🌊 Unicorns, MermaidsGrade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Mystery of the Glitter Pearl
A sneaky bubble thief took the giant Glitter Pearl from the Coral Castle. Mermaids and sea-unicorns need your help. 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 Power | Special Skill | Writing Hand | Hair Color | Best Stop Weapon |
|---|---|---|---|---|---|
| Ariel | bubble shield | pearl blast | left handed | blue hair | shiny mirror |
| Shelly | rainbow dash | tide swim | right handed | blue hair | tickle feather |
| Melody | star spark | kelp wrap | left handed | pink hair | tickle feather |
| Coral | star spark | pearl blast | right handed | blue hair | silly joke |
| Sandy | coral glow | tide swim | right handed | purple hair | tickle feather |
| Misty | rainbow dash | tide swim | left handed | blue hair | silly joke |
| Cleo | rainbow dash | glow horn | right handed | blue hair | shiny mirror |
| Aqua | coral glow | sea shell song | right handed | blue hair | shiny mirror |
| Marina | star spark | kelp wrap | right handed | blue hair | silly joke |
| Glimmer | coral glow | kelp wrap | left handed | purple hair | silly joke |
| Splash | rainbow dash | kelp wrap | right handed | blue hair | silly joke |
| Luna | coral glow | sea shell song | right handed | blue hair | silly joke |
| Shimmer | coral glow | tide swim | right handed | blue hair | tickle feather |
| Bubbles | wave splash | kelp wrap | right handed | pink hair | shiny mirror |
| Wave | coral glow | glow horn | right handed | blue hair | silly joke |
| Sparkle | wave splash | kelp wrap | right handed | pink hair | tickle feather |
| Sunny | wave splash | sea shell song | right handed | blue hair | silly joke |
| Pearl | coral glow | tide swim | right handed | purple hair | silly joke |
| Sirena | wave splash | tide swim | right handed | purple hair | shiny mirror |
| Star | coral glow | pearl blast | right handed | pink hair | silly joke |
| Sky | rainbow dash | sea shell song | right handed | pink hair | silly joke |
Clue 1
Place value
A secret code is locked on a sea chest. The lock uses blocks of tens and ones to show the code.
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
35
57
85
T
35
57
82
85
45
49
64
40
40
44
T
35
27
82
40
20
64
27
85
64
27
57
85
69
69
27
44
40
20
What number has 3 tens and 5 ones?T
What number has 5 tens and 7 ones?H
What number has 8 tens and 2 ones?I
What number has 4 tens and 9 ones?C
What number has 4 tens and 5 ones?F
What number has 4 tens and 4 ones?O
What number has 4 tens and 0 ones?N
What number has 2 tens and 0 ones?G
What number has 8 tens and 5 ones?E
What number has 2 tens and 7 ones?S
What number has 6 tens and 4 ones?A
What number has 6 tens and 9 ones?L
0/12 letters found
Clue 2
Addition
We need to count the starfish. Let us add the red group and the blue group together to get the total.
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
86
55
46
87
94
46
82
28
65
T
86
55
33
46
22
81
57
33
T
86
46
87
81
33
T
86
55
T
86
55
46
33
57
57
33
23
55
T
86
55
82
94
73
39 + 47 =T
41 + 53 =N
22 + 11 =I
53 + 34 =S
18 + 10 =K
19 + 46 =Y
12 + 10 =F
33 + 40 =D
57 + 24 =W
21 + 36 =R
35 + 20 =H
32 + 50 =A
16 + 7 =G
18 + 28 =E
0/14 letters found
Clue 3
Subtraction
Some sea shells floated away in the tide. We must subtract the lost shells from our pile to see what is left.
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
26
82
74
83
83
15
28
34
72
64
46
74
83
83
82
71
34
62
71
14
64
71
14
74
64
66
28 - 2 =A
108 - 34 =I
100 - 38 =P
53 - 39 =H
60 - 26 =O
84 - 20 =E
92 - 20 =K
119 - 37 =S
83 - 12 =T
78 - 12 =F
49 - 34 =Y
99 - 16 =L
65 - 37 =J
65 - 19 =W
0/14 letters found
Clue 4
Skip counting
Sea horses swim in neat rows of five. We can count them fast if we count by fives to reach the end.
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
70
33
16
26
24
110
27
130
8
24
33
40
35
36
15
35
100
100
40
33
80
35
90
100
8
33
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80W
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110S
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150B
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21R
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20F
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42I
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100C
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39E
0/16 letters found
Clue 5
Missing addends — the last clue
We need ten pink pearls for the magic wand. We only have six pearls. How many more do we need to find?
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
7 + ___ = 18
6 + ___ = 18
5 + ___ = 15
2 + ___ = 7
2 + ___ = 6
3 + ___ = 9
3 + ___ = 6
5 + ___ = 7
8 + ___ = 15
4 + ___ = 13
7 + ___ = 8
Step 2 — cross out the sentence with each answer
1.The villain floats in a giant bubble, then giggles with the sea turtles.
2.The villain gallops on a rainbow trail, then hides behind a kelp forest.
3.The villain swims through the coral, then drops a trail of glitter.
4.The villain gallops on a rainbow trail, then giggles with the sea turtles.
5.The villain swims through the coral, then giggles with the sea turtles.
6.The villain gallops on a rainbow trail, then loses a shiny scale.
7.The villain leaps over the sea wall, then tucks the pearl into a shell.
8.The villain gallops on a rainbow trail, then tucks the pearl into a shell.
9.The villain floats in a giant bubble, then drops a trail of glitter.
10.The villain leaps over the sea wall, then hides behind a kelp forest.
11.The villain splashes in the warm tide, then drops a trail of glitter.
12.The villain splashes in the warm tide, then tucks the pearl into a shell.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Glitter Pearl
Culprit: Splash (rainbow dash · kelp wrap · right handed · blue hair · silly joke)
- Clue 1 (Place value): "THE THIEF CANNOT SING A SEA SHELL SONG"What number has 3 tens and 5 ones? = 35 (T) · What number has 5 tens and 7 ones? = 57 (H) · What number has 8 tens and 2 ones? = 82 (I) · What number has 4 tens and 9 ones? = 49 (C) · What number has 4 tens and 5 ones? = 45 (F) · What number has 4 tens and 4 ones? = 44 (O) · What number has 4 tens and 0 ones? = 40 (N) · What number has 2 tens and 0 ones? = 20 (G) · What number has 8 tens and 5 ones? = 85 (E) · What number has 2 tens and 7 ones? = 27 (S) · What number has 6 tens and 4 ones? = 64 (A) · What number has 6 tens and 9 ones? = 69 (L)
- Clue 2 (Addition): "THE SNEAKY THIEF WRITES WITH THEIR RIGHT HAND"39 + 47 = 86 (T) · 41 + 53 = 94 (N) · 22 + 11 = 33 (I) · 53 + 34 = 87 (S) · 18 + 10 = 28 (K) · 19 + 46 = 65 (Y) · 12 + 10 = 22 (F) · 33 + 40 = 73 (D) · 57 + 24 = 81 (W) · 21 + 36 = 57 (R) · 35 + 20 = 55 (H) · 32 + 50 = 82 (A) · 16 + 7 = 23 (G) · 18 + 28 = 46 (E)
- Clue 3 (Subtraction): "A SILLY JOKE WILL STOP THE THIEF"28 - 2 = 26 (A) · 108 - 34 = 74 (I) · 100 - 38 = 62 (P) · 53 - 39 = 14 (H) · 60 - 26 = 34 (O) · 84 - 20 = 64 (E) · 92 - 20 = 72 (K) · 119 - 37 = 82 (S) · 83 - 12 = 71 (T) · 78 - 12 = 66 (F) · 49 - 34 = 15 (Y) · 99 - 16 = 83 (L) · 65 - 37 = 28 (J) · 65 - 19 = 46 (W)
- Clue 4 (Skip counting): "WE FOUND BLUE HAIR AT THE CASTLE"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (H) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (B) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (F) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (E)
- Clue 5 (Missing addends): surviving statement (box 8) → Splash7 + ___ = 18 = 11 · 6 + ___ = 18 = 12 · 5 + ___ = 15 = 10 · 2 + ___ = 7 = 5 · 2 + ___ = 6 = 4 · 3 + ___ = 9 = 6 · 3 + ___ = 6 = 3 · 5 + ___ = 7 = 2 · 8 + ___ = 15 = 7 · 4 + ___ = 13 = 9 · 7 + ___ = 8 = 1
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 Mystery of the Glitter Pearl — set in Coral Cove Castle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects