🌊 Mermaids, Cats, UnicornsGrade 2Reading: grades 1-2AdditionWord problemsSkip countingPlace valueMissing addends
The Case of the Missing Rainbow Pearl
Someone snuck into the underwater castle and snatched the glowing Rainbow Pearl! Help the Purr Guard decode the clues and find the sneaky culprit.
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 Gem | Purr Gadget | Paw Style | Mane Color | Silly Weakness |
|---|---|---|---|---|---|
| Jasper Jewel | Star Gem | Yarn Blaster | Left Paws | Silver Hair | Cold Water |
| Glimmer Grace | Shell Flute | Glow Collar | Left Paws | Gold Hair | Bright Light |
| Rainbow Reef | Bubble Staff | Glow Collar | Left Paws | Gold Hair | Bright Light |
| Bubbles McPurr | Rainbow Orb | Fish Bell | Right Paws | Pink Hair | Loud Music |
| Splashy Star | Bubble Staff | Glow Collar | Left Paws | Pink Hair | Cold Water |
| Captain Tabby | Bubble Staff | Glow Collar | Right Paws | Silver Hair | Loud Music |
| Sparkle Sam | Rainbow Orb | Fish Bell | Left Paws | Pink Hair | Bright Light |
| Minnie Mermaid | Bubble Staff | Catnip Cloak | Right Paws | Pink Hair | Cold Water |
| Nautilus Ned | Pearl Wand | Yarn Blaster | Right Paws | Pink Hair | Bright Light |
| Finley Purr | Shell Flute | Catnip Cloak | Right Paws | Silver Hair | Bright Light |
| Sandy Paws | Pearl Wand | Purr Compass | Right Paws | Gold Hair | Bright Light |
| Salty Sam | Shell Flute | Fish Bell | Left Paws | Pink Hair | Cold Water |
| Felix Float | Pearl Wand | Catnip Cloak | Right Paws | Gold Hair | Cold Water |
| Barnaby Bubbly | Star Gem | Glow Collar | Left Paws | Pink Hair | Cold Water |
| Unicorn Tail | Shell Flute | Purr Compass | Left Paws | Pink Hair | Cold Water |
| Shelly Tail | Bubble Staff | Yarn Blaster | Right Paws | Pink Hair | Bright Light |
| Coral Calico | Star Gem | Glow Collar | Left Paws | Silver Hair | Cold Water |
| Pearl Paws | Shell Flute | Purr Compass | Left Paws | Silver Hair | Loud Music |
| Paws Poseidon | Pearl Wand | Glow Collar | Right Paws | Silver Hair | Loud Music |
| Tide Tabby | Bubble Staff | Catnip Cloak | Left Paws | Pink Hair | Cold Water |
| Cleo Catlantis | Pearl Wand | Purr Compass | Left Paws | Pink Hair | Loud Music |
Clue 1
Addition
To open the ocean vault, count up all the shiny shells collected by the sea kitties.
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
65
96
97
86
38
78
78
87
38
48
54
69
97
29
48
69
T
65
61
29
97
87
57
61
67
67
51
69
79
57
87
29
29
23 + 42 =T
26 + 22 =N
15 + 14 =S
41 + 20 =U
37 + 20 =P
35 + 52 =A
26 + 12 =I
24 + 43 =R
25 + 44 =O
24 + 55 =M
31 + 65 =H
42 + 36 =L
16 + 38 =D
33 + 53 =V
35 + 62 =E
19 + 32 =C
0/16 letters found
Clue 2
Word problems
Solve these story problems about mermaid cats to figure out where the villain swam.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
L
32
34
6
16
15
35
7
S
There were 40 magic shells. 8 were used up. How many magic shells are left?L
Mermaid Kitty found 16 magic shells yesterday and 18 more today. How many magic shells in all?E
Mermaid Kitty found 11 purr pearls yesterday and 4 more today. How many purr pearls in all?P
There were 10 magic shells. 3 were used up. How many magic shells are left?W
Mermaid Kitty found 3 glitter scales yesterday and 3 more today. How many glitter scales in all?F
Mermaid Kitty lined up 2 rows of 8 magic shells. How many magic shells in all?T
Mermaid Kitty lined up 7 rows of 5 glitter scales. How many glitter scales in all?A
0/7 letters found
Clue 3
Skip counting
Count the glowing sea stars by twos to unlock the next secret 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.
C
27
6
130
22
28
26
12
50
14
20
26
22
50
12
60
50
C
27
65
130
18
14
9
12
14
50
12
14
50
26
12
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33C
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32W
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10O
Skip-count by 5s. Fill the blank: 5, 10, 15, ___, 25, 30M
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24P
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150L
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70E
0/14 letters found
Clue 4
Place value
Look at the magic shell counter to check the tens and ones places for clues.
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
46
81
67
26
A
46
84
42
76
29
72
32
84
60
48
A
46
32
26
81
67
47
66
60
67
76
67
48
85
81
48
85
57
57
What number has 4 tens and 6 ones?A
What number has 2 tens and 9 ones?F
What number has 4 tens and 8 ones?H
What number has 4 tens and 2 ones?D
What number has 8 tens and 5 ones?E
What number has 3 tens and 2 ones?I
What number has 7 tens and 6 ones?O
What number has 6 tens and 7 ones?T
What number has 2 tens and 6 ones?R
What number has 4 tens and 7 ones?U
What number has 6 tens and 6 ones?C
What number has 7 tens and 2 ones?P
What number has 8 tens and 1 one?S
What number has 6 tens and 0 ones?K
What number has 8 tens and 4 ones?N
What number has 5 tens and 7 ones?L
0/16 letters found
Clue 5
Missing addends — the last clue
Find how many missing pearls are needed to fill the jar and reveal the last clue.
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
3 + ___ = 10
4 + ___ = 15
10 + ___ = 12
2 + ___ = 10
10 + ___ = 11
7 + ___ = 10
5 + ___ = 15
8 + ___ = 20
10 + ___ = 15
9 + ___ = 18
2 + ___ = 8
Step 2 — cross out the sentence with each answer
1.The villain waved the pearl wand, then rang the fish bell.
2.The villain swung the bubble staff, then clicked the glow collar.
3.The villain swung the bubble staff, then fired the yarn blaster.
4.The villain tapped the star gem, then clicked the glow collar.
5.The villain shone the rainbow orb, then fired the yarn blaster.
6.The villain played the shell flute, then wrapped in the catnip cloak.
7.The villain swung the bubble staff, then wrapped in the catnip cloak.
8.The villain tapped the star gem, then wrapped in the catnip cloak.
9.The villain shone the rainbow orb, then rang the fish bell.
10.The villain waved the pearl wand, then checked the purr compass.
11.The villain played the shell flute, then rang the fish bell.
12.The villain swung the bubble staff, then rang the fish bell.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Rainbow Pearl
Culprit: Barnaby Bubbly (Star Gem · Glow Collar · Left Paws · Pink Hair · Cold Water)
- Clue 1 (Addition): "THE VILLAIN DOES NOT USE A PURR COMPASS"23 + 42 = 65 (T) · 26 + 22 = 48 (N) · 15 + 14 = 29 (S) · 41 + 20 = 61 (U) · 37 + 20 = 57 (P) · 35 + 52 = 87 (A) · 26 + 12 = 38 (I) · 24 + 43 = 67 (R) · 25 + 44 = 69 (O) · 24 + 55 = 79 (M) · 31 + 65 = 96 (H) · 42 + 36 = 78 (L) · 16 + 38 = 54 (D) · 33 + 53 = 86 (V) · 35 + 62 = 97 (E) · 19 + 32 = 51 (C)
- Clue 2 (Word problems): "LEFT PAWS"There were 40 magic shells. 8 were used up. How many magic shells are left? = 32 (L) · Mermaid Kitty found 16 magic shells yesterday and 18 more today. How many magic shells in all? = 34 (E) · Mermaid Kitty found 11 purr pearls yesterday and 4 more today. How many purr pearls in all? = 15 (P) · There were 10 magic shells. 3 were used up. How many magic shells are left? = 7 (W) · Mermaid Kitty found 3 glitter scales yesterday and 3 more today. How many glitter scales in all? = 6 (F) · Mermaid Kitty lined up 2 rows of 8 magic shells. How many magic shells in all? = 16 (T) · Mermaid Kitty lined up 7 rows of 5 glitter scales. How many glitter scales in all? = 35 (A)
- Clue 3 (Skip counting): "COLD WATER MADE THE CULPRIT RETREAT"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (C) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80 = 60 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (W) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, ___, 25, 30 = 20 (M) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (P) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (D) · 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 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (A) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (E)
- Clue 4 (Place value): "A STRAND OF PINK HAIR STUCK TO THE SHELL"What number has 4 tens and 6 ones? = 46 (A) · What number has 2 tens and 9 ones? = 29 (F) · What number has 4 tens and 8 ones? = 48 (H) · What number has 4 tens and 2 ones? = 42 (D) · What number has 8 tens and 5 ones? = 85 (E) · What number has 3 tens and 2 ones? = 32 (I) · What number has 7 tens and 6 ones? = 76 (O) · What number has 6 tens and 7 ones? = 67 (T) · What number has 2 tens and 6 ones? = 26 (R) · What number has 4 tens and 7 ones? = 47 (U) · What number has 6 tens and 6 ones? = 66 (C) · What number has 7 tens and 2 ones? = 72 (P) · What number has 8 tens and 1 one? = 81 (S) · What number has 6 tens and 0 ones? = 60 (K) · What number has 8 tens and 4 ones? = 84 (N) · What number has 5 tens and 7 ones? = 57 (L)
- Clue 5 (Missing addends): surviving statement (box 4) → Barnaby Bubbly3 + ___ = 10 = 7 · 4 + ___ = 15 = 11 · 10 + ___ = 12 = 2 · 2 + ___ = 10 = 8 · 10 + ___ = 11 = 1 · 7 + ___ = 10 = 3 · 5 + ___ = 15 = 10 · 8 + ___ = 20 = 12 · 10 + ___ = 15 = 5 · 9 + ___ = 18 = 9 · 2 + ___ = 8 = 6
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Word problems, Skip counting, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Case of the Missing Rainbow Pearl — set in Coral Cat Cove
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects