🌊 Unicorns, MermaidsGrade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Case of the Missing Magic Pearl
Someone snatched the Great Magic Pearl from Coral Cove Lagoon! Help Detective Starfish solve the clues and save the day.
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 | Dominant Hand | Trait | Weakness |
|---|---|---|---|---|---|
| Amber Wave | Horn Flash | Seaweed Net | Right-handed | Pink Mane | Loud Whistles |
| Nova Splash | Bubble Blast | Glow Wand | Right-handed | Aqua Tail | Shiny Mirrors |
| Ruby Reef | Bubble Blast | Glow Wand | Right-handed | Pink Mane | Loud Whistles |
| Jasper Jewel | Horn Flash | Coral Lasso | Left-handed | Pink Mane | Loud Whistles |
| Coral Sky | Star Sparkle | Seaweed Net | Right-handed | Pink Mane | Shiny Mirrors |
| Cleo Coast | Bubble Blast | Shell Prism | Right-handed | Pink Mane | Loud Whistles |
| Finn Flash | Rainbow Wave | Shell Prism | Right-handed | Silver Curls | Loud Whistles |
| Bubbles Blue | Bubble Blast | Tide Whistle | Left-handed | Silver Curls | Shiny Mirrors |
| Piper Pebble | Rainbow Wave | Coral Lasso | Right-handed | Aqua Tail | Loud Whistles |
| Pearl Bright | Rainbow Wave | Glow Wand | Right-handed | Silver Curls | Loud Whistles |
| Orion Shell | Horn Flash | Seaweed Net | Right-handed | Silver Curls | Shiny Mirrors |
| Milo Marine | Horn Flash | Glow Wand | Left-handed | Pink Mane | Loud Whistles |
| Willow Water | Horn Flash | Shell Prism | Right-handed | Aqua Tail | Loud Whistles |
| Sparkle Fin | Star Sparkle | Coral Lasso | Left-handed | Aqua Tail | Shiny Mirrors |
| Glimmer Horn | Rainbow Wave | Seaweed Net | Left-handed | Aqua Tail | Loud Whistles |
| Sienna Sea | Rainbow Wave | Coral Lasso | Right-handed | Pink Mane | Loud Whistles |
| Crystal Tide | Horn Flash | Seaweed Net | Left-handed | Aqua Tail | Loud Whistles |
| Sunny Mane | Pearl Shield | Glow Wand | Right-handed | Pink Mane | Loud Whistles |
| Poppy Prism | Star Sparkle | Shell Prism | Right-handed | Pink Mane | Shiny Mirrors |
| Marina Star | Pearl Shield | Shell Prism | Left-handed | Aqua Tail | Loud Whistles |
| Skye Glitter | Bubble Blast | Tide Whistle | Right-handed | Pink Mane | Sweet Berries |
Clue 1
Place value
Detective Starfish counts the tens and ones blocks of power crystals to read 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
45
73
75
74
35
75
98
71
42
T
45
73
46
75
47
34
46
34
35
77
T
45
32
74
75
98
74
75
98
89
75
75
34
35
75
T
45
What number has 4 tens and 5 ones?T
What number has 7 tens and 7 ones?O
What number has 3 tens and 4 ones?D
What number has 9 tens and 8 ones?A
What number has 7 tens and 1 one?K
What number has 4 tens and 6 ones?I
What number has 7 tens and 3 ones?H
What number has 4 tens and 2 ones?Y
What number has 3 tens and 2 ones?U
What number has 4 tens and 7 ones?F
What number has 8 tens and 9 ones?W
What number has 7 tens and 4 ones?S
What number has 7 tens and 5 ones?E
What number has 3 tens and 5 ones?N
0/14 letters found
Clue 2
Addition
To open the lagoon gates, we must add together all the shiny shells found on the sand.
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
97
35
41
T
97
35
42
41
25
35
41
24
84
T
97
35
41
91
41
81
83
24
42
34
T
97
35
41
42
83
83
42
43
35
T
97
35
81
34
84
56 + 41 =T
23 + 12 =H
28 + 55 =R
44 + 47 =P
10 + 14 =L
38 + 43 =A
27 + 15 =I
16 + 27 =G
29 + 12 =E
11 + 23 =N
10 + 15 =F
43 + 41 =D
0/12 letters found
Clue 3
Subtraction
The thief left dark ink bubbles behind. Subtract the popped ones to reveal a secret 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.
A
64
46
79
87
73
22
52
41
12
84
46
74
12
50
A
64
75
74
73
84
52
74
84
52
41
74
48
A
64
22
A
64
42
67 - 3 =A
78 - 32 =L
44 - 3 =I
72 - 30 =Y
78 - 28 =C
90 - 11 =O
24 - 2 =W
81 - 29 =H
99 - 15 =T
79 - 6 =D
119 - 32 =U
23 - 11 =S
95 - 21 =E
81 - 33 =F
102 - 27 =R
0/15 letters found
Clue 4
Skip counting
We follow a trail of sparkling gems by skip counting by twos across the coral reef.
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
18
10
90
110
90
T
18
90
40
T
18
65
6
90
33
60
15
50
110
22
100
65
50
39
45
90
9
65
50
120
140
22
50
90
10
22
65
8
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140K
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50C
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25U
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120S
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110E
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12R
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15P
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39F
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10V
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75I
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26A
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160M
0/19 letters found
Clue 5
Missing addends — the last clue
The vault needs twelve sea crystals to open. Solve the missing addend to find the last hint.
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
9 + ___ = 11
7 + ___ = 17
1 + ___ = 2
1 + ___ = 4
5 + ___ = 10
6 + ___ = 12
10 + ___ = 14
10 + ___ = 22
8 + ___ = 17
7 + ___ = 18
8 + ___ = 15
Step 2 — cross out the sentence with each answer
1.The villain made a rainbow wave, then threw a coral lasso.
2.The villain raised a pearl shield, then waved a glow wand.
3.The villain made a rainbow wave, then blew a tide whistle.
4.The villain flashed a magic horn, then blew a tide whistle.
5.The villain shot a bubble blast, then threw a coral lasso.
6.The villain created a star sparkle, then threw a coral lasso.
7.The villain raised a pearl shield, then blew a tide whistle.
8.The villain shot a bubble blast, then shined a shell prism.
9.The villain raised a pearl shield, then cast a seaweed net.
10.The villain shot a bubble blast, then waved a glow wand.
11.The villain flashed a magic horn, then threw a coral lasso.
12.The villain created a star sparkle, then shined a shell prism.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Magic Pearl
Culprit: Cleo Coast (Bubble Blast · Shell Prism · Right-handed · Pink Mane · Loud Whistles)
- Clue 1 (Place value): "THE SNEAKY THIEF DID NOT USE A SEAWEED NET"What number has 4 tens and 5 ones? = 45 (T) · What number has 7 tens and 7 ones? = 77 (O) · What number has 3 tens and 4 ones? = 34 (D) · What number has 9 tens and 8 ones? = 98 (A) · What number has 7 tens and 1 one? = 71 (K) · What number has 4 tens and 6 ones? = 46 (I) · What number has 7 tens and 3 ones? = 73 (H) · What number has 4 tens and 2 ones? = 42 (Y) · What number has 3 tens and 2 ones? = 32 (U) · What number has 4 tens and 7 ones? = 47 (F) · What number has 8 tens and 9 ones? = 89 (W) · What number has 7 tens and 4 ones? = 74 (S) · What number has 7 tens and 5 ones? = 75 (E) · What number has 3 tens and 5 ones? = 35 (N)
- Clue 2 (Addition): "THE THIEF HELD THE PEARL IN THEIR RIGHT HAND"56 + 41 = 97 (T) · 23 + 12 = 35 (H) · 28 + 55 = 83 (R) · 44 + 47 = 91 (P) · 10 + 14 = 24 (L) · 38 + 43 = 81 (A) · 27 + 15 = 42 (I) · 16 + 27 = 43 (G) · 29 + 12 = 41 (E) · 11 + 23 = 34 (N) · 10 + 15 = 25 (F) · 43 + 41 = 84 (D)
- Clue 3 (Subtraction): "A LOUD WHISTLE SCARED THE THIEF AWAY"67 - 3 = 64 (A) · 78 - 32 = 46 (L) · 44 - 3 = 41 (I) · 72 - 30 = 42 (Y) · 78 - 28 = 50 (C) · 90 - 11 = 79 (O) · 24 - 2 = 22 (W) · 81 - 29 = 52 (H) · 99 - 15 = 84 (T) · 79 - 6 = 73 (D) · 119 - 32 = 87 (U) · 23 - 11 = 12 (S) · 95 - 21 = 74 (E) · 81 - 33 = 48 (F) · 102 - 27 = 75 (R)
- Clue 4 (Skip counting): "THE DETECTIVE FOUND A SINGLE PINK MANE HAIR"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (K) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (C) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (U) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (S) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (R) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (P) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (F) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (V) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (A) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (M)
- Clue 5 (Missing addends): surviving statement (box 8) → Cleo Coast9 + ___ = 11 = 2 · 7 + ___ = 17 = 10 · 1 + ___ = 2 = 1 · 1 + ___ = 4 = 3 · 5 + ___ = 10 = 5 · 6 + ___ = 12 = 6 · 10 + ___ = 14 = 4 · 10 + ___ = 22 = 12 · 8 + ___ = 17 = 9 · 7 + ___ = 18 = 11 · 8 + ___ = 15 = 7
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Case of the Missing Magic Pearl — set in Coral Cove Lagoon
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects