🌊 Mermaids, UnicornsGrade 5Reading: grades 5-6Fractions of a numberOrder of operationsMultiplicationRoundingDivision
The Mystery of the Coral Kingdom Pearl
The legendary Heart of the Sea Pearl has been stolen from the Coral Altar! Witnesses saw a mysterious figure flee toward the forest. Both mermaids and unicorns are suspects, and it is up to the Glitter Patrol to solve the case.
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 | Signature Spell | Enchanted Gear | Swim Pattern | Mane Texture | Magic Barrier |
|---|---|---|---|---|---|
| Stormy | Coral Shield | Shell Necklace | Leans Right | Seaweed Braids | Sweet Clover |
| Silvermane | Sparkle Spark | Kelpfrost Ring | Leans Right | Glitter Strands | Sunlight |
| Triton | Coral Shield | Starfish Wand | Leans Right | Starfish Clips | Sweet Clover |
| Starlight | Rainbow Dash | Kelpfrost Ring | Leans Right | Seaweed Braids | Sweet Clover |
| Celestia | Rainbow Dash | Pearl Tiara | Leans Right | Seaweed Braids | Sweet Clover |
| Delphine | Coral Shield | Pearl Tiara | Leans Left | Starfish Clips | Sunlight |
| Aqua | Tidal Wave | Pearl Tiara | Leans Right | Starfish Clips | Deep Trench |
| Coralia | Rainbow Dash | Shell Necklace | Leans Right | Seaweed Braids | Sweet Clover |
| Marina | Sparkle Spark | Starfish Wand | Leans Right | Seaweed Braids | Sweet Clover |
| Pearl | Coral Shield | Starfish Wand | Leans Right | Glitter Strands | Sweet Clover |
| Oceanus | Tidal Wave | Pearl Tiara | Leans Left | Glitter Strands | Sunlight |
| Glitterhoof | Sparkle Spark | Pearl Tiara | Leans Right | Starfish Clips | Deep Trench |
| Waveweaver | Sparkle Spark | Pearl Tiara | Leans Left | Seaweed Braids | Sunlight |
| Skye | Tidal Wave | Shell Necklace | Leans Left | Starfish Clips | Sunlight |
| Jewel | Coral Shield | Starfish Wand | Leans Left | Glitter Strands | Deep Trench |
| Melody | Sparkle Spark | Kelpfrost Ring | Leans Right | Seaweed Braids | Deep Trench |
| Splash | Bubble Beam | Kelpfrost Ring | Leans Left | Seaweed Braids | Sunlight |
| Starshine | Rainbow Dash | Shell Necklace | Leans Right | Starfish Clips | Deep Trench |
| Ariel | Rainbow Dash | Kelpfrost Ring | Leans Right | Glitter Strands | Deep Trench |
| Finley | Bubble Beam | Golden Bridle | Leans Right | Seaweed Braids | Sunlight |
| Neptune | Coral Shield | Starfish Wand | Leans Left | Seaweed Braids | Sweet Clover |
Clue 1
Fractions of a number
The Reef Guardians counted their stored glow-shells. They need to find what fraction of the shells are still shining to activate the tracking map.
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
15
23
18
T
15
23
11
18
12
38
25
18
31
9
25
T
15
10
18
2
21
T
15
23
18
29
18
2
21
33
T
15
11
2
21
2
5/10 of 30 =T
2/10 of 145 =P
6/10 of 35 =R
2/4 of 76 =D
3/6 of 36 =E
2/4 of 62 =S
1/8 of 80 =W
1/5 of 115 =H
4/8 of 66 =L
3/8 of 32 =F
2/10 of 10 =A
1/2 of 18 =N
4/8 of 50 =O
5/10 of 22 =I
0/14 letters found
Clue 2
Order of operations
To unlock the sea-chest containing the first clue, we must solve the sequence of bubble-math steps in the correct order.
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
79
11
57
47
71
47
40
57
75
T
79
21
55
68
21
62
47
47
68
67
49
47
T
79
27
68
21
9
73
T
79
11
57
9
67
23
11
T
79
9 × 11 - 20 =T
8 × 6 - 1 =S
3 × 12 - 25 =H
11 × 8 - 15 =D
5 + 6 × 3 =G
44 + 3 × 6 =Y
11 × 8 - 17 =U
10 × 7 - 3 =I
10 × 5 - 29 =A
25 + 5 × 3 =P
9 × 3 - 18 =R
9 + 2 × 9 =O
10 × 5 - 1 =M
9 × 7 - 8 =L
12 × 7 - 27 =E
27 + 6 × 8 =C
10 × 8 - 12 =W
0/17 letters found
Clue 3
Multiplication facts (1-12)
The kelp forest is planted in equal rows. Counting the total plants will help us map the thief's escape path.
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
70
81
44
44
48
44
11
28
10
5
63
44
121
12
121
16
121
10
48
5
T
70
5
63
44
44
T
70
50
99
15
22
44
72
7 × 10 =T
5 × 2 =I
2 × 8 =G
7 × 9 =W
5 × 1 =S
3 × 5 =O
6 × 8 =N
11 × 2 =V
10 × 5 =C
9 × 11 =L
11 × 11 =A
9 × 9 =H
4 × 7 =Y
1 × 11 =M
4 × 11 =E
9 × 8 =R
12 × 1 =K
0/17 letters found
Clue 4
Rounding
Our sea-sonar isn't perfectly precise. It rounds the distance of the suspect's magical trail to the nearest ten 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.
W
2300
130
7000
290
110
90
170
1300
50
130
130
90
1700
130
500
W
2300
130
130
170
1100
50
500
230
170
1700
Round 2,294 to the nearest hundredW
Round 126 to the nearest tenE
Round 502 to the nearest hundredA
Round 231 to the nearest tenI
Round 7,217 to the nearest thousandF
Round 1,327 to the nearest hundredG
Round 1,727 to the nearest hundredS
Round 1,056 to the nearest hundredB
Round 93 to the nearest tenN
Round 166 to the nearest tenD
Round 47 to the nearest tenR
Round 287 to the nearest tenO
Round 109 to the nearest tenU
0/13 letters found
Clue 5
Division facts (1-12) — the last clue
The mermaids need to divide their speed-potions equally among the search teams before they set off.
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
96 ÷ 8 = ?
108 ÷ 12 = ?
55 ÷ 11 = ?
2 ÷ 1 = ?
70 ÷ 7 = ?
40 ÷ 5 = ?
99 ÷ 9 = ?
28 ÷ 4 = ?
3 ÷ 1 = ?
48 ÷ 12 = ?
30 ÷ 5 = ?
Step 2 — cross out the sentence with each answer
1.The villain summons a blinding flash of light, then leaps over the coral reef.
2.The villain conjures a wall of sharp coral, then vanishes in a cloud of bubbles.
3.The villain creates a massive whirlpool, then gallops away into the deep forest.
4.The villain conjures a wall of sharp coral, then gallops away into the deep forest.
5.The villain kicks up a blinding sandstorm, then gallops away into the deep forest.
6.The villain shoots a stream of hot steam, then gallops away into the deep forest.
7.The villain creates a massive whirlpool, then vanishes in a cloud of bubbles.
8.The villain kicks up a blinding sandstorm, then leaps over the coral reef.
9.The villain summons a blinding flash of light, then gallops away into the deep forest.
10.The villain shoots a stream of hot steam, then disappears into a deep trench.
11.The villain summons a blinding flash of light, then vanishes in a cloud of bubbles.
12.The villain shoots a stream of hot steam, then vanishes in a cloud of bubbles.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Coral Kingdom Pearl
Culprit: Starlight (Rainbow Dash · Kelpfrost Ring · Leans Right · Seaweed Braids · Sweet Clover)
- Clue 1 (Fractions of a number): "THE THIEF DOES NOT WEAR THE PEARL TIARA"5/10 of 30 = 15 (T) · 2/10 of 145 = 29 (P) · 6/10 of 35 = 21 (R) · 2/4 of 76 = 38 (D) · 3/6 of 36 = 18 (E) · 2/4 of 62 = 31 (S) · 1/8 of 80 = 10 (W) · 1/5 of 115 = 23 (H) · 4/8 of 66 = 33 (L) · 3/8 of 32 = 12 (F) · 2/10 of 10 = 2 (A) · 1/2 of 18 = 9 (N) · 4/8 of 50 = 25 (O) · 5/10 of 22 = 11 (I)
- Clue 2 (Order of operations): "THE SUSPECT ALWAYS SWIMS TOWARD THE RIGHT"9 × 11 - 20 = 79 (T) · 8 × 6 - 1 = 47 (S) · 3 × 12 - 25 = 11 (H) · 11 × 8 - 15 = 73 (D) · 5 + 6 × 3 = 23 (G) · 44 + 3 × 6 = 62 (Y) · 11 × 8 - 17 = 71 (U) · 10 × 7 - 3 = 67 (I) · 10 × 5 - 29 = 21 (A) · 25 + 5 × 3 = 40 (P) · 9 × 3 - 18 = 9 (R) · 9 + 2 × 9 = 27 (O) · 10 × 5 - 1 = 49 (M) · 9 × 7 - 8 = 55 (L) · 12 × 7 - 27 = 57 (E) · 27 + 6 × 8 = 75 (C) · 10 × 8 - 12 = 68 (W)
- Clue 3 (Multiplication facts (1-12)): "THE ENEMY IS WEAK AGAINST SWEET CLOVER"7 × 10 = 70 (T) · 5 × 2 = 10 (I) · 2 × 8 = 16 (G) · 7 × 9 = 63 (W) · 5 × 1 = 5 (S) · 3 × 5 = 15 (O) · 6 × 8 = 48 (N) · 11 × 2 = 22 (V) · 10 × 5 = 50 (C) · 9 × 11 = 99 (L) · 11 × 11 = 121 (A) · 9 × 9 = 81 (H) · 4 × 7 = 28 (Y) · 1 × 11 = 11 (M) · 4 × 11 = 44 (E) · 9 × 8 = 72 (R) · 12 × 1 = 12 (K)
- Clue 4 (Rounding): "WE FOUND GREEN SEAWEED BRAIDS"Round 2,294 to the nearest hundred = 2300 (W) · Round 126 to the nearest ten = 130 (E) · Round 502 to the nearest hundred = 500 (A) · Round 231 to the nearest ten = 230 (I) · Round 7,217 to the nearest thousand = 7000 (F) · Round 1,327 to the nearest hundred = 1300 (G) · Round 1,727 to the nearest hundred = 1700 (S) · Round 1,056 to the nearest hundred = 1100 (B) · Round 93 to the nearest ten = 90 (N) · Round 166 to the nearest ten = 170 (D) · Round 47 to the nearest ten = 50 (R) · Round 287 to the nearest ten = 290 (O) · Round 109 to the nearest ten = 110 (U)
- Clue 5 (Division facts (1-12)): surviving statement (box 1) → Starlight96 ÷ 8 = 12 · 108 ÷ 12 = 9 · 55 ÷ 11 = 5 · 2 ÷ 1 = 2 · 70 ÷ 7 = 10 · 40 ÷ 5 = 8 · 99 ÷ 9 = 11 · 28 ÷ 4 = 7 · 3 ÷ 1 = 3 · 48 ÷ 12 = 4 · 30 ÷ 5 = 6
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Fractions of a number, Order of operations, Multiplication, Rounding, Division
- Reading level
- grades 5-6
- Theme
- The Mystery of the Coral Kingdom Pearl — set in The Aquamarine Reef and the Glittering Coast
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects