🏴☠️ Mermaids, Cats, Unicorns, PiGrade 5Reading: grades 5-6RoundingSubtractionMultiplicationFractions of a numberDivision
Mystery of the Sunken Catnip Treasure
Someone swiped the Golden Catnip Medallion from Harbor Master Barnaby's cabin! Search the Whispering Atoll, crack the mathematical codes left at the crime scene, and track down the culprit.
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 | Sea Ability | Enchanted Gear | Dominant Paw | Mane Color | Distraction Item |
|---|---|---|---|---|---|
| Salty Tail | Coral Shield | Pearl Shield | Right-Handed Paw | Deep Sea Blue Mane | Bright Laser Pointer |
| Splash Scurvy | Bubble Cannon | Anchor Blast | Right-Handed Paw | Deep Sea Blue Mane | Bright Laser Pointer |
| Starling Splash | Whirling Trident | Starfish Cloak | Right-Handed Paw | Aquamarine Mane | Squeaky Mouse |
| Pearl Paws | Whirling Trident | Anchor Blast | Left-Handed Paw | Coral Pink Mane | Bright Laser Pointer |
| Captain Kitt | Coral Shield | Anchor Blast | Right-Handed Paw | Aquamarine Mane | Bright Laser Pointer |
| Seashell Sam | Coral Shield | Starfish Cloak | Right-Handed Paw | Aquamarine Mane | Squeaky Mouse |
| Coral Claw | Tidal Roar | Wave Whistle | Left-Handed Paw | Deep Sea Blue Mane | Squeaky Mouse |
| Finneas Hook | Tidal Roar | Anchor Blast | Right-Handed Paw | Deep Sea Blue Mane | Bright Laser Pointer |
| Captain Calico | Bubble Cannon | Wave Whistle | Left-Handed Paw | Aquamarine Mane | Squeaky Mouse |
| Mako Meow | Seafoam Dash | Starfish Cloak | Left-Handed Paw | Deep Sea Blue Mane | Bright Laser Pointer |
| Buoy Bella | Bubble Cannon | Glow Horn | Left-Handed Paw | Deep Sea Blue Mane | Squeaky Mouse |
| Wave Purr | Whirling Trident | Glow Horn | Right-Handed Paw | Coral Pink Mane | Bright Laser Pointer |
| Admiral Tailspin | Seafoam Dash | Wave Whistle | Right-Handed Paw | Aquamarine Mane | Squeaky Mouse |
| Jellybean Jack | Bubble Cannon | Wave Whistle | Left-Handed Paw | Coral Pink Mane | Bright Laser Pointer |
| Marina Paws | Whirling Trident | Anchor Blast | Left-Handed Paw | Coral Pink Mane | Catnip Bell |
| Barnaby Whiskers | Whirling Trident | Wave Whistle | Right-Handed Paw | Deep Sea Blue Mane | Bright Laser Pointer |
| Pegleg Purrcival | Seafoam Dash | Glow Horn | Right-Handed Paw | Coral Pink Mane | Squeaky Mouse |
| Barnacle Bob | Tidal Roar | Anchor Blast | Left-Handed Paw | Aquamarine Mane | Squeaky Mouse |
| Gulliver Tail | Tidal Roar | Wave Whistle | Right-Handed Paw | Deep Sea Blue Mane | Squeaky Mouse |
| Tide Whisker | Coral Shield | Wave Whistle | Right-Handed Paw | Coral Pink Mane | Squeaky Mouse |
| Clawdia Tide | Coral Shield | Starfish Cloak | Right-Handed Paw | Deep Sea Blue Mane | Bright Laser Pointer |
Clue 1
Rounding
The captain checked the ship sonar display which rounds distances to the nearest hundred meters to spot the runaway vessel.
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
30
7000
2300
2900
4300
1700
300
300
500
1300
1700
90
200
110
2300
2900
170
110
T
30
430
2900
2300
1700
5000
2300
1700
230
300
2900
7000
1100
2300
300
200
Round 32 to the nearest tenT
Round 291 to the nearest hundredL
Round 1,346 to the nearest hundredW
Round 2,917 to the nearest hundredS
Round 110 to the nearest tenO
Round 1,137 to the nearest hundredI
Round 1,659 to the nearest hundredA
Round 427 to the nearest tenU
Round 157 to the nearest hundredD
Round 234 to the nearest tenR
Round 5,199 to the nearest thousandP
Round 174 to the nearest tenN
Round 88 to the nearest tenG
Round 6,619 to the nearest thousandH
Round 2,340 to the nearest hundredE
Round 4,325 to the nearest hundredC
Round 451 to the nearest hundredY
0/17 letters found
Clue 2
Subtraction
The quartermaster counted the gold coins left in the chest to calculate how much loot had been stolen.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
W
4777
7724
3326
2736
6319
8653
8653
8653
8840
W
4777
5064
7724
8121
6399
3326
6399
8840
2736
4553
6319
4553
7381
8840
W
4777
7736
2736
3326
7724
4553
6319
3712
8840
7381
6151 - 1374 =W
8010 - 1611 =H
5493 - 429 =R
3289 - 553 =N
12278 - 4554 =I
9400 - 1664 =O
5715 - 1162 =D
8390 - 4678 =M
10259 - 1419 =A
6420 - 3094 =T
11892 - 3239 =S
10352 - 2971 =P
10545 - 4226 =E
10222 - 2101 =G
0/14 letters found
Clue 3
Multiplication facts (1-12)
The sea scout measured five equal rows of floating barrels along the harbor wall.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
G
121
66
132
108
8
1
100
28
63
60
9
108
36
G
121
100
35
120
132
1
60
108
4
28
36
63
35
60
108
132
35
60
63
60
64
3
11 × 11 =G
4 × 2 =D
12 × 11 =A
5 × 12 =E
12 × 3 =I
12 × 9 =R
11 × 6 =U
1 × 4 =P
10 × 10 =H
1 × 9 =B
1 × 3 =Y
10 × 12 =L
8 × 8 =M
4 × 7 =O
1 × 1 =S
7 × 9 =N
7 × 5 =T
0/17 letters found
Clue 4
Fractions of a number
The deckhand looked at the map grid and calculated what fraction of the reef was covered in kelp.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
F
11
14
20
10
29
29
3
3
4
39
3
30
26
24
20
3
18
30
10
3
39
16
28
30
10
29
14
10
30
10
8
23
14
28
2/6 of 33 =F
2/5 of 65 =B
3/8 of 8 =E
6/8 of 32 =L
3/5 of 65 =S
1/2 of 8 =P
1/4 of 64 =T
2/5 of 20 =C
2/8 of 72 =M
2/10 of 150 =A
2/4 of 28 =O
4/8 of 40 =U
1/4 of 92 =H
1/6 of 60 =N
8/10 of 35 =R
1/2 of 58 =D
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
The purser evenly divided the fish biscuits into daily rations for the whole 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
66 ÷ 11 = ?
9 ÷ 1 = ?
20 ÷ 4 = ?
14 ÷ 2 = ?
20 ÷ 10 = ?
30 ÷ 10 = ?
40 ÷ 4 = ?
88 ÷ 11 = ?
12 ÷ 3 = ?
10 ÷ 10 = ?
66 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain let out a tidal roar, then blew a wave whistle.
2.The villain used the seafoam dash, then blew a wave whistle.
3.The villain fired the bubble cannon, then draped a starfish cloak.
4.The villain used the seafoam dash, then projected a pearl shield.
5.The villain swung the whirling trident, then blew a wave whistle.
6.The villain let out a tidal roar, then fired an anchor blast.
7.The villain used the seafoam dash, then fired an anchor blast.
8.The villain used the seafoam dash, then draped a starfish cloak.
9.The villain raised the coral shield, then draped a starfish cloak.
10.The villain fired the bubble cannon, then lit up a glow horn.
11.The villain raised the coral shield, then fired an anchor blast.
12.The villain fired the bubble cannon, then fired an anchor blast.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — Mystery of the Sunken Catnip Treasure
Culprit: Splash Scurvy (Bubble Cannon · Anchor Blast · Right-Handed Paw · Deep Sea Blue Mane · Bright Laser Pointer)
- Clue 1 (Rounding): "THE SCALLYWAG DOES NOT USE A PEARL SHIELD"Round 32 to the nearest ten = 30 (T) · Round 291 to the nearest hundred = 300 (L) · Round 1,346 to the nearest hundred = 1300 (W) · Round 2,917 to the nearest hundred = 2900 (S) · Round 110 to the nearest ten = 110 (O) · Round 1,137 to the nearest hundred = 1100 (I) · Round 1,659 to the nearest hundred = 1700 (A) · Round 427 to the nearest ten = 430 (U) · Round 157 to the nearest hundred = 200 (D) · Round 234 to the nearest ten = 230 (R) · Round 5,199 to the nearest thousand = 5000 (P) · Round 174 to the nearest ten = 170 (N) · Round 88 to the nearest ten = 90 (G) · Round 6,619 to the nearest thousand = 7000 (H) · Round 2,340 to the nearest hundred = 2300 (E) · Round 4,325 to the nearest hundred = 4300 (C) · Round 451 to the nearest hundred = 500 (Y)
- Clue 2 (Subtraction): "WITNESS SAW RIGHT HANDED PAW ON TIDE MAP"6151 - 1374 = 4777 (W) · 8010 - 1611 = 6399 (H) · 5493 - 429 = 5064 (R) · 3289 - 553 = 2736 (N) · 12278 - 4554 = 7724 (I) · 9400 - 1664 = 7736 (O) · 5715 - 1162 = 4553 (D) · 8390 - 4678 = 3712 (M) · 10259 - 1419 = 8840 (A) · 6420 - 3094 = 3326 (T) · 11892 - 3239 = 8653 (S) · 10352 - 2971 = 7381 (P) · 10545 - 4226 = 6319 (E) · 10222 - 2101 = 8121 (G)
- Clue 3 (Multiplication facts (1-12)): "GUARD SHONE BRIGHT LASER POINTER AT ENEMY"11 × 11 = 121 (G) · 4 × 2 = 8 (D) · 12 × 11 = 132 (A) · 5 × 12 = 60 (E) · 12 × 3 = 36 (I) · 12 × 9 = 108 (R) · 11 × 6 = 66 (U) · 1 × 4 = 4 (P) · 10 × 10 = 100 (H) · 1 × 9 = 9 (B) · 1 × 3 = 3 (Y) · 10 × 12 = 120 (L) · 8 × 8 = 64 (M) · 4 × 7 = 28 (O) · 1 × 1 = 1 (S) · 7 × 9 = 63 (N) · 7 × 5 = 35 (T)
- Clue 4 (Fractions of a number): "FOUND DEEP SEA BLUE MANE STRAND ON ANCHOR"2/6 of 33 = 11 (F) · 2/5 of 65 = 26 (B) · 3/8 of 8 = 3 (E) · 6/8 of 32 = 24 (L) · 3/5 of 65 = 39 (S) · 1/2 of 8 = 4 (P) · 1/4 of 64 = 16 (T) · 2/5 of 20 = 8 (C) · 2/8 of 72 = 18 (M) · 2/10 of 150 = 30 (A) · 2/4 of 28 = 14 (O) · 4/8 of 40 = 20 (U) · 1/4 of 92 = 23 (H) · 1/6 of 60 = 10 (N) · 8/10 of 35 = 28 (R) · 1/2 of 58 = 29 (D)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Splash Scurvy66 ÷ 11 = 6 · 9 ÷ 1 = 9 · 20 ÷ 4 = 5 · 14 ÷ 2 = 7 · 20 ÷ 10 = 2 · 30 ÷ 10 = 3 · 40 ÷ 4 = 10 · 88 ÷ 11 = 8 · 12 ÷ 3 = 4 · 10 ÷ 10 = 1 · 66 ÷ 6 = 11
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Rounding, Subtraction, Multiplication, Fractions of a number, Division
- Reading level
- grades 5-6
- Theme
- Mystery of the Sunken Catnip Treasure — set in Whispering Atoll
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects