🌊 Cats, MermaidsGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Great Pearl Mystery of Mew-Lantis
A sneaky purr-maid has taken the Golden Catnip Pearl from Mew-Lantis! We need to find the thief before they swim away. Let us solve the clues!
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 | Special Skill | Visible Sign | Hair Color | Sore Spot |
|---|---|---|---|---|---|
| Daisy | Tidal Bubble | Pearl Glow | wears a pearl collar | blue coral hair | scared of bright lights |
| Oscar | Shell Shield | Pearl Glow | wears a shiny crown | pink seaweed hair | scared of bright lights |
| Sammy | Wave Sing | Catnip Blast | wears a pearl collar | blue coral hair | scared of bright lights |
| Bella | Shell Shield | Catnip Blast | wears a shiny crown | gold kelp hair | scared of bright lights |
| Misty | Kelp Tangler | Pearl Glow | wears a shiny crown | blue coral hair | scared of loud songs |
| Pearl | Tidal Bubble | Sand Kick | wears a pearl collar | blue coral hair | scared of bright lights |
| Milo | Tidal Bubble | Sand Kick | wears a pearl collar | gold kelp hair | scared of loud songs |
| Coral | Tidal Bubble | Bubble Net | wears a shiny crown | blue coral hair | scared of bright lights |
| Sandy | Shell Shield | Pearl Glow | wears a pearl collar | pink seaweed hair | scared of bright lights |
| Ziggy | Coral Dash | Bubble Net | wears a pearl collar | blue coral hair | scared of bright lights |
| Marina | Coral Dash | Pearl Glow | wears a pearl collar | blue coral hair | scared of bright lights |
| Ollie | Kelp Tangler | Fish Call | wears a pearl collar | gold kelp hair | scared of cold water |
| Cookie | Shell Shield | Catnip Blast | wears a pearl collar | blue coral hair | scared of cold water |
| Whisker | Coral Dash | Pearl Glow | wears a pearl collar | blue coral hair | scared of loud songs |
| Toby | Coral Dash | Fish Call | wears a shiny crown | gold kelp hair | scared of loud songs |
| Finny | Shell Shield | Sand Kick | wears a shiny crown | gold kelp hair | scared of loud songs |
| Splash | Shell Shield | Catnip Blast | wears a shiny crown | pink seaweed hair | scared of loud songs |
| Pippin | Wave Sing | Pearl Glow | wears a pearl collar | blue coral hair | scared of cold water |
| Flounder | Tidal Bubble | Bubble Net | wears a pearl collar | gold kelp hair | scared of bright lights |
| Cleo | Wave Sing | Bubble Net | wears a pearl collar | blue coral hair | scared of bright lights |
| Shelly | Coral Dash | Sand Kick | wears a shiny crown | blue coral hair | scared of bright lights |
Clue 1
Addition
We count the starfish helpers to search the reef. Let us add them up to find our 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
18
11
12
T
18
11
19
12
8
15
7
12
14
20
7
T
18
17
14
12
3
17
3
3
16
12
20
12
T
18
8 + 10 =T
10 + 7 =U
5 + 2 =O
9 + 11 =N
5 + 7 =E
10 + 6 =L
6 + 2 =F
9 + 6 =D
5 + 6 =H
2 + 1 =B
10 + 4 =S
12 + 7 =I
0/12 letters found
Clue 2
Subtraction
A crab dropped some of his shiny shells while running. Subtract the lost ones to find a 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
18
4
11
3
2
11
14
16
13
T
18
4
15
11
6
8
11
14
12
3
14
5
11
14
12
10
19
1
10
10
14
12
19 - 1 =T
8 - 7 =O
8 - 6 =N
18 - 2 =K
15 - 7 =W
20 - 1 =C
10 - 5 =P
19 - 7 =R
7 - 3 =H
10 - 4 =F
10 - 7 =S
13 - 2 =E
17 - 7 =L
19 - 6 =Y
17 - 2 =I
18 - 4 =A
0/16 letters found
Clue 3
Skip counting
Look at the bubble rows rising from the sand. Skip count by fives to read the secret bubble 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
14
18
16
T
14
18
9
16
28
9
42
42
35
130
100
16
120
40
28
25
100
9
12
18
T
14
55
9
12
18
T
14
42
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45C
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32F
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120R
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18G
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15I
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35B
0/14 letters found
Clue 4
Place value
We find kelp strings packed in bundles of ten and some single ones. Group them to open the sea chest.
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
62
91
74
42
33
51
27
56
99
33
91
31
42
82
96
99
76
96
70
82
96
23
23
76
91
35
31
91
51
91
What number has 6 tens and 2 ones?W
What number has 5 tens and 6 ones?B
What number has 3 tens and 5 ones?S
What number has 3 tens and 3 ones?U
What number has 5 tens and 1 one?N
What number has 3 tens and 1 one?C
What number has 9 tens and 1 one?E
What number has 7 tens and 4 ones?F
What number has 7 tens and 6 ones?H
What number has 9 tens and 9 ones?L
What number has 9 tens and 6 ones?A
What number has 7 tens and 0 ones?I
What number has 2 tens and 3 ones?T
What number has 4 tens and 2 ones?O
What number has 8 tens and 2 ones?R
What number has 2 tens and 7 ones?D
0/16 letters found
Clue 5
Missing addends — the last clue
The shell box should have ten pearls but some are missing. Find the missing number to unlock the gate.
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 + ___ = 14
5 + ___ = 14
3 + ___ = 7
9 + ___ = 12
9 + ___ = 20
4 + ___ = 10
10 + ___ = 11
3 + ___ = 8
2 + ___ = 9
3 + ___ = 5
5 + ___ = 15
Step 2 — cross out the sentence with each answer
1.The villain raises a shell shield, then fires a catnip blast.
2.The villain sings a wave song, then throws a bubble net.
3.The villain sings a wave song, then makes a fish call.
4.The villain does a coral dash, then starts a pearl glow.
5.The villain tosses a kelp tangler, then starts a pearl glow.
6.The villain tosses a kelp tangler, then throws a bubble net.
7.The villain sings a wave song, then does a quick sand kick.
8.The villain sings a wave song, then fires a catnip blast.
9.The villain creates a tidal bubble, then does a quick sand kick.
10.The villain creates a tidal bubble, then fires a catnip blast.
11.The villain creates a tidal bubble, then makes a fish call.
12.The villain creates a tidal bubble, then starts a pearl glow.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Pearl Mystery of Mew-Lantis
Culprit: Sammy (Wave Sing · Catnip Blast · wears a pearl collar · blue coral hair · scared of bright lights)
- Clue 1 (Addition): "THE THIEF DOES NOT USE BUBBLE NET"8 + 10 = 18 (T) · 10 + 7 = 17 (U) · 5 + 2 = 7 (O) · 9 + 11 = 20 (N) · 5 + 7 = 12 (E) · 10 + 6 = 16 (L) · 6 + 2 = 8 (F) · 9 + 6 = 15 (D) · 5 + 6 = 11 (H) · 2 + 1 = 3 (B) · 10 + 4 = 14 (S) · 12 + 7 = 19 (I)
- Clue 2 (Subtraction): "THE SNEAKY THIEF WEARS A PEARL COLLAR"19 - 1 = 18 (T) · 8 - 7 = 1 (O) · 8 - 6 = 2 (N) · 18 - 2 = 16 (K) · 15 - 7 = 8 (W) · 20 - 1 = 19 (C) · 10 - 5 = 5 (P) · 19 - 7 = 12 (R) · 7 - 3 = 4 (H) · 10 - 4 = 6 (F) · 10 - 7 = 3 (S) · 13 - 2 = 11 (E) · 17 - 7 = 10 (L) · 19 - 6 = 13 (Y) · 17 - 2 = 15 (I) · 18 - 4 = 14 (A)
- Clue 3 (Skip counting): "THE THIEF IS SCARED OF BRIGHT LIGHTS"Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (C) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (G) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (B)
- Clue 4 (Place value): "WE FOUND BLUE CORAL HAIR AT THE SCENE"What number has 6 tens and 2 ones? = 62 (W) · What number has 5 tens and 6 ones? = 56 (B) · What number has 3 tens and 5 ones? = 35 (S) · What number has 3 tens and 3 ones? = 33 (U) · What number has 5 tens and 1 one? = 51 (N) · What number has 3 tens and 1 one? = 31 (C) · What number has 9 tens and 1 one? = 91 (E) · What number has 7 tens and 4 ones? = 74 (F) · What number has 7 tens and 6 ones? = 76 (H) · What number has 9 tens and 9 ones? = 99 (L) · What number has 9 tens and 6 ones? = 96 (A) · What number has 7 tens and 0 ones? = 70 (I) · What number has 2 tens and 3 ones? = 23 (T) · What number has 4 tens and 2 ones? = 42 (O) · What number has 8 tens and 2 ones? = 82 (R) · What number has 2 tens and 7 ones? = 27 (D)
- Clue 5 (Missing addends): surviving statement (box 8) → Sammy2 + ___ = 14 = 12 · 5 + ___ = 14 = 9 · 3 + ___ = 7 = 4 · 9 + ___ = 12 = 3 · 9 + ___ = 20 = 11 · 4 + ___ = 10 = 6 · 10 + ___ = 11 = 1 · 3 + ___ = 8 = 5 · 2 + ___ = 9 = 7 · 3 + ___ = 5 = 2 · 5 + ___ = 15 = 10
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 Great Pearl Mystery of Mew-Lantis — set in Mew-Lantis
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects