🌊 Mermaids, Unicorns, MinecrafGrade 2Reading: grades 3-4Place valueAdditionSubtractionSkip countingMissing addends
The Case of the Missing Prismarine Horn
A mysterious intruder swam into the underwater block castle and snatched the sacred Prismarine Horn! Solve the clues to discover who took it.
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 Ability | Unicorn Skill | Dominant Hand | Mane Style | Secret Weakness |
|---|---|---|---|---|---|
| Marina Block | Kelp Farming | Glowing Horn | Right-handed Builder | Neon Blue Mane | Music Discs |
| Pebble Pat | Bubble Mining | Starfish Shield | Left-handed Builder | Neon Blue Mane | Golden Apples |
| Starling Sea | Prismarine Beam | Starfish Shield | Left-handed Builder | Neon Blue Mane | Music Discs |
| Sandy Shimmer | Pearl Crafting | Glowing Horn | Right-handed Builder | Glitter Pink Fins | Music Discs |
| Ray Reef | Bubble Mining | Diamond Hooves | Right-handed Builder | Seafoam Green Locks | Sponges |
| Neptune Glint | Rainbow Swimming | Diamond Hooves | Left-handed Builder | Glitter Pink Fins | Music Discs |
| Mariner Morgan | Bubble Mining | Sparkle Dash | Right-handed Builder | Seafoam Green Locks | Golden Apples |
| Glimmer Grace | Bubble Mining | Glowing Horn | Left-handed Builder | Seafoam Green Locks | Sponges |
| Aqua Avery | Prismarine Beam | Sparkle Dash | Right-handed Builder | Glitter Pink Fins | Music Discs |
| Kelp Alex | Prismarine Beam | Diamond Hooves | Right-handed Builder | Glitter Pink Fins | Music Discs |
| Glitter Jordan | Kelp Farming | Coral Teleport | Left-handed Builder | Neon Blue Mane | Golden Apples |
| Tide Taylor | Rainbow Swimming | Coral Teleport | Right-handed Builder | Glitter Pink Fins | Golden Apples |
| Cascade Cody | Prismarine Beam | Starfish Shield | Right-handed Builder | Seafoam Green Locks | Music Discs |
| Coral Brody | Prismarine Beam | Diamond Hooves | Left-handed Builder | Seafoam Green Locks | Sponges |
| Siren Sky | Prismarine Beam | Starfish Shield | Right-handed Builder | Glitter Pink Fins | Music Discs |
| Crystal Kai | Rainbow Swimming | Sparkle Dash | Right-handed Builder | Glitter Pink Fins | Music Discs |
| Finley Craft | Bubble Mining | Diamond Hooves | Left-handed Builder | Neon Blue Mane | Sponges |
| Opal Ocean | Rainbow Swimming | Starfish Shield | Right-handed Builder | Glitter Pink Fins | Golden Apples |
| Pearl Sparkle | Kelp Farming | Sparkle Dash | Right-handed Builder | Seafoam Green Locks | Music Discs |
| Splashy Sam | Kelp Farming | Glowing Horn | Left-handed Builder | Seafoam Green Locks | Golden Apples |
| Wavey Wyatt | Pearl Crafting | Sparkle Dash | Right-handed Builder | Neon Blue Mane | Sponges |
Clue 1
Place value
The Coral Keeper checked the digital block counter near the reef gate, but only the place values were readable.
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
53
59
50
14
88
20
20
37
88
34
73
63
50
52
34
63
T
53
17
52
50
52
T
53
37
40
81
88
52
59
52
59
88
50
20
73
What number has 5 tens and 3 ones?T
What number has 3 tens and 4 ones?N
What number has 2 tens and 0 ones?L
What number has 6 tens and 3 ones?O
What number has 3 tens and 7 ones?A
What number has 1 ten and 7 ones?U
What number has 8 tens and 8 ones?I
What number has 1 ten and 4 ones?V
What number has 5 tens and 0 ones?E
What number has 7 tens and 3 ones?D
What number has 5 tens and 9 ones?H
What number has 8 tens and 1 one?F
What number has 4 tens and 0 ones?R
What number has 5 tens and 2 ones?S
0/14 letters found
Clue 2
Addition
To search the kelp forest, you combine the tally totals of found block fragments.
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
93
54
33
65
58
36
36
36
39
W
93
39
98
54
89
68
33
68
39
65
60
58
60
81
77
54
46
60
58
98
59 + 34 =W
13 + 20 =T
60 + 38 =R
19 + 35 =I
36 + 41 =U
47 + 34 =B
26 + 20 =L
30 + 30 =D
19 + 39 =E
25 + 40 =N
26 + 63 =G
45 + 23 =H
12 + 27 =A
22 + 14 =S
0/14 letters found
Clue 3
Subtraction
You calculate how many sparkle gems were taken from the ocean 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.
T
25
89
67
52
77
42
42
11
77
50
74
11
70
70
T
25
36
41
41
67
61
23
56
35
48
70
77
88
61
77
70
88
70
60 - 35 =T
46 - 11 =M
94 - 5 =H
73 - 25 =U
40 - 29 =A
94 - 33 =D
67 - 31 =O
76 - 6 =S
90 - 2 =C
87 - 10 =I
88 - 14 =W
53 - 1 =V
57 - 16 =P
88 - 38 =N
56 - 14 =L
34 - 11 =B
59 - 3 =Y
75 - 8 =E
0/18 letters found
Clue 4
Skip counting
Following a trail of glowing shells, you count them in equal groups along the sea floor.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
F
40
8
42
100
60
55
90
130
27
27
24
22
10
130
100
15
F
40
130
100
33
14
27
33
50
24
100
24
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26R
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120N
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70D
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60C
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14P
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25K
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39S
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65G
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18A
0/16 letters found
Clue 5
Missing addends — the last clue
The vault door needs a balanced number of rainbow pearls to unlock the final 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
6 + ___ = 17
5 + ___ = 15
6 + ___ = 10
10 + ___ = 15
2 + ___ = 14
3 + ___ = 6
10 + ___ = 17
5 + ___ = 11
8 + ___ = 9
6 + ___ = 8
3 + ___ = 12
Step 2 — cross out the sentence with each answer
1.The villain mined sparkling bubble crystal, then stamped with diamond hooves.
2.The villain harvested glowing kelp beds, then lit up a glowing horn.
3.The villain fired a prismarine beam, then lit up a glowing horn.
4.The villain fired a prismarine beam, then stamped with diamond hooves.
5.The villain crafted prismarine blocks, then performed a sparkle dash.
6.The villain swam through rainbow kelp, then used coral teleportation.
7.The villain swam through rainbow kelp, then lit up a glowing horn.
8.The villain fired a prismarine beam, then performed a sparkle dash.
9.The villain mined sparkling bubble crystal, then raised a starfish shield.
10.The villain swam through rainbow kelp, then performed a sparkle dash.
11.The villain crafted prismarine blocks, then lit up a glowing horn.
12.The villain swam through rainbow kelp, then raised a starfish shield.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Prismarine Horn
Culprit: Aqua Avery (Prismarine Beam · Sparkle Dash · Right-handed Builder · Glitter Pink Fins · Music Discs)
- Clue 1 (Place value): "THE VILLAIN DOES NOT USE STARFISH SHIELD"What number has 5 tens and 3 ones? = 53 (T) · What number has 3 tens and 4 ones? = 34 (N) · What number has 2 tens and 0 ones? = 20 (L) · What number has 6 tens and 3 ones? = 63 (O) · What number has 3 tens and 7 ones? = 37 (A) · What number has 1 ten and 7 ones? = 17 (U) · What number has 8 tens and 8 ones? = 88 (I) · What number has 1 ten and 4 ones? = 14 (V) · What number has 5 tens and 0 ones? = 50 (E) · What number has 7 tens and 3 ones? = 73 (D) · What number has 5 tens and 9 ones? = 59 (H) · What number has 8 tens and 1 one? = 81 (F) · What number has 4 tens and 0 ones? = 40 (R) · What number has 5 tens and 2 ones? = 52 (S)
- Clue 2 (Addition): "WITNESS SAW A RIGHT HANDED BUILDER"59 + 34 = 93 (W) · 13 + 20 = 33 (T) · 60 + 38 = 98 (R) · 19 + 35 = 54 (I) · 36 + 41 = 77 (U) · 47 + 34 = 81 (B) · 26 + 20 = 46 (L) · 30 + 30 = 60 (D) · 19 + 39 = 58 (E) · 25 + 40 = 65 (N) · 26 + 63 = 89 (G) · 45 + 23 = 68 (H) · 12 + 27 = 39 (A) · 22 + 14 = 36 (S)
- Clue 3 (Subtraction): "THE VILLAIN WAS STOPPED BY MUSIC DISCS"60 - 35 = 25 (T) · 46 - 11 = 35 (M) · 94 - 5 = 89 (H) · 73 - 25 = 48 (U) · 40 - 29 = 11 (A) · 94 - 33 = 61 (D) · 67 - 31 = 36 (O) · 76 - 6 = 70 (S) · 90 - 2 = 88 (C) · 87 - 10 = 77 (I) · 88 - 14 = 74 (W) · 53 - 1 = 52 (V) · 57 - 16 = 41 (P) · 88 - 38 = 50 (N) · 56 - 14 = 42 (L) · 34 - 11 = 23 (B) · 59 - 3 = 56 (Y) · 75 - 8 = 67 (E)
- Clue 4 (Skip counting): "FOUND GLITTER PINK FINS AT SCENE"Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (N) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (I) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (D) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (C) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (P) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (K) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (S) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (G) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (A)
- Clue 5 (Missing addends): surviving statement (box 8) → Aqua Avery6 + ___ = 17 = 11 · 5 + ___ = 15 = 10 · 6 + ___ = 10 = 4 · 10 + ___ = 15 = 5 · 2 + ___ = 14 = 12 · 3 + ___ = 6 = 3 · 10 + ___ = 17 = 7 · 5 + ___ = 11 = 6 · 8 + ___ = 9 = 1 · 6 + ___ = 8 = 2 · 3 + ___ = 12 = 9
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Prismarine Horn — set in Prismarine Reef Kingdom
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects