🏴☠️ Pirates, MermaidsGrade 3Reading: grades 1-2RoundingAdditionSubtractionMultiplicationDivision
The Case of the Lost Pearl Crown
The Mermaid Queen's magical pearl crown is gone! A sneaky sea thief took it from the coral castle. Can you help us find the 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 | Sea Magic | Pirate Gear | Swim Style | Seaweed Hair | Scared of |
|---|---|---|---|---|---|
| Splash | bubbleblower | magic map | lefty splash | green kelp hair | tickly feathers |
| Marina | bubbleblower | iron cutlass | righty splash | blue algae hair | loud whistles |
| Pearl | stormcaller | iron cutlass | righty splash | blue algae hair | shiny mirrors |
| Captain Barnacle | wavespinner | shiny spyglass | lefty splash | pink coral hair | loud whistles |
| Shelly | bubbleblower | shiny spyglass | righty splash | blue algae hair | tickly feathers |
| Delphine | wavespinner | iron cutlass | righty splash | green kelp hair | loud whistles |
| Jolly Roger | stormcaller | silver hook | righty splash | pink coral hair | shiny mirrors |
| Salty Sam | bubbleblower | silver hook | righty splash | blue algae hair | shiny mirrors |
| Captain Redbeard | bubbleblower | silver hook | righty splash | pink coral hair | tickly feathers |
| Neptuna | wavespinner | magic map | lefty splash | blue algae hair | shiny mirrors |
| Calico Jack | bubbleblower | golden compass | righty splash | blue algae hair | shiny mirrors |
| Sirena | stormcaller | iron cutlass | lefty splash | blue algae hair | shiny mirrors |
| Anne Bonny | wavespinner | shiny spyglass | lefty splash | green kelp hair | tickly feathers |
| Long John Silver | wavespinner | magic map | righty splash | blue algae hair | shiny mirrors |
| Billy Bones | stormcaller | magic map | righty splash | pink coral hair | shiny mirrors |
| Captain Hook | fishwhisperer | golden compass | righty splash | pink coral hair | shiny mirrors |
| Waverly | stormcaller | iron cutlass | righty splash | blue algae hair | loud whistles |
| Pegleg Pete | tideturner | magic map | righty splash | blue algae hair | shiny mirrors |
| Smee | fishwhisperer | iron cutlass | righty splash | pink coral hair | loud whistles |
| Captain Blackbeard | tideturner | silver hook | righty splash | blue algae hair | shiny mirrors |
| Sandy | bubbleblower | golden compass | lefty splash | green kelp hair | shiny mirrors |
Clue 1
Rounding
A sea turtle looks at the ship radar. The radar only shows rounded numbers. Round the numbers to find the first 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.
T
500
80
700
400
7000
8000
200
T
500
700
6000
30
700
9000
20
30
T
500
80
200
600
700
200
9000
7000
50
600
700
8000
80
30
30
300
Round 522 to the nearest hundredT
Round 554 to the nearest hundredV
Round 7,329 to the nearest thousandI
Round 32 to the nearest tenO
Round 5,563 to the nearest thousandD
Round 722 to the nearest hundredE
Round 46 to the nearest tenL
Round 163 to the nearest hundredA
Round 7,733 to the nearest thousandR
Round 78 to the nearest tenH
Round 426 to the nearest hundredP
Round 271 to the nearest hundredK
Round 24 to the nearest tenN
Round 8,601 to the nearest thousandS
0/14 letters found
Clue 2
Addition
We find a treasure chest of gold coins. Let us count them. Add the piles of coins together to unlock the next 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.
T
217
743
283
761
552
763
936
761
743
554
665
T
217
743
283
822
889
286
743
T
217
761
889
331
283
581
936
761
743
229
286
283
124 + 93 =T
354 + 198 =P
145 + 138 =E
224 + 107 =D
393 + 543 =A
510 + 379 =I
312 + 431 =H
232 + 433 =N
356 + 198 =O
354 + 227 =W
161 + 68 =U
165 + 121 =G
398 + 424 =R
497 + 266 =L
485 + 276 =S
0/15 letters found
Clue 3
Subtraction
A hungry shark ate some of our shiny pearls. How many do we have left? Subtract the numbers to get the third 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.
T
421
766
500
330
831
798
104
798
214
798
330
718
831
141
829
T
421
766
500
442
831
866
138
766
T
421
829
866
831
831
141
831
718 - 297 =T
219 - 115 =N
1240 - 374 =I
507 - 366 =O
1148 - 319 =M
1048 - 330 =F
425 - 287 =G
354 - 24 =Y
253 - 39 =W
1010 - 179 =R
508 - 66 =B
1141 - 343 =A
1145 - 379 =H
709 - 209 =E
0/14 letters found
Clue 4
Multiplication facts (1-12)
The mermaids swim in neat rows. Each row has the same number of mermaids. Multiply the rows to find the fourth 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.
W
2
121
64
132
84
44
96
81
100
84
121
55
100
21
55
121
28
44
70
49
121
32
55
44
96
2 × 1 =W
10 × 10 =L
11 × 12 =O
9 × 9 =B
4 × 11 =N
12 × 7 =U
3 × 7 =G
7 × 10 =T
8 × 8 =F
8 × 12 =D
11 × 11 =E
7 × 4 =I
4 × 8 =S
7 × 7 =H
5 × 11 =A
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
We must share our delicious seaweed snacks equally among the crew. Divide the snacks to get the final clue.
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
11 ÷ 11 = ?
50 ÷ 10 = ?
15 ÷ 5 = ?
42 ÷ 6 = ?
12 ÷ 3 = ?
2 ÷ 1 = ?
40 ÷ 4 = ?
9 ÷ 1 = ?
132 ÷ 12 = ?
24 ÷ 3 = ?
42 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain turns the ocean tide, then points to a magic map.
2.The villain calls a sudden storm, then checks a golden compass.
3.The villain blows a wall of bubbles, then checks a golden compass.
4.The villain blows a wall of bubbles, then waves a silver hook.
5.The villain spins a giant whirlpool, then points to a magic map.
6.The villain talks to the helper fish, then checks a golden compass.
7.The villain blows a wall of bubbles, then polishes an iron cutlass.
8.The villain spins a giant whirlpool, then polishes an iron cutlass.
9.The villain calls a sudden storm, then points to a magic map.
10.The villain spins a giant whirlpool, then waves a silver hook.
11.The villain turns the ocean tide, then looks through a shiny spyglass.
12.The villain calls a sudden storm, then polishes an iron cutlass.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Lost Pearl Crown
Culprit: Pearl (stormcaller · iron cutlass · righty splash · blue algae hair · shiny mirrors)
- Clue 1 (Rounding): "THE PIRATE DOES NOT HAVE A SILVER HOOK"Round 522 to the nearest hundred = 500 (T) · Round 554 to the nearest hundred = 600 (V) · Round 7,329 to the nearest thousand = 7000 (I) · Round 32 to the nearest ten = 30 (O) · Round 5,563 to the nearest thousand = 6000 (D) · Round 722 to the nearest hundred = 700 (E) · Round 46 to the nearest ten = 50 (L) · Round 163 to the nearest hundred = 200 (A) · Round 7,733 to the nearest thousand = 8000 (R) · Round 78 to the nearest ten = 80 (H) · Round 426 to the nearest hundred = 400 (P) · Round 271 to the nearest hundred = 300 (K) · Round 24 to the nearest ten = 20 (N) · Round 8,601 to the nearest thousand = 9000 (S)
- Clue 2 (Addition): "THE SPLASH ON THE RIGHT SIDE WAS HUGE"124 + 93 = 217 (T) · 354 + 198 = 552 (P) · 145 + 138 = 283 (E) · 224 + 107 = 331 (D) · 393 + 543 = 936 (A) · 510 + 379 = 889 (I) · 312 + 431 = 743 (H) · 232 + 433 = 665 (N) · 356 + 198 = 554 (O) · 354 + 227 = 581 (W) · 161 + 68 = 229 (U) · 165 + 121 = 286 (G) · 398 + 424 = 822 (R) · 497 + 266 = 763 (L) · 485 + 276 = 761 (S)
- Clue 3 (Subtraction): "THEY RAN AWAY FROM THE BRIGHT MIRROR"718 - 297 = 421 (T) · 219 - 115 = 104 (N) · 1240 - 374 = 866 (I) · 507 - 366 = 141 (O) · 1148 - 319 = 829 (M) · 1048 - 330 = 718 (F) · 425 - 287 = 138 (G) · 354 - 24 = 330 (Y) · 253 - 39 = 214 (W) · 1010 - 179 = 831 (R) · 508 - 66 = 442 (B) · 1141 - 343 = 798 (A) · 1145 - 379 = 766 (H) · 709 - 209 = 500 (E)
- Clue 4 (Multiplication facts (1-12)): "WE FOUND BLUE ALGAE IN THE SAND"2 × 1 = 2 (W) · 10 × 10 = 100 (L) · 11 × 12 = 132 (O) · 9 × 9 = 81 (B) · 4 × 11 = 44 (N) · 12 × 7 = 84 (U) · 3 × 7 = 21 (G) · 7 × 10 = 70 (T) · 8 × 8 = 64 (F) · 8 × 12 = 96 (D) · 11 × 11 = 121 (E) · 7 × 4 = 28 (I) · 4 × 8 = 32 (S) · 7 × 7 = 49 (H) · 5 × 11 = 55 (A)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Pearl11 ÷ 11 = 1 · 50 ÷ 10 = 5 · 15 ÷ 5 = 3 · 42 ÷ 6 = 7 · 12 ÷ 3 = 4 · 2 ÷ 1 = 2 · 40 ÷ 4 = 10 · 9 ÷ 1 = 9 · 132 ÷ 12 = 11 · 24 ÷ 3 = 8 · 42 ÷ 7 = 6
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 1-2
- Theme
- The Case of the Lost Pearl Crown — set in The Sunny Cove
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects