🌊 MermaidsGrade 3Reading: grades 3-4MultiplicationRoundingAdditionSubtractionDivision
The Mystery of the Great Glow Pearl
Someone swam into the Royal Pearl Vault and snatched the Great Glow Pearl! The deep ocean is in total darkness without it. The Coral Cove Guard needs your help to track down the sneaky sea 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 | Main Power | Extra Power | Swimmer Tell | Hair Color | Weakness |
|---|---|---|---|---|---|
| Madison | kelp wrapping | glow light | right handed swimmer | bright pink hair | tickle feathers |
| Arista | coral growth | ink cloud | right handed swimmer | seaweed green hair | sour lemon kelp |
| Tallulah | coral growth | ink cloud | left handed swimmer | bright pink hair | sour lemon kelp |
| Alana | coral growth | tide sweep | left handed swimmer | seaweed green hair | tickle feathers |
| Aquata | bubble shield | ink cloud | left handed swimmer | deep blue hair | bright sunlight |
| Delphine | kelp wrapping | tide sweep | left handed swimmer | bright pink hair | tickle feathers |
| Chelsea | wave control | fast swim | left handed swimmer | deep blue hair | bright sunlight |
| Adella | wave control | sonar ping | right handed swimmer | deep blue hair | bright sunlight |
| Pearl | coral growth | fast swim | right handed swimmer | bright pink hair | sour lemon kelp |
| Naida | bubble shield | ink cloud | left handed swimmer | bright pink hair | sour lemon kelp |
| Coral | whale calling | ink cloud | right handed swimmer | bright pink hair | sour lemon kelp |
| Kailani | kelp wrapping | ink cloud | right handed swimmer | seaweed green hair | tickle feathers |
| Sirena | bubble shield | ink cloud | right handed swimmer | deep blue hair | bright sunlight |
| Nerida | whale calling | ink cloud | right handed swimmer | deep blue hair | tickle feathers |
| Andrina | wave control | glow light | right handed swimmer | seaweed green hair | tickle feathers |
| Melody | whale calling | fast swim | left handed swimmer | deep blue hair | tickle feathers |
| Marina | kelp wrapping | sonar ping | right handed swimmer | bright pink hair | sour lemon kelp |
| Waverly | coral growth | tide sweep | right handed swimmer | bright pink hair | sour lemon kelp |
| Nixie | bubble shield | sonar ping | right handed swimmer | deep blue hair | sour lemon kelp |
| Attina | bubble shield | glow light | left handed swimmer | bright pink hair | sour lemon kelp |
| Syrena | bubble shield | sonar ping | right handed swimmer | bright pink hair | sour lemon kelp |
Clue 1
Multiplication facts (1-12)
The Coral Cove guards counted rows of sea clams outside the vault to find clues. If each row has the same number of shells, let's multiply to find the total!
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
88
2
27
T
88
2
80
27
100
77
24
27
5
90
24
T
88
21
5
27
T
88
2
27
100
36
5
T
88
5
22
80
56
28
24
22
27
25
11 × 8 =T
10 × 9 =N
5 × 5 =R
4 × 7 =P
4 × 9 =A
11 × 7 =D
8 × 10 =I
10 × 10 =F
7 × 3 =U
1 × 2 =H
9 × 3 =E
7 × 8 =M
8 × 3 =O
11 × 2 =W
1 × 5 =S
0/15 letters found
Clue 2
Rounding
The sonar radar screen was too fuzzy to show the exact distance. We must round the numbers to the nearest ten to see where the suspect went.
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
6000
20
30
900
50
900
300
30
40
T
6000
900
700
800
80
700
4000
T
6000
20
T
6000
20
30
4000
90
90
4000
60
20
T
6000
20
800
500
8000
7000
4000
90
900
T
6000
Round 5,580 to the nearest thousandT
Round 807 to the nearest hundredA
Round 535 to the nearest hundredN
Round 59 to the nearest tenG
Round 34 to the nearest tenE
Round 47 to the nearest tenU
Round 80 to the nearest tenM
Round 324 to the nearest hundredP
Round 88 to the nearest tenR
Round 20 to the nearest tenH
Round 726 to the nearest hundredW
Round 40 to the nearest tenC
Round 8,014 to the nearest thousandD
Round 869 to the nearest hundredS
Round 3,525 to the nearest thousandI
Round 6,958 to the nearest thousandF
0/16 letters found
Clue 3
Addition
We found two piles of dropped ocean gems near the reef. Add them together to see how many the thief dropped in total.
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
966
384
570
613
586
384
298
590
570
220
570
432
293
T
966
T
966
384
570
586
303
783
220
366
570
550
303
730
204
570
366
333
360 + 606 =T
176 + 256 =D
265 + 518 =U
109 + 95 =K
215 + 371 =S
95 + 208 =O
485 + 245 =N
207 + 363 =E
169 + 215 =H
227 + 363 =V
129 + 169 =I
423 + 190 =Y
381 + 169 =M
188 + 145 =P
90 + 203 =A
149 + 217 =L
78 + 142 =R
0/17 letters found
Clue 4
Subtraction
The thief took many pearls but dropped some while escaping. Let's subtract the dropped ones to see how many they have left.
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
853
796
216
621
461
389
345
105
216
791
461
850
753
134
705
118
345
441
796
T
853
621
345
753
564
796
351
345
118
540
T
853
118
351
753
134
540
1141 - 288 =T
693 - 232 =O
815 - 251 =K
966 - 213 =N
439 - 321 =R
475 - 130 =I
943 - 93 =U
485 - 269 =E
808 - 367 =G
236 - 102 =D
890 - 99 =F
831 - 291 =S
737 - 116 =P
814 - 109 =B
571 - 220 =A
113 - 8 =C
845 - 49 =H
730 - 341 =L
0/18 letters found
Clue 5
Division facts (1-12) — the last clue
We need to share our search supplies equally among the rescue dolphins. Divide the fish treats so every dolphin gets a fair share.
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
10 ÷ 5 = ?
9 ÷ 9 = ?
80 ÷ 10 = ?
81 ÷ 9 = ?
35 ÷ 5 = ?
8 ÷ 2 = ?
96 ÷ 8 = ?
27 ÷ 9 = ?
48 ÷ 8 = ?
10 ÷ 2 = ?
55 ÷ 5 = ?
Step 2 — cross out the sentence with each answer
1.The villain summoned a pod using whale calling, then blinded the pursuers with an ink cloud.
2.The villain blocked the vault with a bubble shield, then located the exit using a sonar ping.
3.The villain blocked the vault with a bubble shield, then blinded the pursuers with an ink cloud.
4.The villain pushed the guards back with wave control, then located the exit using a sonar ping.
5.The villain trapped the gates with kelp wrapping, then zoomed away using a fast swim.
6.The villain grew sharp branches of coral growth, then lit up the dark tunnel with a glow light.
7.The villain trapped the gates with kelp wrapping, then washed away clues with a tide sweep.
8.The villain grew sharp branches of coral growth, then washed away clues with a tide sweep.
9.The villain blocked the vault with a bubble shield, then lit up the dark tunnel with a glow light.
10.The villain trapped the gates with kelp wrapping, then located the exit using a sonar ping.
11.The villain pushed the guards back with wave control, then blinded the pursuers with an ink cloud.
12.The villain summoned a pod using whale calling, then washed away clues with a tide sweep.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Great Glow Pearl
Culprit: Marina (kelp wrapping · sonar ping · right handed swimmer · bright pink hair · sour lemon kelp)
- Clue 1 (Multiplication facts (1-12)): "THE THIEF DOES NOT USE THE FAST SWIM POWER"11 × 8 = 88 (T) · 10 × 9 = 90 (N) · 5 × 5 = 25 (R) · 4 × 7 = 28 (P) · 4 × 9 = 36 (A) · 11 × 7 = 77 (D) · 8 × 10 = 80 (I) · 10 × 10 = 100 (F) · 7 × 3 = 21 (U) · 1 × 2 = 2 (H) · 9 × 3 = 27 (E) · 7 × 8 = 56 (M) · 8 × 3 = 24 (O) · 11 × 2 = 22 (W) · 1 × 5 = 5 (S)
- Clue 2 (Rounding): "THE SUSPECT SWAM WITH THEIR RIGHT HAND FIRST"Round 5,580 to the nearest thousand = 6000 (T) · Round 807 to the nearest hundred = 800 (A) · Round 535 to the nearest hundred = 500 (N) · Round 59 to the nearest ten = 60 (G) · Round 34 to the nearest ten = 30 (E) · Round 47 to the nearest ten = 50 (U) · Round 80 to the nearest ten = 80 (M) · Round 324 to the nearest hundred = 300 (P) · Round 88 to the nearest ten = 90 (R) · Round 20 to the nearest ten = 20 (H) · Round 726 to the nearest hundred = 700 (W) · Round 40 to the nearest ten = 40 (C) · Round 8,014 to the nearest thousand = 8000 (D) · Round 869 to the nearest hundred = 900 (S) · Round 3,525 to the nearest thousand = 4000 (I) · Round 6,958 to the nearest thousand = 7000 (F)
- Clue 3 (Addition): "THEY SHIVERED AT THE SOUR LEMON KELP"360 + 606 = 966 (T) · 176 + 256 = 432 (D) · 265 + 518 = 783 (U) · 109 + 95 = 204 (K) · 215 + 371 = 586 (S) · 95 + 208 = 303 (O) · 485 + 245 = 730 (N) · 207 + 363 = 570 (E) · 169 + 215 = 384 (H) · 227 + 363 = 590 (V) · 129 + 169 = 298 (I) · 423 + 190 = 613 (Y) · 381 + 169 = 550 (M) · 188 + 145 = 333 (P) · 90 + 203 = 293 (A) · 149 + 217 = 366 (L) · 78 + 142 = 220 (R)
- Clue 4 (Subtraction): "THE POLICE FOUND BRIGHT PINK HAIR STRANDS"1141 - 288 = 853 (T) · 693 - 232 = 461 (O) · 815 - 251 = 564 (K) · 966 - 213 = 753 (N) · 439 - 321 = 118 (R) · 475 - 130 = 345 (I) · 943 - 93 = 850 (U) · 485 - 269 = 216 (E) · 808 - 367 = 441 (G) · 236 - 102 = 134 (D) · 890 - 99 = 791 (F) · 831 - 291 = 540 (S) · 737 - 116 = 621 (P) · 814 - 109 = 705 (B) · 571 - 220 = 351 (A) · 113 - 8 = 105 (C) · 845 - 49 = 796 (H) · 730 - 341 = 389 (L)
- Clue 5 (Division facts (1-12)): surviving statement (box 10) → Marina10 ÷ 5 = 2 · 9 ÷ 9 = 1 · 80 ÷ 10 = 8 · 81 ÷ 9 = 9 · 35 ÷ 5 = 7 · 8 ÷ 2 = 4 · 96 ÷ 8 = 12 · 27 ÷ 9 = 3 · 48 ÷ 8 = 6 · 10 ÷ 2 = 5 · 55 ÷ 5 = 11
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Multiplication, Rounding, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Great Glow Pearl — set in Coral Cove Castle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects