas Tew | Diamond Sword | Creeper Flag | Right Handed | Crimson Red | Iron Golem |
Clue 1
Rounding
The lookout spyglass only shows rounded distance estimates on the naval scope.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
20
1300
130
3000
900
3700
3700
50
900
4300
700
30
130
170
4300
30
T
20
5000
3700
90
50
9000
50
2000
2000
30
T
20
5000
3700
50
500
Round 24 to the nearest tenT
Round 4,303 to the nearest hundredN
Round 923 to the nearest hundredI
Round 3,725 to the nearest hundredL
Round 33 to the nearest tenO
Round 1,847 to the nearest thousandR
Round 170 to the nearest tenS
Round 8,712 to the nearest thousandP
Round 90 to the nearest tenY
Round 132 to the nearest tenE
Round 1,341 to the nearest hundredH
Round 737 to the nearest hundredD
Round 4,918 to the nearest thousandF
Round 2,774 to the nearest thousandV
Round 48 to the nearest tenA
Round 480 to the nearest hundredG
0/16 letters found
Clue 2
Addition
The quartermaster tallied up all the extra wooden planks stored in the cargo hold.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
7686
4912
3119
T
7686
4912
6483
3119
6226
4912
3119
9161
9009
T
7686
4912
3119
6863
8429
7089
6483
5127
T
7686
4912
3119
6483
7256
9161
3119
6226
T
7686
4912
8429
5127
9009
4872 + 2814 =T
1765 + 3147 =H
2133 + 4350 =I
3763 + 3493 =R
3569 + 1558 =N
3511 + 5498 =D
3981 + 4448 =A
4192 + 4969 =L
2922 + 4167 =P
2550 + 3676 =F
1246 + 1873 =E
2139 + 4724 =M
0/12 letters found
Clue 3
Subtraction
The navigator calculated how many iron ingots were missing from the chest.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
8554
3747
5007
6297
A
8554
3747
3818
5007
3773
8922
7309
3773
3421
3747
7031
A
8554
4129
8050
8542
8922
3818
8050
8922
3818
7309
8050
2827
A
8554
2037
A
8554
7669
10206 - 1652 =A
13604 - 4682 =T
4712 - 1885 =F
7940 - 4167 =O
5645 - 1898 =S
6110 - 1981 =R
11336 - 4305 =C
9067 - 1398 =Y
6452 - 3031 =N
8256 - 4438 =H
3911 - 1874 =W
10759 - 2709 =E
10787 - 4490 =L
10546 - 2004 =D
8972 - 1663 =I
6847 - 1840 =P
0/16 letters found
Clue 4
Multiplication facts (1-12)
The shipwright counted equal rows of obsidian blocks stacked along the dock.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
O
45
21
20
144
90
144
96
4
56
9
28
42
96
90
20
64
42
28
42
90
28
O
45
48
48
42
90
4
42
96
28
56
9
42
90
O
45
70
121
5 × 9 =O
8 × 12 =A
10 × 2 =S
11 × 11 =K
7 × 8 =T
3 × 3 =H
12 × 12 =I
10 × 7 =C
4 × 7 =R
6 × 7 =E
1 × 4 =N
3 × 7 =B
9 × 10 =D
8 × 6 =P
8 × 8 =W
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
The captain divided the recovered emerald loot 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
30 ÷ 3 = ?
32 ÷ 8 = ?
10 ÷ 2 = ?
14 ÷ 7 = ?
35 ÷ 5 = ?
72 ÷ 12 = ?
66 ÷ 6 = ?
54 ÷ 6 = ?
5 ÷ 5 = ?
24 ÷ 3 = ?
9 ÷ 3 = ?
Step 2 — cross out the sentence with each answer
1.The villain crafted a heavy diamond sword, then waved a giant kraken flag.
2.The villain fired a spyglass cannon, then raised a green creeper flag.
3.The villain aimed an enchanted bow, then hoisted a spooky skull flag.
4.The villain aimed an enchanted bow, then unfurled a heavy anchor flag.
5.The villain crafted a heavy diamond sword, then raised a green creeper flag.
6.The villain aimed an enchanted bow, then waved a giant kraken flag.
7.The villain lit a hidden tnt barrel, then unfurled a heavy anchor flag.
8.The villain lit a hidden tnt barrel, then flew a bright parrot flag.
9.The villain fired a spyglass cannon, then unfurled a heavy anchor flag.
10.The villain set a tricky redstone compass, then waved a giant kraken flag.
11.The villain set a tricky redstone compass, then flew a bright parrot flag.
12.The villain lit a hidden tnt barrel, then raised a green creeper flag.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Diamond Anchor
Culprit: Calico Jack (TNT Barrel · Creeper Flag · Left Handed · Obsidian Black · Splash Potion)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT FLY A PARROT FLAG"Round 24 to the nearest ten = 20 (T) · Round 4,303 to the nearest hundred = 4300 (N) · Round 923 to the nearest hundred = 900 (I) · Round 3,725 to the nearest hundred = 3700 (L) · Round 33 to the nearest ten = 30 (O) · Round 1,847 to the nearest thousand = 2000 (R) · Round 170 to the nearest ten = 170 (S) · Round 8,712 to the nearest thousand = 9000 (P) · Round 90 to the nearest ten = 90 (Y) · Round 132 to the nearest ten = 130 (E) · Round 1,341 to the nearest hundred = 1300 (H) · Round 737 to the nearest hundred = 700 (D) · Round 4,918 to the nearest thousand = 5000 (F) · Round 2,774 to the nearest thousand = 3000 (V) · Round 48 to the nearest ten = 50 (A) · Round 480 to the nearest hundred = 500 (G)
- Clue 2 (Addition): "THE THIEF HELD THE MAP IN THEIR LEFT HAND"4872 + 2814 = 7686 (T) · 1765 + 3147 = 4912 (H) · 2133 + 4350 = 6483 (I) · 3763 + 3493 = 7256 (R) · 3569 + 1558 = 5127 (N) · 3511 + 5498 = 9009 (D) · 3981 + 4448 = 8429 (A) · 4192 + 4969 = 9161 (L) · 2922 + 4167 = 7089 (P) · 2550 + 3676 = 6226 (F) · 1246 + 1873 = 3119 (E) · 2139 + 4724 = 6863 (M)
- Clue 3 (Subtraction): "A SPLASH POTION SCARED THE THIEF AWAY"10206 - 1652 = 8554 (A) · 13604 - 4682 = 8922 (T) · 4712 - 1885 = 2827 (F) · 7940 - 4167 = 3773 (O) · 5645 - 1898 = 3747 (S) · 6110 - 1981 = 4129 (R) · 11336 - 4305 = 7031 (C) · 9067 - 1398 = 7669 (Y) · 6452 - 3031 = 3421 (N) · 8256 - 4438 = 3818 (H) · 3911 - 1874 = 2037 (W) · 10759 - 2709 = 8050 (E) · 10787 - 4490 = 6297 (L) · 10546 - 2004 = 8542 (D) · 8972 - 1663 = 7309 (I) · 6847 - 1840 = 5007 (P)
- Clue 4 (Multiplication facts (1-12)): "OBSIDIAN THREADS WERE DROPPED NEAR THE DOCK"5 × 9 = 45 (O) · 8 × 12 = 96 (A) · 10 × 2 = 20 (S) · 11 × 11 = 121 (K) · 7 × 8 = 56 (T) · 3 × 3 = 9 (H) · 12 × 12 = 144 (I) · 10 × 7 = 70 (C) · 4 × 7 = 28 (R) · 6 × 7 = 42 (E) · 1 × 4 = 4 (N) · 3 × 7 = 21 (B) · 9 × 10 = 90 (D) · 8 × 6 = 48 (P) · 8 × 8 = 64 (W)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Calico Jack30 ÷ 3 = 10 · 32 ÷ 8 = 4 · 10 ÷ 2 = 5 · 14 ÷ 7 = 2 · 35 ÷ 5 = 7 · 72 ÷ 12 = 6 · 66 ÷ 6 = 11 · 54 ÷ 6 = 9 · 5 ÷ 5 = 1 · 24 ÷ 3 = 8 · 9 ÷ 3 = 3
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Diamond Anchor — set in Blocky Bay
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects