🦄 UnicornsGrade 4Reading: grades 3-4RoundingBar modelsAdditionSubtractionDivision
The Case of the Missing Star Crystal
Someone snuck into the Enchanted Cloud Meadow and snatched the Star Crystal right off the altar! Detective Hoof is on the case to find out which unicorn did 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 | Magic Beam | Special Trick | Hoof Lead | Mane Color | Allergy |
|---|---|---|---|---|---|
| Prism Dancer | Cloud Jump | Sugar Swirl | Left Hoofed | Pink Mane | Soggy Marshmallows |
| Crystal Gallop | Rainbow Beam | Sugar Swirl | Left Hoofed | Golden Mane | Soggy Marshmallows |
| Sparkle Star | Starlight Shield | Floral Ring | Left Hoofed | Silver Mane | Dull Stones |
| Blossom Bound | Sun Sparkle | Sugar Swirl | Right Hoofed | Golden Mane | Dull Stones |
| Glimmer Hoof | Sun Sparkle | Floral Ring | Right Hoofed | Silver Mane | Sour Berries |
| Cloud Jumper | Sun Sparkle | Glitter Blast | Left Hoofed | Pink Mane | Sour Berries |
| Twinkle Horn | Starlight Shield | Moon Dust | Right Hoofed | Golden Mane | Soggy Marshmallows |
| Rainbow Dash | Starlight Shield | Moon Dust | Left Hoofed | Golden Mane | Dull Stones |
| Petal Sprinter | Sun Sparkle | Floral Ring | Right Hoofed | Golden Mane | Sour Berries |
| Moonlight Echo | Rainbow Beam | Floral Ring | Left Hoofed | Golden Mane | Soggy Marshmallows |
| Jewel Canter | Rainbow Beam | Floral Ring | Right Hoofed | Silver Mane | Dull Stones |
| Dewdrop Trot | Crystal Dash | Prism Burst | Right Hoofed | Pink Mane | Soggy Marshmallows |
| Sunburst Tail | Rainbow Beam | Moon Dust | Left Hoofed | Golden Mane | Sour Berries |
| Golden Glade | Starlight Shield | Moon Dust | Right Hoofed | Golden Mane | Sour Berries |
| Starlight Whisper | Crystal Dash | Prism Burst | Left Hoofed | Silver Mane | Dull Stones |
| Silver Streak | Rainbow Beam | Prism Burst | Right Hoofed | Golden Mane | Sour Berries |
| Astral Wanderer | Crystal Dash | Glitter Blast | Left Hoofed | Silver Mane | Dull Stones |
| Dawn Trotter | Sun Sparkle | Sugar Swirl | Left Hoofed | Golden Mane | Soggy Marshmallows |
| Radiant Meadow | Starlight Shield | Floral Ring | Left Hoofed | Pink Mane | Soggy Marshmallows |
| Glitter Mane | Sun Sparkle | Moon Dust | Left Hoofed | Golden Mane | Soggy Marshmallows |
| Shimmer Breeze | Rainbow Beam | Glitter Blast | Left Hoofed | Golden Mane | Soggy Marshmallows |
Clue 1
Rounding
To see who was near the altar, Detective Hoof draws bar models comparing the lengths of magical trails left in the grass.
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
300
70
290
430
1100
430
7000
290
700
T
300
110
130
290
430
2900
130
T
300
1100
430
290
1700
2300
50
T
300
T
300
290
1300
200
2300
170
430
T
300
Round 264 to the nearest hundredT
Round 2,252 to the nearest hundredL
Round 709 to the nearest hundredC
Round 1,729 to the nearest hundredG
Round 169 to the nearest tenA
Round 1,287 to the nearest hundredR
Round 2,904 to the nearest hundredN
Round 153 to the nearest hundredB
Round 128 to the nearest tenO
Round 67 to the nearest tenH
Round 6,655 to the nearest thousandP
Round 46 to the nearest tenI
Round 110 to the nearest tenD
Round 428 to the nearest tenS
Round 1,125 to the nearest hundredU
Round 290 to the nearest tenE
0/16 letters found
Clue 2
Bar model word problems
A magical sensor scanner checks power levels, but its glowing screen only shows rounded estimates.
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.
Awitnesssawthevillainwas.
L
132
59
61
71
47
83
83
61
59
93
The red team has 159 cloud marshmallows and the blue team has 27 cloud marshmallows. How many more cloud marshmallows does the red team have?
draw a bar model
Answer:→L
One group collected 30 sugar gems and another group collected 17 sugar gems. How many sugar gems in all?
draw a bar model
Answer:→H
There were 96 glitter oats in all. 37 glitter oats were used. How many glitter oats are left?
draw a bar model
Answer:→E
One group collected 56 magic berries and another group collected 5 magic berries. How many magic berries in all?
draw a bar model
Answer:→F
One group collected 2 cloud marshmallows and another group collected 81 cloud marshmallows. How many cloud marshmallows in all?
draw a bar model
Answer:→O
There were 98 magic berries in all. 27 magic berries were used. How many magic berries are left?
draw a bar model
Answer:→T
One group collected 53 cloud marshmallows and another group collected 40 cloud marshmallows. How many cloud marshmallows in all?
draw a bar model
Answer:→D
0/7 letters found
Clue 3
Addition
The detective totals up all the fallen sugar crystals gathered from the scene to count the clue points.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
S
8343
7778
8779
8779
4758
3351
3606
2868
S
8343
7181
3351
3606
7598
7598
7778
8268
S
8343
S
8343
9140
7778
5163
5163
9011
7137
9140
7181
9011
S
8343
5304
9011
3606
6984
2325
7778
7598
7137
2645 + 5698 =S
2561 + 5037 =L
1000 + 1325 =C
1660 + 1208 =R
5251 + 3889 =T
4618 + 2563 =H
1565 + 3193 =Y
2939 + 2224 =P
4647 + 4364 =E
3071 + 2233 =N
2800 + 5468 =W
2807 + 4330 =D
2282 + 1324 =A
4244 + 3534 =O
1209 + 2142 =M
6087 + 2692 =G
3061 + 3923 =K
0/17 letters found
Clue 4
Subtraction
Detective Hoof subtracts the baseline magic energy from the meadow total to find the leftover energy.
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
2953
8146
6016
3984
3283
2907
4237
8146
8146
3984
6016
2679
1504
4237
8287
A
2953
4237
1504
2647
A
2953
2907
2352
3283
A
2953
5177
2907
4237
4061
2647
1504
8146
2352
A
2953
5177
5177
4712 - 1759 =A
6234 - 1997 =N
5471 - 2792 =D
4942 - 2590 =R
5339 - 162 =S
2495 - 991 =E
9329 - 1183 =G
8963 - 2947 =L
3901 - 994 =I
12241 - 3954 =M
7497 - 3436 =T
4989 - 1706 =W
5189 - 2542 =H
6938 - 2954 =O
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
The guard divides the total star fruit treat snacks into equal portions for the detective team.
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
54 ÷ 9 = ?
6 ÷ 6 = ?
22 ÷ 2 = ?
21 ÷ 7 = ?
35 ÷ 7 = ?
80 ÷ 8 = ?
28 ÷ 7 = ?
4 ÷ 2 = ?
36 ÷ 4 = ?
32 ÷ 4 = ?
42 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain blasted a rainbow beam, then swirled sugar cloud dust.
2.The villain performed a cloud jump, then fired a prism burst.
3.The villain flashed a sun sparkle, then created a floral ring.
4.The villain raised a starlight shield, then sprinkled moon dust everywhere.
5.The villain blasted a rainbow beam, then fired a prism burst.
6.The villain blasted a rainbow beam, then created a floral ring.
7.The villain flashed a sun sparkle, then fired a prism burst.
8.The villain performed a cloud jump, then sprinkled moon dust everywhere.
9.The villain blasted a rainbow beam, then sprinkled moon dust everywhere.
10.The villain made a crystal dash, then swirled sugar cloud dust.
11.The villain flashed a sun sparkle, then sprinkled moon dust everywhere.
12.The villain flashed a sun sparkle, then swirled sugar cloud dust.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Star Crystal
Culprit: Dawn Trotter (Sun Sparkle · Sugar Swirl · Left Hoofed · Golden Mane · Soggy Marshmallows)
- Clue 1 (Rounding): "THE SUSPECT DOES NOT USE GLITTER BLAST"Round 264 to the nearest hundred = 300 (T) · Round 2,252 to the nearest hundred = 2300 (L) · Round 709 to the nearest hundred = 700 (C) · Round 1,729 to the nearest hundred = 1700 (G) · Round 169 to the nearest ten = 170 (A) · Round 1,287 to the nearest hundred = 1300 (R) · Round 2,904 to the nearest hundred = 2900 (N) · Round 153 to the nearest hundred = 200 (B) · Round 128 to the nearest ten = 130 (O) · Round 67 to the nearest ten = 70 (H) · Round 6,655 to the nearest thousand = 7000 (P) · Round 46 to the nearest ten = 50 (I) · Round 110 to the nearest ten = 110 (D) · Round 428 to the nearest ten = 430 (S) · Round 1,125 to the nearest hundred = 1100 (U) · Round 290 to the nearest ten = 290 (E)
- Clue 2 (Bar model word problems): "LEFT HOOFED"The red team has 159 cloud marshmallows and the blue team has 27 cloud marshmallows. How many more cloud marshmallows does the red team have? = 132 (L) · One group collected 30 sugar gems and another group collected 17 sugar gems. How many sugar gems in all? = 47 (H) · There were 96 glitter oats in all. 37 glitter oats were used. How many glitter oats are left? = 59 (E) · One group collected 56 magic berries and another group collected 5 magic berries. How many magic berries in all? = 61 (F) · One group collected 2 cloud marshmallows and another group collected 81 cloud marshmallows. How many cloud marshmallows in all? = 83 (O) · There were 98 magic berries in all. 27 magic berries were used. How many magic berries are left? = 71 (T) · One group collected 53 cloud marshmallows and another group collected 40 cloud marshmallows. How many cloud marshmallows in all? = 93 (D)
- Clue 3 (Addition): "SOGGY MARSHMALLOWS STOPPED THE SNEAK COLD"2645 + 5698 = 8343 (S) · 2561 + 5037 = 7598 (L) · 1000 + 1325 = 2325 (C) · 1660 + 1208 = 2868 (R) · 5251 + 3889 = 9140 (T) · 4618 + 2563 = 7181 (H) · 1565 + 3193 = 4758 (Y) · 2939 + 2224 = 5163 (P) · 4647 + 4364 = 9011 (E) · 3071 + 2233 = 5304 (N) · 2800 + 5468 = 8268 (W) · 2807 + 4330 = 7137 (D) · 2282 + 1324 = 3606 (A) · 4244 + 3534 = 7778 (O) · 1209 + 2142 = 3351 (M) · 6087 + 2692 = 8779 (G) · 3061 + 3923 = 6984 (K)
- Clue 4 (Subtraction): "A GLOWING GOLDEN MANE HAIR WAS IN THE GRASS"4712 - 1759 = 2953 (A) · 6234 - 1997 = 4237 (N) · 5471 - 2792 = 2679 (D) · 4942 - 2590 = 2352 (R) · 5339 - 162 = 5177 (S) · 2495 - 991 = 1504 (E) · 9329 - 1183 = 8146 (G) · 8963 - 2947 = 6016 (L) · 3901 - 994 = 2907 (I) · 12241 - 3954 = 8287 (M) · 7497 - 3436 = 4061 (T) · 4989 - 1706 = 3283 (W) · 5189 - 2542 = 2647 (H) · 6938 - 2954 = 3984 (O)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Dawn Trotter54 ÷ 9 = 6 · 6 ÷ 6 = 1 · 22 ÷ 2 = 11 · 21 ÷ 7 = 3 · 35 ÷ 7 = 5 · 80 ÷ 8 = 10 · 28 ÷ 7 = 4 · 4 ÷ 2 = 2 · 36 ÷ 4 = 9 · 32 ÷ 4 = 8 · 42 ÷ 6 = 7
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Bar models, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Star Crystal — set in The Enchanted Cloud Meadow
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects