🦄 UnicornsGrade 5Reading: grades 3-4RoundingSkip countingWord problemsBar modelsMissing addends
The Case of the Stolen Crystal Horn
Someone snuck into Cloudberry Meadow High Stables and swiped the sacred Crystal Horn! Solve the math clues, track down the evidence, and figure out which sneaky suspect took the treasure.
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 Spark | Enchanted Gear | Hoof Mark | Mane Color | Treat Dislike |
|---|---|---|---|---|---|
| Barnaby Glint | Moon Glow | Star Ribbon | Right Hoof Tap | Pastel Pink | Fizzy Berries |
| Pippin Trotter | Gem Sparkle | Silver Saddle | Right Hoof Tap | Pastel Pink | Bitter Grass |
| Sam Sunbeam | Gem Sparkle | Silver Saddle | Right Hoof Tap | Sky Blue | Sour Apples |
| Bella Buttercup | Rainbow Shield | Star Ribbon | Left Hoof Tap | Pastel Pink | Fizzy Berries |
| Rosie Meadow | Cloud Hover | Silver Saddle | Left Hoof Tap | Sky Blue | Sour Apples |
| Felix Flutter | Gem Sparkle | Velvet Blanket | Left Hoof Tap | Pastel Pink | Fizzy Berries |
| Maya Moonbeam | Moon Glow | Star Ribbon | Right Hoof Tap | Pastel Pink | Sour Apples |
| Gus Glitter | Moon Glow | Crystal Bell | Right Hoof Tap | Pastel Pink | Sour Apples |
| Ziggy Zap | Gem Sparkle | Star Ribbon | Right Hoof Tap | Sky Blue | Sour Apples |
| Daisy Dewdrop | Rainbow Shield | Crystal Bell | Left Hoof Tap | Pastel Pink | Bitter Grass |
| Hazel Hoof | Rainbow Shield | Crystal Bell | Left Hoof Tap | Sky Blue | Sour Apples |
| Chloe Cloud | Rainbow Shield | Velvet Blanket | Left Hoof Tap | Pastel Pink | Bitter Grass |
| Willow Breeze | Starlight Dash | Star Ribbon | Right Hoof Tap | Sky Blue | Sour Apples |
| Ruby Radiance | Gem Sparkle | Crystal Bell | Left Hoof Tap | Pastel Pink | Bitter Grass |
| Penny Pasture | Moon Glow | Crystal Bell | Right Hoof Tap | Pastel Pink | Bitter Grass |
| Toby Twilight | Gem Sparkle | Star Ribbon | Left Hoof Tap | Sky Blue | Bitter Grass |
| Jasper Jewel | Starlight Dash | Crystal Bell | Left Hoof Tap | Pastel Pink | Bitter Grass |
| Milo Marshmallow | Rainbow Shield | Golden Bridle | Left Hoof Tap | Pastel Pink | Bitter Grass |
| Nora Nectar | Starlight Dash | Velvet Blanket | Right Hoof Tap | Sky Blue | Bitter Grass |
| Sparkle Blossom | Gem Sparkle | Silver Saddle | Left Hoof Tap | Sky Blue | Sour Apples |
| Leo Luster | Gem Sparkle | Velvet Blanket | Left Hoof Tap | Sky Blue | Fizzy Berries |
Clue 1
Rounding
The enchanted stable radar rounds all distances to the nearest ten meters.
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
130
300
3700
900
370
2300
2300
170
370
9000
200
230
3700
1700
9000
230
T
130
7000
3700
170
70
170
50
230
2300
200
3700
9000
3000
70
370
200
2300
3700
Round 129 to the nearest tenT
Round 373 to the nearest tenI
Round 221 to the nearest hundredD
Round 173 to the nearest tenA
Round 70 to the nearest tenR
Round 2,265 to the nearest hundredL
Round 6,723 to the nearest thousandW
Round 1,687 to the nearest hundredS
Round 319 to the nearest hundredH
Round 226 to the nearest tenO
Round 3,721 to the nearest hundredE
Round 3,311 to the nearest thousandB
Round 949 to the nearest hundredV
Round 48 to the nearest tenG
Round 9,227 to the nearest thousandN
0/15 letters found
Clue 2
Skip counting
To track the thief through the meadow, the scouts counted hoofprints in sets of five.
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
16
36
14
22
12
65
65
65
70
W
16
70
24
12
140
14
27
80
80
140
28
55
36
22
14
22
12
70
55
14
27
12
60
70
14
12
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80A
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, 100O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160F
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80G
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32P
0/14 letters found
Clue 3
Word problems
The head keeper tallied the missing supplies across the feeding troughs.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Someonescaredthevillainoffwith .
B
57
88
20
20
103
56
60
56
70
S
S
Stable Groom found 15 crystal horseshoe nails yesterday and 42 more today. How many crystal horseshoe nails in all?B
Stable Groom found 66 starlight oats yesterday and 4 more today. How many starlight oats in all?A
There were 118 glitter apples. 30 were used up. How many glitter apples are left?I
Stable Groom lined up 2 rows of 10 cloud sugar cubes. How many cloud sugar cubes in all?T
There were 87 glitter apples. 31 were used up. How many glitter apples are left?R
There were 120 sparkle berries. 17 were used up. How many sparkle berries are left?E
Stable Groom lined up 5 rows of 12 cloud sugar cubes. How many cloud sugar cubes in all?G
0/7 letters found
Clue 4
Bar model word problems
The glitter logs showed comparative charts of how much magic dust was used.
Draw a bar model to solve each word problem. Its answer reveals a letter — write the letters in the boxes to fill in the missing word.
Astrandof hairturnedupatthescene.
P
22
55
94
69
133
126
P
22
81
N
K
Stable Groom shares 44 glitter apples equally among 2 teams. How many glitter apples does each team get?
draw a bar model
Answer:→P
Stable Groom has 9 times as many starlight oats as a teammate. The teammate has 9 starlight oats. How many starlight oats does Stable Groom have?
draw a bar model
Answer:→I
Stable Groom used 1/2 of the sparkle berries on the first day. The other 47 sparkle berries were used the next day. How many sparkle berries were there in all?
draw a bar model
Answer:→S
Stable Groom has 110 cloud sugar cubes, packed 2 to a bag. How many bags can be filled?
draw a bar model
Answer:→A
There were 159 crystal horseshoe nails in all. 33 crystal horseshoe nails were used. How many crystal horseshoe nails are left?
draw a bar model
Answer:→L
There were 163 sparkle berries in all. 30 sparkle berries were used. How many sparkle berries are left?
draw a bar model
Answer:→E
Stable Groom shares 138 sparkle berries equally among 2 teams. How many sparkle berries does each team get?
draw a bar model
Answer:→T
0/7 letters found
Clue 5
Missing addends — the last clue
The vault door lock needed the exact missing number of glowing stars to open.
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
4 + ___ = 7
7 + ___ = 19
20 + ___ = 22
21 + ___ = 26
34 + ___ = 41
27 + ___ = 31
36 + ___ = 46
5 + ___ = 6
26 + ___ = 34
32 + ___ = 43
16 + ___ = 22
Step 2 — cross out the sentence with each answer
1.The villain slipped past using moon glow, then rang a loud crystal bell.
2.The villain cast a rainbow shield, then draped a warm velvet blanket.
3.The villain blinded guards with gem sparkle, then rang a loud crystal bell.
4.The villain zipped away with a starlight dash, then tied a shining star ribbon.
5.The villain slipped past using moon glow, then adjusted a golden bridle.
6.The villain floated up using cloud hover, then rang a loud crystal bell.
7.The villain zipped away with a starlight dash, then adjusted a golden bridle.
8.The villain slipped past using moon glow, then draped a warm velvet blanket.
9.The villain zipped away with a starlight dash, then rang a loud crystal bell.
10.The villain slipped past using moon glow, then tied a shining star ribbon.
11.The villain blinded guards with gem sparkle, then strapped on a silver saddle.
12.The villain cast a rainbow shield, then rang a loud crystal bell.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Stolen Crystal Horn
Culprit: Jasper Jewel (Starlight Dash · Crystal Bell · Left Hoof Tap · Pastel Pink · Bitter Grass)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT WEAR A GOLDEN BRIDLE"Round 129 to the nearest ten = 130 (T) · Round 373 to the nearest ten = 370 (I) · Round 221 to the nearest hundred = 200 (D) · Round 173 to the nearest ten = 170 (A) · Round 70 to the nearest ten = 70 (R) · Round 2,265 to the nearest hundred = 2300 (L) · Round 6,723 to the nearest thousand = 7000 (W) · Round 1,687 to the nearest hundred = 1700 (S) · Round 319 to the nearest hundred = 300 (H) · Round 226 to the nearest ten = 230 (O) · Round 3,721 to the nearest hundred = 3700 (E) · Round 3,311 to the nearest thousand = 3000 (B) · Round 949 to the nearest hundred = 900 (V) · Round 48 to the nearest ten = 50 (G) · Round 9,227 to the nearest thousand = 9000 (N)
- Clue 2 (Skip counting): "WITNESS SAW A LEFT HOOF PRINT NEAR THE GATE"Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (A) · 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 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80 = 60 (G) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (P)
- Clue 3 (Word problems): "BITTER GRASS"Stable Groom found 15 crystal horseshoe nails yesterday and 42 more today. How many crystal horseshoe nails in all? = 57 (B) · Stable Groom found 66 starlight oats yesterday and 4 more today. How many starlight oats in all? = 70 (A) · There were 118 glitter apples. 30 were used up. How many glitter apples are left? = 88 (I) · Stable Groom lined up 2 rows of 10 cloud sugar cubes. How many cloud sugar cubes in all? = 20 (T) · There were 87 glitter apples. 31 were used up. How many glitter apples are left? = 56 (R) · There were 120 sparkle berries. 17 were used up. How many sparkle berries are left? = 103 (E) · Stable Groom lined up 5 rows of 12 cloud sugar cubes. How many cloud sugar cubes in all? = 60 (G)
- Clue 4 (Bar model word problems): "PASTEL PINK"Stable Groom shares 44 glitter apples equally among 2 teams. How many glitter apples does each team get? = 22 (P) · Stable Groom has 9 times as many starlight oats as a teammate. The teammate has 9 starlight oats. How many starlight oats does Stable Groom have? = 81 (I) · Stable Groom used 1/2 of the sparkle berries on the first day. The other 47 sparkle berries were used the next day. How many sparkle berries were there in all? = 94 (S) · Stable Groom has 110 cloud sugar cubes, packed 2 to a bag. How many bags can be filled? = 55 (A) · There were 159 crystal horseshoe nails in all. 33 crystal horseshoe nails were used. How many crystal horseshoe nails are left? = 126 (L) · There were 163 sparkle berries in all. 30 sparkle berries were used. How many sparkle berries are left? = 133 (E) · Stable Groom shares 138 sparkle berries equally among 2 teams. How many sparkle berries does each team get? = 69 (T)
- Clue 5 (Missing addends): surviving statement (box 9) → Jasper Jewel4 + ___ = 7 = 3 · 7 + ___ = 19 = 12 · 20 + ___ = 22 = 2 · 21 + ___ = 26 = 5 · 34 + ___ = 41 = 7 · 27 + ___ = 31 = 4 · 36 + ___ = 46 = 10 · 5 + ___ = 6 = 1 · 26 + ___ = 34 = 8 · 32 + ___ = 43 = 11 · 16 + ___ = 22 = 6
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Rounding, Skip counting, Word problems, Bar models, Missing addends
- Reading level
- grades 3-4
- Theme
- The Case of the Stolen Crystal Horn — set in Cloudberry Meadow High Stables
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects