🦄 UnicornsGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Missing Rainbow Prism

Someone has stolen the Rainbow Prism from the Keeper of the Prism in the Sparklewood Canopy! The beautiful trees are turning a dull grey. We must find the sneaky Gloom Mare before all the color fades away forever.

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 Magic	Extra Gear	Nervous Tell	Mane Color	Weakness
Sprinkles	Rainbow Dash	Jewel Saddle	Right Ear Twitch	Blue Mane	Bright Lights
Sunburst	Horn Beam	Golden Shoes	Right Ear Twitch	Blue Mane	Bright Lights
Sapphire	Rainbow Dash	Golden Shoes	Left Ear Twitch	Pink Mane	Bright Lights
Amethyst	Cloud Bounce	Pearl Bridle	Right Ear Twitch	Blue Mane	Loud Bells
Bella	Rainbow Dash	Golden Shoes	Right Ear Twitch	Purple Mane	Bright Lights
Buttercup	Rainbow Dash	Pearl Bridle	Right Ear Twitch	Pink Mane	Sweet Apples
Blossom	Horn Beam	Jewel Saddle	Left Ear Twitch	Blue Mane	Sweet Apples
Breezy	Horn Beam	Silver Bell	Left Ear Twitch	Pink Mane	Loud Bells
Prism	Cloud Bounce	Silver Bell	Right Ear Twitch	Purple Mane	Loud Bells
Celestia	Horn Beam	Silver Bell	Right Ear Twitch	Pink Mane	Bright Lights
Twinkle	Glitter Blast	Golden Shoes	Left Ear Twitch	Blue Mane	Bright Lights
Skye	Cloud Bounce	Silver Bell	Left Ear Twitch	Blue Mane	Sweet Apples
Sparks	Star Shield	Pearl Bridle	Left Ear Twitch	Blue Mane	Bright Lights
Waffles	Glitter Blast	Silver Bell	Left Ear Twitch	Purple Mane	Sweet Apples
Nova	Glitter Blast	Jewel Saddle	Right Ear Twitch	Blue Mane	Sweet Apples
Starbuck	Cloud Bounce	Jewel Saddle	Right Ear Twitch	Purple Mane	Bright Lights
Daisy	Star Shield	Jewel Saddle	Right Ear Twitch	Blue Mane	Bright Lights
Barnaby	Horn Beam	Crystal Crown	Right Ear Twitch	Blue Mane	Bright Lights
Pip	Star Shield	Jewel Saddle	Right Ear Twitch	Pink Mane	Sweet Apples
Sherbet	Star Shield	Golden Shoes	Right Ear Twitch	Purple Mane	Bright Lights
Glimmer	Star Shield	Golden Shoes	Right Ear Twitch	Blue Mane	Bright Lights

Clue 1

Rounding

The magical radar screen only shows rounded numbers. Round the spark distance to the nearest ten to find where the suspect dropped their extra gear.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

110

370

2900

230

2300

430

300

2300

5000

1100

4300

2900

290

5000

4300

110

1700

2900

300

1300

300

1300

7000

290

110

300

430

1300

4300

1700

5000

Round 114 to the nearest tenT

Round 2,335 to the nearest hundredI

Round 7,141 to the nearest thousandY

Round 288 to the nearest tenS

Round 1,731 to the nearest hundredW

Round 306 to the nearest hundredA

Round 2,912 to the nearest hundredE

Round 366 to the nearest tenH

Round 4,257 to the nearest hundredO

Round 228 to the nearest tenV

Round 1,092 to the nearest hundredD

Round 1,292 to the nearest hundredR

Round 92 to the nearest tenC

Round 4,556 to the nearest thousandN

Round 429 to the nearest tenL

0/15 letters found

Clue 2

Addition

We found piles of glowing magic gems dropped in the meadow. Add all the gems together to see how many clue details were left behind.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

3328

8357

8264

8919

8539

8919

8710

8264

2551

3328

8919

8792

6937

7730

8357

3328

8264

5938

8792

2023

5938

8919

3328

2023

6937

3328

2551

8357

6937

8425

7730

1591 + 1737 =T

1698 + 853 =C

5274 + 3083 =H

2511 + 3427 =A

3919 + 3811 =G

4697 + 2240 =I

4109 + 4430 =U

3730 + 4534 =E

4459 + 4333 =R

4502 + 4208 =P

1075 + 948 =W

5332 + 3093 =N

3675 + 5244 =S

0/13 letters found

Clue 3

Subtraction

The pixie counted the sparkling horseshoes left in the royal stable. Subtract the stolen shoes from the starting total to get the next scoop.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

7152

2484

5190

5304

7189

5493

5211

7189

7053

4705

5211

7053

5211

7250

5211

2877

2893

4705

5884

2791

4862

4705

7189

2733

2484

7152

5493

7189

2733

2484

7152

8107

8156 - 1004 =T

3038 - 247 =M

7115 - 62 =N

6458 - 1753 =R

6503 - 3610 =F

6110 - 1248 =B

8481 - 2597 =O

3125 - 392 =G

8597 - 3293 =V

8173 - 2962 =A

9253 - 4063 =E

6818 - 1325 =L

9525 - 2336 =I

3464 - 980 =H

6194 - 3317 =Y

8465 - 1215 =W

12624 - 4517 =S

0/17 letters found

Clue 4

Multiplication facts (1-12)

Rainbow trees grow in perfect rows in the orchard. Multiply the rows of trees to figure out the path the suspect took.

Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.

120

100

120

108

7 × 5 =W

1 × 10 =E

3 × 10 =D

12 × 2 =N

11 × 5 =H

11 × 6 =T

2 × 7 =S

9 × 1 =F

5 × 5 =R

10 × 10 =L

12 × 10 =U

12 × 9 =A

4 × 7 =C

7 × 7 =I

1 × 5 =O

11 × 8 =B

6 × 7 =M

0/17 letters found

Clue 5

Division facts (1-12) — the last clue

We must share the sparkling sugar cubes equally among the forest sprites. Divide the treats to get the final clue about the villain.

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 ÷ 2 = ?

24 ÷ 2 = ?

6 ÷ 1 = ?

10 ÷ 10 = ?

12 ÷ 6 = ?

36 ÷ 9 = ?

96 ÷ 12 = ?

55 ÷ 11 = ?

70 ÷ 10 = ?

99 ÷ 11 = ?

33 ÷ 3 = ?

Step 2 — cross out the sentence with each answer

1.The villain fires a bright horn beam, then loses a crystal crown.

2.The villain blasts rainbow glitter, then rings a silver bell.

3.The villain creates a starry shield, then clatters away in golden shoes.

4.The villain fires a bright horn beam, then adjusts a jewel saddle.

5.The villain fires a bright horn beam, then shakes a pearl bridle.

6.The villain creates a starry shield, then adjusts a jewel saddle.

7.The villain bounces high on a cloud, then shakes a pearl bridle.

8.The villain creates a starry shield, then shakes a pearl bridle.

9.The villain bounces high on a cloud, then clatters away in golden shoes.

10.The villain fires a bright horn beam, then clatters away in golden shoes.

11.The villain bounces high on a cloud, then adjusts a jewel saddle.

12.The villain zooms on a rainbow path, then adjusts a jewel saddle.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Case of the Missing Rainbow Prism

Culprit: Sunburst (Horn Beam · Golden Shoes · Right Ear Twitch · Blue Mane · Bright Lights)

Clue 1 (Rounding): "THE VILLAIN DOES NOT WEAR A CRYSTAL CROWN"
Round 114 to the nearest ten = 110 (T) · Round 2,335 to the nearest hundred = 2300 (I) · Round 7,141 to the nearest thousand = 7000 (Y) · Round 288 to the nearest ten = 290 (S) · Round 1,731 to the nearest hundred = 1700 (W) · Round 306 to the nearest hundred = 300 (A) · Round 2,912 to the nearest hundred = 2900 (E) · Round 366 to the nearest ten = 370 (H) · Round 4,257 to the nearest hundred = 4300 (O) · Round 228 to the nearest ten = 230 (V) · Round 1,092 to the nearest hundred = 1100 (D) · Round 1,292 to the nearest hundred = 1300 (R) · Round 92 to the nearest ten = 90 (C) · Round 4,556 to the nearest thousand = 5000 (N) · Round 429 to the nearest ten = 430 (L)
Clue 2 (Addition): "THE SUSPECTS RIGHT EAR WAS TWITCHING"
1591 + 1737 = 3328 (T) · 1698 + 853 = 2551 (C) · 5274 + 3083 = 8357 (H) · 2511 + 3427 = 5938 (A) · 3919 + 3811 = 7730 (G) · 4697 + 2240 = 6937 (I) · 4109 + 4430 = 8539 (U) · 3730 + 4534 = 8264 (E) · 4459 + 4333 = 8792 (R) · 4502 + 4208 = 8710 (P) · 1075 + 948 = 2023 (W) · 5332 + 3093 = 8425 (N) · 3675 + 5244 = 8919 (S)
Clue 3 (Subtraction): "THE VILLAIN RAN AWAY FROM BRIGHT LIGHTS"
8156 - 1004 = 7152 (T) · 3038 - 247 = 2791 (M) · 7115 - 62 = 7053 (N) · 6458 - 1753 = 4705 (R) · 6503 - 3610 = 2893 (F) · 6110 - 1248 = 4862 (B) · 8481 - 2597 = 5884 (O) · 3125 - 392 = 2733 (G) · 8597 - 3293 = 5304 (V) · 8173 - 2962 = 5211 (A) · 9253 - 4063 = 5190 (E) · 6818 - 1325 = 5493 (L) · 9525 - 2336 = 7189 (I) · 3464 - 980 = 2484 (H) · 6194 - 3317 = 2877 (Y) · 8465 - 1215 = 7250 (W) · 12624 - 4517 = 8107 (S)
Clue 4 (Multiplication facts (1-12)): "WE FOUND BLUE MANE HAIR AT THE SCENE"
7 × 5 = 35 (W) · 1 × 10 = 10 (E) · 3 × 10 = 30 (D) · 12 × 2 = 24 (N) · 11 × 5 = 55 (H) · 11 × 6 = 66 (T) · 2 × 7 = 14 (S) · 9 × 1 = 9 (F) · 5 × 5 = 25 (R) · 10 × 10 = 100 (L) · 12 × 10 = 120 (U) · 12 × 9 = 108 (A) · 4 × 7 = 28 (C) · 7 × 7 = 49 (I) · 1 × 5 = 5 (O) · 11 × 8 = 88 (B) · 6 × 7 = 42 (M)
Clue 5 (Division facts (1-12)): surviving statement (box 10) → Sunburst
6 ÷ 2 = 3 · 24 ÷ 2 = 12 · 6 ÷ 1 = 6 · 10 ÷ 10 = 1 · 12 ÷ 6 = 2 · 36 ÷ 9 = 4 · 96 ÷ 12 = 8 · 55 ÷ 11 = 5 · 70 ÷ 10 = 7 · 99 ÷ 11 = 9 · 33 ÷ 3 = 11

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Case of the Missing Rainbow Prism — set in the Sparklewood Canopy
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

More free printable math mysteries

4th grade worksheets Addition worksheets Subtraction worksheets Multiplication worksheets Division worksheets Rounding worksheets All worksheets →

The Great Shipwreck Shootout

Grade 4

The Zero Point Heist

Grade 4

The Cloud Haven Compass Heist

Grade 4

The Whispering Jungle Mystery

Grade 4