🌊 Unicorns, MermaidsGrade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Case of the Missing Rainbow Crown
The Rainbow Crown has disappeared from Coral Cove Reef! Detective, solve the clues and stop the Sea Bandit!
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 | Extra Power | Handedness | Mane Color | Weakness |
|---|---|---|---|---|---|
| Blaze | magic song | rainbow blast | right handed | pink mane | glow kelp |
| Pearl | hoof stamp | rainbow blast | left handed | pink mane | moon dust |
| Splash | hoof stamp | rainbow blast | right handed | blue mane | glow kelp |
| Jewel | tide surge | star spray | left handed | blue mane | glow kelp |
| Tide | hoof stamp | star spray | right handed | purple mane | moon dust |
| Star | hoof stamp | glitter storm | right handed | pink mane | sea salt |
| River | horn beam | star spray | left handed | blue mane | sea salt |
| Finley | tide surge | rainbow blast | left handed | pink mane | moon dust |
| Ariel | hoof stamp | bubble wave | right handed | purple mane | moon dust |
| Shelly | tide surge | glitter storm | left handed | pink mane | moon dust |
| Sparkle | magic song | pearl shield | left handed | pink mane | sea salt |
| Coral | magic song | glitter storm | right handed | blue mane | sea salt |
| Skye | hoof stamp | rainbow blast | left handed | pink mane | sea salt |
| Kai | tide surge | bubble wave | left handed | blue mane | glow kelp |
| Sunny | magic song | rainbow blast | left handed | pink mane | moon dust |
| Wave | tail splash | bubble wave | right handed | blue mane | sea salt |
| Storm | tail splash | star spray | left handed | pink mane | moon dust |
| Dawn | tail splash | pearl shield | right handed | pink mane | moon dust |
| Crystal | hoof stamp | bubble wave | right handed | pink mane | sea salt |
| Bubbles | horn beam | star spray | right handed | blue mane | glow kelp |
| Marina | hoof stamp | rainbow blast | left handed | purple mane | moon dust |
Clue 1
Place value
Look at the magic shell counter to find the tens and ones.
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
51
57
75
36
45
60
60
33
45
59
13
43
75
76
59
43
T
51
68
76
75
34
60
45
T
51
T
51
75
73
76
T
51
43
73
37
What number has 5 tens and 1 one?T
What number has 3 tens and 6 ones?V
What number has 4 tens and 5 ones?I
What number has 7 tens and 6 ones?S
What number has 3 tens and 4 ones?G
What number has 6 tens and 0 ones?L
What number has 6 tens and 8 ones?U
What number has 5 tens and 9 ones?N
What number has 3 tens and 3 ones?A
What number has 3 tens and 7 ones?M
What number has 5 tens and 7 ones?H
What number has 7 tens and 3 ones?R
What number has 7 tens and 5 ones?E
What number has 1 ten and 3 ones?D
What number has 4 tens and 3 ones?O
0/15 letters found
Clue 2
Addition
Add up all the shiny sea gems collected along the reef.
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
25
72
51
48
33
56
98
98
98
A
25
72
A
25
97
56
27
48
84
A
25
33
63
56
63
67
51
97
97
A
25
51
33
9 + 16 =A
33 + 30 =D
22 + 45 =V
40 + 58 =S
40 + 16 =E
11 + 22 =N
8 + 19 =F
33 + 39 =W
46 + 38 =H
18 + 33 =I
16 + 32 =T
63 + 34 =L
0/12 letters found
Clue 3
Subtraction
Take away the damaged pearls from the total clam treasure.
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
24
17
35
47
28
87
87
43
28
65
18
87
35
45
18
59
68
66
66
68
68
65
45
12
25
T
24
42 - 18 =T
21 - 4 =H
78 - 10 =O
103 - 38 =N
107 - 20 =L
27 - 9 =F
97 - 38 =R
69 - 22 =V
88 - 22 =M
57 - 29 =I
77 - 34 =A
63 - 38 =S
74 - 39 =E
82 - 37 =D
42 - 30 =U
0/15 letters found
Clue 4
Skip counting
Count by twos along the stepping stones in the cove.
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
130
120
70
33
30
28
A
130
33
100
27
45
42
A
130
33
24
26
A
130
27
A
130
45
45
36
100
27
55
100
33
100
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40K
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30W
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65C
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32M
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140P
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30D
0/14 letters found
Clue 5
Missing addends — the last clue
Find the missing magic stars to complete the spell grid.
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 + ___ = 10
3 + ___ = 6
2 + ___ = 8
9 + ___ = 14
3 + ___ = 14
8 + ___ = 18
4 + ___ = 11
4 + ___ = 8
2 + ___ = 3
4 + ___ = 13
2 + ___ = 4
Step 2 — cross out the sentence with each answer
1.The villain shot a horn beam, then made a bubble wave.
2.The villain gave a hoof stamp, then raised a pearl shield.
3.The villain gave a hoof stamp, then shot a rainbow blast.
4.The villain gave a hoof stamp, then made a bubble wave.
5.The villain sang a magic song, then made a bubble wave.
6.The villain made a tail splash, then launched a star spray.
7.The villain created a tide surge, then made a bubble wave.
8.The villain sang a magic song, then shot a rainbow blast.
9.The villain created a tide surge, then raised a pearl shield.
10.The villain made a tail splash, then caused a glitter storm.
11.The villain gave a hoof stamp, then caused a glitter storm.
12.The villain created a tide surge, then shot a rainbow blast.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Rainbow Crown
Culprit: Finley (tide surge · rainbow blast · left handed · pink mane · moon dust)
- Clue 1 (Place value): "THE VILLAIN DOES NOT USE GLITTER STORM"What number has 5 tens and 1 one? = 51 (T) · What number has 3 tens and 6 ones? = 36 (V) · What number has 4 tens and 5 ones? = 45 (I) · What number has 7 tens and 6 ones? = 76 (S) · What number has 3 tens and 4 ones? = 34 (G) · What number has 6 tens and 0 ones? = 60 (L) · What number has 6 tens and 8 ones? = 68 (U) · What number has 5 tens and 9 ones? = 59 (N) · What number has 3 tens and 3 ones? = 33 (A) · What number has 3 tens and 7 ones? = 37 (M) · What number has 5 tens and 7 ones? = 57 (H) · What number has 7 tens and 3 ones? = 73 (R) · What number has 7 tens and 5 ones? = 75 (E) · What number has 1 ten and 3 ones? = 13 (D) · What number has 4 tens and 3 ones? = 43 (O)
- Clue 2 (Addition): "A WITNESS SAW A LEFT HANDED VILLAIN"9 + 16 = 25 (A) · 33 + 30 = 63 (D) · 22 + 45 = 67 (V) · 40 + 58 = 98 (S) · 40 + 16 = 56 (E) · 11 + 22 = 33 (N) · 8 + 19 = 27 (F) · 33 + 39 = 72 (W) · 46 + 38 = 84 (H) · 18 + 33 = 51 (I) · 16 + 32 = 48 (T) · 63 + 34 = 97 (L)
- Clue 3 (Subtraction): "THE VILLAIN FLED FROM MOON DUST"42 - 18 = 24 (T) · 21 - 4 = 17 (H) · 78 - 10 = 68 (O) · 103 - 38 = 65 (N) · 107 - 20 = 87 (L) · 27 - 9 = 18 (F) · 97 - 38 = 59 (R) · 69 - 22 = 47 (V) · 88 - 22 = 66 (M) · 57 - 29 = 28 (I) · 77 - 34 = 43 (A) · 63 - 38 = 25 (S) · 74 - 39 = 35 (E) · 82 - 37 = 45 (D) · 42 - 30 = 12 (U)
- Clue 4 (Skip counting): "A PINK MANE STRAND WAS AT THE SCENE"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 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (K) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (W) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (M) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (H) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (P) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (D)
- Clue 5 (Missing addends): surviving statement (box 12) → Finley2 + ___ = 10 = 8 · 3 + ___ = 6 = 3 · 2 + ___ = 8 = 6 · 9 + ___ = 14 = 5 · 3 + ___ = 14 = 11 · 8 + ___ = 18 = 10 · 4 + ___ = 11 = 7 · 4 + ___ = 8 = 4 · 2 + ___ = 3 = 1 · 4 + ___ = 13 = 9 · 2 + ___ = 4 = 2
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 Case of the Missing Rainbow Crown — set in Coral Cove Reef
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects