🦄 UnicornsGrade 7Reading: grades 5-6Fractions of a numberWord problemsMultiplicationIntegers
The Case of the Missing Golden Horn
The Golden Horn of Harmony has been stolen from the Prism Palace! The Grand Archivist is in a panic because without it, the rainbows of the valley will fade to gray. We have twenty-four suspect unicorns, but only one is the thief. Grab your notebook, detective!
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 Talent | Artifact Used | Dominant Hoof | Mane Color | Vulnerability |
|---|---|---|---|---|---|
| Silverstream | rainbow-weaving | hover boots | left-hoofed | sunset orange mane | bright lantern |
| Sapphire | teleportation | glitter shield | right-hoofed | neon pink mane | peppermint scent |
| Onyx | rainbow-weaving | glitter shield | left-hoofed | pastel blue mane | peppermint scent |
| Pip | dream-walking | echo horn | left-hoofed | pastel blue mane | peppermint scent |
| Nebulo | rainbow-weaving | gold lasso | right-hoofed | neon pink mane | bright lantern |
| Zephyr | rainbow-weaving | glitter shield | left-hoofed | pastel blue mane | bright lantern |
| Nova | star-glowing | hover boots | right-hoofed | sunset orange mane | peppermint scent |
| Twinkle | rainbow-weaving | mist cloak | left-hoofed | pastel blue mane | peppermint scent |
| Moonbeam | crystal-shaping | glitter shield | left-hoofed | neon pink mane | silver whistle |
| Buttercup | rainbow-weaving | mist cloak | right-hoofed | sunset orange mane | peppermint scent |
| Bellara | dream-walking | mist cloak | right-hoofed | neon pink mane | peppermint scent |
| Sparkles | rainbow-weaving | glitter shield | right-hoofed | neon pink mane | peppermint scent |
| Glimmer | crystal-shaping | hover boots | left-hoofed | neon pink mane | peppermint scent |
| Marigold | dream-walking | mist cloak | right-hoofed | sunset orange mane | bright lantern |
| Barnaby | rainbow-weaving | hover boots | left-hoofed | sunset orange mane | peppermint scent |
| Starlight | dream-walking | hover boots | right-hoofed | sunset orange mane | peppermint scent |
| Starburst | rainbow-weaving | glitter shield | right-hoofed | pastel blue mane | peppermint scent |
| Clover | rainbow-weaving | mist cloak | right-hoofed | sunset orange mane | silver whistle |
| Eclipse | teleportation | glitter shield | right-hoofed | pastel blue mane | peppermint scent |
| Glitterhoof | star-glowing | hover boots | left-hoofed | pastel blue mane | peppermint scent |
| Celestia | teleportation | echo horn | left-hoofed | pastel blue mane | peppermint scent |
Clue 1
Fractions of a number
The crystal guards found a map of Prism Valley. To read it, we must calculate what fraction of the magic stars are still shining tonight.
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
3
24
58
48
17
48
43
58
41
T
3
19
11
58
48
50
11
T
3
40
58
15
10
15
52
44
48
T
3
41
60
11
15
59
6/10 of 5 =T
3/6 of 80 =W
3/6 of 118 =K
4/8 of 116 =E
2/10 of 85 =U
1/5 of 120 =H
4/10 of 130 =M
1/3 of 57 =D
1/2 of 82 =C
5/10 of 30 =A
1/2 of 22 =O
4/8 of 86 =P
5/10 of 100 =N
3/4 of 64 =S
5/10 of 120 =L
2/6 of 30 =R
1/2 of 88 =I
0/17 letters found
Clue 2
Word problems
We found a scattered ledger outside the royal orchard. Sorting out the math reveals who visited the fruit trees before the crime.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas.
L
111
9
76
34
94
119
119
76
9
116
Twinkle the Pixie found 53 sparkle berries yesterday and 58 more today. How many sparkle berries in all?L
Twinkle the Pixie found 39 sparkle berries yesterday and 37 more today. How many sparkle berries in all?F
There were 138 stardust jars. 19 were used up. How many stardust jars are left?O
Twinkle the Pixie lined up 3 rows of 3 rainbow carrots. How many rainbow carrots in all?E
Twinkle the Pixie found 6 magic gems yesterday and 88 more today. How many magic gems in all?H
There were 40 golden apples. 6 were used up. How many golden apples are left?T
There were 141 golden apples. 25 were used up. How many golden apples are left?D
0/7 letters found
Clue 3
Multiplication facts (1-12)
The stable guards are organized in a giant grid. Multiplying the rows of defenders shows us which sector the suspect crossed.
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
64
2
27
110
66
27
21
80
100
144
27
27
3
66
8
110
66
27
27
30
27
81
21
T
64
50
27
50
50
27
32
99
3
66
T
64
8 × 8 =T
12 × 12 =L
3 × 10 =Z
10 × 8 =K
4 × 8 =R
5 × 10 =P
9 × 11 =M
3 × 9 =E
7 × 3 =A
11 × 6 =N
10 × 10 =F
2 × 1 =H
1 × 3 =I
9 × 9 =D
8 × 1 =G
11 × 10 =S
0/16 letters found
Clue 4
Integers
To track the flying getaway path, we have to calculate the rise and fall of altitude using positive and negative heights.
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
3
19
29
19
9
19
11
9
19
29
10
13
4
19
24
30
1
19
16
9
6
30
1
29
16
30
9
9
22
19
16
11
19
1
19
(-15) + 18 =W
20 - (-10) =A
7 - (-6) =L
(-8) + 32 =M
(-15) + 44 =D
(-1) + 10 =T
6 - (-13) =E
(-11) + 22 =C
(-5) + 9 =U
(-15) + 31 =S
(-10) + 11 =N
(-14) + 24 =B
(-6) + 12 =R
(-14) + 36 =H
0/14 letters found
Clue 5
Fractions of a number — the last clue
The fountain of stardust will only wash away the magic fog if we fill exactly two-thirds of the pool. Let's do the fraction math.
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
1/4 of 36 = ?
1/2 of 6 = ?
2/10 of 60 = ?
1/2 of 14 = ?
1/6 of 12 = ?
1/3 of 18 = ?
1/10 of 100 = ?
1/4 of 44 = ?
1/3 of 3 = ?
1/10 of 40 = ?
1/10 of 50 = ?
Step 2 — cross out the sentence with each answer
1.The villain melted the crystal vault door, then zoomed over the palace walls on hover boots.
2.The villain blinded the night guard with a starlight flash, then swung up to the high balcony with a gold lasso.
3.The villain teleported right past the main gate, then blasted a loud echo horn to cause a panic.
4.The villain blinded the night guard with a starlight flash, then blasted a loud echo horn to cause a panic.
5.The villain teleported right past the main gate, then swung up to the high balcony with a gold lasso.
6.The villain weaved a solid rainbow bridge, then faded into the shadows inside a mist cloak.
7.The villain teleported right past the main gate, then shielded themselves behind a glitter barrier.
8.The villain weaved a solid rainbow bridge, then shielded themselves behind a glitter barrier.
9.The villain blinded the night guard with a starlight flash, then zoomed over the palace walls on hover boots.
10.The villain weaved a solid rainbow bridge, then blasted a loud echo horn to cause a panic.
11.The villain weaved a solid rainbow bridge, then zoomed over the palace walls on hover boots.
12.The villain put the royal family into a deep dream, then blasted a loud echo horn to cause a panic.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Golden Horn
Culprit: Onyx (rainbow-weaving · glitter shield · left-hoofed · pastel blue mane · peppermint scent)
- Clue 1 (Fractions of a number): "THE SUSPECT DOES NOT WEAR A MIST CLOAK"6/10 of 5 = 3 (T) · 3/6 of 80 = 40 (W) · 3/6 of 118 = 59 (K) · 4/8 of 116 = 58 (E) · 2/10 of 85 = 17 (U) · 1/5 of 120 = 24 (H) · 4/10 of 130 = 52 (M) · 1/3 of 57 = 19 (D) · 1/2 of 82 = 41 (C) · 5/10 of 30 = 15 (A) · 1/2 of 22 = 11 (O) · 4/8 of 86 = 43 (P) · 5/10 of 100 = 50 (N) · 3/4 of 64 = 48 (S) · 5/10 of 120 = 60 (L) · 2/6 of 30 = 10 (R) · 1/2 of 88 = 44 (I)
- Clue 2 (Word problems): "LEFT HOOFED"Twinkle the Pixie found 53 sparkle berries yesterday and 58 more today. How many sparkle berries in all? = 111 (L) · Twinkle the Pixie found 39 sparkle berries yesterday and 37 more today. How many sparkle berries in all? = 76 (F) · There were 138 stardust jars. 19 were used up. How many stardust jars are left? = 119 (O) · Twinkle the Pixie lined up 3 rows of 3 rainbow carrots. How many rainbow carrots in all? = 9 (E) · Twinkle the Pixie found 6 magic gems yesterday and 88 more today. How many magic gems in all? = 94 (H) · There were 40 golden apples. 6 were used up. How many golden apples are left? = 34 (T) · There were 141 golden apples. 25 were used up. How many golden apples are left? = 116 (D)
- Clue 3 (Multiplication facts (1-12)): "THE SNEAK FLEEING SNEEZED AT PEPPERMINT"8 × 8 = 64 (T) · 12 × 12 = 144 (L) · 3 × 10 = 30 (Z) · 10 × 8 = 80 (K) · 4 × 8 = 32 (R) · 5 × 10 = 50 (P) · 9 × 11 = 99 (M) · 3 × 9 = 27 (E) · 7 × 3 = 21 (A) · 11 × 6 = 66 (N) · 10 × 10 = 100 (F) · 2 × 1 = 2 (H) · 1 × 3 = 3 (I) · 9 × 9 = 81 (D) · 8 × 1 = 8 (G) · 11 × 10 = 110 (S)
- Clue 4 (Integers): "WE DETECTED BLUE MANE STRANDS AT THE SCENE"(-15) + 18 = 3 (W) · 20 - (-10) = 30 (A) · 7 - (-6) = 13 (L) · (-8) + 32 = 24 (M) · (-15) + 44 = 29 (D) · (-1) + 10 = 9 (T) · 6 - (-13) = 19 (E) · (-11) + 22 = 11 (C) · (-5) + 9 = 4 (U) · (-15) + 31 = 16 (S) · (-10) + 11 = 1 (N) · (-14) + 24 = 10 (B) · (-6) + 12 = 6 (R) · (-14) + 36 = 22 (H)
- Clue 5 (Fractions of a number): surviving statement (box 8) → Onyx1/4 of 36 = 9 · 1/2 of 6 = 3 · 2/10 of 60 = 12 · 1/2 of 14 = 7 · 1/6 of 12 = 2 · 1/3 of 18 = 6 · 1/10 of 100 = 10 · 1/4 of 44 = 11 · 1/3 of 3 = 1 · 1/10 of 40 = 4 · 1/10 of 50 = 5
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Fractions of a number, Word problems, Multiplication, Integers
- Reading level
- grades 5-6
- Theme
- The Case of the Missing Golden Horn — set in Prism Palace in the magical realm of Celestia
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects