🏴☠️ Unicorns, Mermaids, PiratesGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Mystery of Coral Cloud Cove
Someone stole the Glitter Crown from Captain Pearly! Was it a mermaid, a pirate, or a magic unicorn? Follow the clues to 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 | Magic Skill | Sea Treasure | Habit | Mane Color | Scared Of |
|---|---|---|---|---|---|
| Captain Wave | Rainbow Sparkles | Conch Shell | Right Handed | Blue Hair | Shiny Mirrors |
| Glitter | Wave Splashing | Silver Key | Right Handed | Gold Hair | Loud Whistles |
| Sandy | Star Singing | Pearl Map | Right Handed | Pink Hair | Shiny Mirrors |
| Coralie | Horn Glowing | Crystal Compass | Left Handed | Blue Hair | Loud Whistles |
| Ocean | Wave Splashing | Conch Shell | Left Handed | Gold Hair | Shiny Mirrors |
| Barnacle | Rainbow Sparkles | Pearl Map | Right Handed | Gold Hair | Loud Whistles |
| Captain Hook | Bubble Flying | Pearl Map | Left Handed | Gold Hair | Loud Whistles |
| Jewel | Horn Glowing | Crystal Compass | Left Handed | Pink Hair | Shiny Mirrors |
| Marina | Rainbow Sparkles | Pearl Map | Left Handed | Blue Hair | Loud Whistles |
| Pearl | Star Singing | Conch Shell | Left Handed | Pink Hair | Loud Whistles |
| Captain Coral | Bubble Flying | Crystal Compass | Right Handed | Gold Hair | Loud Whistles |
| Twinkle | Horn Glowing | Crystal Compass | Left Handed | Gold Hair | Loud Whistles |
| Skylar | Rainbow Sparkles | Conch Shell | Right Handed | Gold Hair | Loud Whistles |
| Anchor | Bubble Flying | Golden Anchor | Right Handed | Pink Hair | Sweet Berries |
| Star sparkle | Bubble Flying | Conch Shell | Right Handed | Blue Hair | Shiny Mirrors |
| Finny | Wave Splashing | Conch Shell | Right Handed | Gold Hair | Sweet Berries |
| Bubbles | Rainbow Sparkles | Pearl Map | Right Handed | Gold Hair | Shiny Mirrors |
| Shelly | Wave Splashing | Golden Anchor | Right Handed | Gold Hair | Loud Whistles |
| Misty | Horn Glowing | Pearl Map | Right Handed | Blue Hair | Loud Whistles |
| Swirly | Star Singing | Golden Anchor | Left Handed | Pink Hair | Loud Whistles |
| Breeze | Horn Glowing | Pearl Map | Left Handed | Gold Hair | Loud Whistles |
Clue 1
Addition
Captain Pearly counted the shiny shells found on deck to find the first secret.
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
14
3
20
T
14
3
12
20
9
6
17
20
18
7
17
T
14
3
2
13
20
2
15
17
19
6
20
7
2
7
10
3
17
4
10 + 4 =T
5 + 1 =D
2 + 5 =N
8 + 4 =I
7 + 2 =F
8 + 12 =E
1 + 1 =A
9 + 9 =S
7 + 12 =L
7 + 10 =O
8 + 5 =V
1 + 3 =R
7 + 3 =C
1 + 2 =H
6 + 9 =G
0/15 letters found
Clue 2
Subtraction
Marina took away the cracked pearls to reveal a hidden note.
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
3
16
6
19
18
T
3
1
6
10
10
10
14
19
14
8
18
13
16
T
3
16
14
1
7
6
7
T
3
16
18
6
12
6 - 3 =T
15 - 2 =G
19 - 1 =I
9 - 8 =N
16 - 9 =D
14 - 8 =E
10 - 2 =R
17 - 3 =A
19 - 3 =H
17 - 5 =F
18 - 8 =S
20 - 1 =W
0/12 letters found
Clue 3
Skip counting
Swirly counted sea stars by twos along the sandy beach.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
L
130
30
12
110
36
60
40
15
100
L
130
55
15
39
16
110
55
100
60
55
100
60
40
55
20
22
12
9
16
36
16
21
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27Y
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16U
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26R
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42W
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130D
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45M
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65E
0/16 letters found
Clue 4
Place value
Finny grouped the magic crystals into tens and ones to read a sign.
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
74
25
27
58
70
11
77
63
87
21
19
11
77
58
87
87
14
25
77
63
94
77
21
14
63
45
11
21
63
19
What number has 7 tens and 4 ones?G
What number has 2 tens and 7 ones?L
What number has 5 tens and 8 ones?D
What number has 2 tens and 5 ones?O
What number has 1 ten and 1 one?A
What number has 6 tens and 3 ones?E
What number has 7 tens and 7 ones?N
What number has 2 tens and 1 one?T
What number has 1 ten and 4 ones?H
What number has 9 tens and 4 ones?I
What number has 1 ten and 9 ones?R
What number has 8 tens and 7 ones?S
What number has 7 tens and 0 ones?M
What number has 4 tens and 5 ones?W
0/14 letters found
Clue 5
Missing addends — the last clue
Barnaby figured out how many missing gems were needed to open the chest.
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
2 + ___ = 5
1 + ___ = 11
9 + ___ = 21
9 + ___ = 11
7 + ___ = 8
2 + ___ = 9
4 + ___ = 9
1 + ___ = 9
10 + ___ = 14
10 + ___ = 21
8 + ___ = 14
Step 2 — cross out the sentence with each answer
1.The villain makes their horn glow, then unlocks the silver key.
2.The villain sings a star song, then grabs the pearl map.
3.The villain flies in a giant bubble, then looks at the crystal compass.
4.The villain makes their horn glow, then takes the conch shell.
5.The villain makes big wave splashes, then takes the conch shell.
6.The villain sings a star song, then drops the golden anchor.
7.The villain sings a star song, then unlocks the silver key.
8.The villain makes big wave splashes, then grabs the pearl map.
9.The villain shoots rainbow sparkles, then grabs the pearl map.
10.The villain shoots rainbow sparkles, then takes the conch shell.
11.The villain shoots rainbow sparkles, then unlocks the silver key.
12.The villain makes big wave splashes, then unlocks the silver key.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of Coral Cloud Cove
Culprit: Barnacle (Rainbow Sparkles · Pearl Map · Right Handed · Gold Hair · Loud Whistles)
- Clue 1 (Addition): "THE THIEF DOES NOT HAVE A GOLDEN ANCHOR"10 + 4 = 14 (T) · 5 + 1 = 6 (D) · 2 + 5 = 7 (N) · 8 + 4 = 12 (I) · 7 + 2 = 9 (F) · 8 + 12 = 20 (E) · 1 + 1 = 2 (A) · 9 + 9 = 18 (S) · 7 + 12 = 19 (L) · 7 + 10 = 17 (O) · 8 + 5 = 13 (V) · 1 + 3 = 4 (R) · 7 + 3 = 10 (C) · 1 + 2 = 3 (H) · 6 + 9 = 15 (G)
- Clue 2 (Subtraction): "THE WITNESS SAW A RIGHT HANDED THIEF"6 - 3 = 3 (T) · 15 - 2 = 13 (G) · 19 - 1 = 18 (I) · 9 - 8 = 1 (N) · 16 - 9 = 7 (D) · 14 - 8 = 6 (E) · 10 - 2 = 8 (R) · 17 - 3 = 14 (A) · 19 - 3 = 16 (H) · 17 - 5 = 12 (F) · 18 - 8 = 10 (S) · 20 - 1 = 19 (W)
- Clue 3 (Skip counting): "LOUD WHISTLES MADE THE THIEF RUN AWAY"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (Y) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (U) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (R) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (W) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (D) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (A) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (M) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (E)
- Clue 4 (Place value): "GOLD MANE STRANDS SHONE IN THE WATER"What number has 7 tens and 4 ones? = 74 (G) · What number has 2 tens and 7 ones? = 27 (L) · What number has 5 tens and 8 ones? = 58 (D) · What number has 2 tens and 5 ones? = 25 (O) · What number has 1 ten and 1 one? = 11 (A) · What number has 6 tens and 3 ones? = 63 (E) · What number has 7 tens and 7 ones? = 77 (N) · What number has 2 tens and 1 one? = 21 (T) · What number has 1 ten and 4 ones? = 14 (H) · What number has 9 tens and 4 ones? = 94 (I) · What number has 1 ten and 9 ones? = 19 (R) · What number has 8 tens and 7 ones? = 87 (S) · What number has 7 tens and 0 ones? = 70 (M) · What number has 4 tens and 5 ones? = 45 (W)
- Clue 5 (Missing addends): surviving statement (box 9) → Barnacle2 + ___ = 5 = 3 · 1 + ___ = 11 = 10 · 9 + ___ = 21 = 12 · 9 + ___ = 11 = 2 · 7 + ___ = 8 = 1 · 2 + ___ = 9 = 7 · 4 + ___ = 9 = 5 · 1 + ___ = 9 = 8 · 10 + ___ = 14 = 4 · 10 + ___ = 21 = 11 · 8 + ___ = 14 = 6
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Skip counting, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Mystery of Coral Cloud Cove — set in Coral Cloud Cove
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects