Grade 4Reading: grades 3-4SubtractionRoundingAdditionMultiplicationDivision

The Mystery of the Whispering Ruins

Someone snuck into the expedition tent at midnight and snatched the ancient golden compass! Match the clues to find out who stole the artifact.

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	Primary Gear	Special Gadget	Dominant Hand	Hair Style	Vulnerability
Ivy	Smoke Bomb	Sonic Whistle	Left Handed	Blonde Messy Hair	Bright Light
Ruby	Glider Wings	Sonic Whistle	Left Handed	Blonde Messy Hair	Bright Light
Lily	Smoke Bomb	Flash Flare	Right Handed	Blonde Messy Hair	Bright Light
Cole	Compass Map	Flash Flare	Left Handed	Black Ponytail	Bright Light
Owen	Torch Lantern	Flash Flare	Left Handed	Black Ponytail	Loud Whistle
Finn	Grappling Hook	Decoy Whistle	Left Handed	Black Ponytail	Loud Whistle
Maya	Torch Lantern	Decoy Whistle	Left Handed	Red Braids	Cold Water
Zoe	Grappling Hook	Sonic Whistle	Left Handed	Blonde Messy Hair	Cold Water
Nora	Compass Map	Decoy Whistle	Left Handed	Red Braids	Bright Light
Eva	Compass Map	Radar Tracker	Left Handed	Blonde Messy Hair	Bright Light
Luke	Smoke Bomb	Sonic Whistle	Right Handed	Black Ponytail	Bright Light
Mia	Compass Map	Flash Flare	Right Handed	Red Braids	Loud Whistle
Mason	Compass Map	Sonic Whistle	Left Handed	Blonde Messy Hair	Loud Whistle
Ella	Torch Lantern	Sonic Whistle	Left Handed	Black Ponytail	Cold Water
Zara	Compass Map	Sonic Whistle	Right Handed	Red Braids	Bright Light
Sam	Smoke Bomb	Decoy Whistle	Left Handed	Red Braids	Bright Light
Kai	Torch Lantern	Sonic Whistle	Left Handed	Blonde Messy Hair	Bright Light
Noah	Torch Lantern	Decoy Whistle	Left Handed	Blonde Messy Hair	Bright Light
Leo	Torch Lantern	Flash Flare	Right Handed	Red Braids	Cold Water
Max	Smoke Bomb	Sonic Whistle	Right Handed	Black Ponytail	Loud Whistle
Aria	Torch Lantern	Night Vision	Left Handed	Black Ponytail	Bright Light

Clue 1

Subtraction

You calculate how many supplies are left in the camp pack after the intruder escaped.

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

1608

1822

7883

7756

4144

6348

7669

4144

5027

2886

6039

7883

2038

5027

6039

1608

5750

2038

7883

7995

7669

2886

7669

7995

1608

7995

7669

4954

4816

7883

7995

5133 - 3525 =T

8181 - 4037 =I

9179 - 4363 =K

6039 - 4217 =H

9245 - 1576 =A

9495 - 3147 =L

9134 - 1378 =V

5278 - 324 =C

12875 - 4992 =E

3893 - 1007 =D

8546 - 2507 =O

9526 - 1531 =R

8457 - 3430 =N

8550 - 2800 =U

3986 - 1948 =S

0/15 letters found

Clue 2

Rounding

The digital camp scanner rounds the total footprint readings to the nearest hundred.

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

170

1100

2300

430

1700

5000

130

430

370

1100

110

5000

2300

300

430

300

1100

700

5000

3000

1700

Round 16 to the nearest tenW

Round 428 to the nearest tenE

Round 728 to the nearest hundredR

Round 373 to the nearest tenF

Round 1,117 to the nearest hundredT

Round 74 to the nearest tenC

Round 2,303 to the nearest hundredN

Round 132 to the nearest tenL

Round 2,651 to the nearest thousandK

Round 4,599 to the nearest thousandA

Round 168 to the nearest tenI

Round 315 to the nearest hundredD

Round 109 to the nearest tenH

Round 1,660 to the nearest hundredS

0/14 letters found

Clue 3

Addition

You add up all the missing golden coins found along the jungle trail.

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

9162

5844

8194

5911

7313

5911

6692

8957

2482

6651

6017

2482

4762

6692

5980

7877

6447

6651

6017

6325

5911

6447

9162

6017

6651

5143

6447

9162

6017

6651

4706 + 4456 =G

4297 + 2354 =T

1903 + 4008 =R

1960 + 4057 =H

1847 + 2915 =M

3774 + 2070 =U

2125 + 3855 =F

4698 + 3179 =W

4667 + 4290 =V

3582 + 4612 =A

4521 + 2171 =O

4320 + 2993 =D

2279 + 2864 =L

4177 + 2270 =I

2408 + 3917 =B

1164 + 1318 =E

0/16 letters found

Clue 4

Multiplication facts (1-12)

You count the rows of ancient stone tiles leading to the inner temple chamber.

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

132

121

4 × 11 =B

7 × 2 =L

3 × 3 =E

5 × 7 =U

6 × 5 =Z

8 × 12 =O

7 × 6 =T

12 × 11 =H

4 × 8 =D

4 × 3 =R

9 × 10 =P

7 × 4 =F

12 × 2 =N

11 × 11 =I

10 × 7 =A

0/15 letters found

Clue 5

Division facts (1-12) — the last clue

You split the recovered map scraps equally among the junior explorer teams.

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

70 ÷ 10 = ?

6 ÷ 2 = ?

4 ÷ 2 = ?

30 ÷ 5 = ?

100 ÷ 10 = ?

36 ÷ 3 = ?

32 ÷ 4 = ?

63 ÷ 7 = ?

10 ÷ 2 = ?

16 ÷ 4 = ?

3 ÷ 3 = ?

Step 2 — cross out the sentence with each answer

1.The villain soared over the treetops on glider wings, then fooled the guards using a decoy whistle.

2.The villain soared over the treetops on glider wings, then called trained parrots with a sonic whistle.

3.The villain vanished in a cloud using a smoke bomb, then called trained parrots with a sonic whistle.

4.The villain navigated the maze using a compass map, then scouted ahead using night vision.

5.The villain swung across the chasm with a grappling hook, then called trained parrots with a sonic whistle.

6.The villain lit up the dark cavern with a torch lantern, then monitored the ruins with a radar tracker.

7.The villain lit up the dark cavern with a torch lantern, then called trained parrots with a sonic whistle.

8.The villain navigated the maze using a compass map, then called trained parrots with a sonic whistle.

9.The villain swung across the chasm with a grappling hook, then scouted ahead using night vision.

10.The villain vanished in a cloud using a smoke bomb, then scouted ahead using night vision.

11.The villain lit up the dark cavern with a torch lantern, then fooled the guards using a decoy whistle.

12.The villain soared over the treetops on glider wings, then monitored the ruins with a radar tracker.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of the Whispering Ruins

Culprit: Noah (Torch Lantern · Decoy Whistle · Left Handed · Blonde Messy Hair · Bright Light)

Clue 1 (Subtraction): "THE VILLAIN DOES NOT USE RADAR TRACKER"
5133 - 3525 = 1608 (T) · 8181 - 4037 = 4144 (I) · 9179 - 4363 = 4816 (K) · 6039 - 4217 = 1822 (H) · 9245 - 1576 = 7669 (A) · 9495 - 3147 = 6348 (L) · 9134 - 1378 = 7756 (V) · 5278 - 324 = 4954 (C) · 12875 - 4992 = 7883 (E) · 3893 - 1007 = 2886 (D) · 8546 - 2507 = 6039 (O) · 9526 - 1531 = 7995 (R) · 8457 - 3430 = 5027 (N) · 8550 - 2800 = 5750 (U) · 3986 - 1948 = 2038 (S)
Clue 2 (Rounding): "WITNESS SAW LEFT HANDED TRACKS"
Round 16 to the nearest ten = 20 (W) · Round 428 to the nearest ten = 430 (E) · Round 728 to the nearest hundred = 700 (R) · Round 373 to the nearest ten = 370 (F) · Round 1,117 to the nearest hundred = 1100 (T) · Round 74 to the nearest ten = 70 (C) · Round 2,303 to the nearest hundred = 2300 (N) · Round 132 to the nearest ten = 130 (L) · Round 2,651 to the nearest thousand = 3000 (K) · Round 4,599 to the nearest thousand = 5000 (A) · Round 168 to the nearest ten = 170 (I) · Round 315 to the nearest hundred = 300 (D) · Round 109 to the nearest ten = 110 (H) · Round 1,660 to the nearest hundred = 1700 (S)
Clue 3 (Addition): "GUARD DROVE THEM OFF WITH BRIGHT LIGHT"
4706 + 4456 = 9162 (G) · 4297 + 2354 = 6651 (T) · 1903 + 4008 = 5911 (R) · 1960 + 4057 = 6017 (H) · 1847 + 2915 = 4762 (M) · 3774 + 2070 = 5844 (U) · 2125 + 3855 = 5980 (F) · 4698 + 3179 = 7877 (W) · 4667 + 4290 = 8957 (V) · 3582 + 4612 = 8194 (A) · 4521 + 2171 = 6692 (O) · 4320 + 2993 = 7313 (D) · 2279 + 2864 = 5143 (L) · 4177 + 2270 = 6447 (I) · 2408 + 3917 = 6325 (B) · 1164 + 1318 = 2482 (E)
Clue 4 (Multiplication facts (1-12)): "BLONDE HAIR FOUND ON TENT ZIPPER"
4 × 11 = 44 (B) · 7 × 2 = 14 (L) · 3 × 3 = 9 (E) · 5 × 7 = 35 (U) · 6 × 5 = 30 (Z) · 8 × 12 = 96 (O) · 7 × 6 = 42 (T) · 12 × 11 = 132 (H) · 4 × 8 = 32 (D) · 4 × 3 = 12 (R) · 9 × 10 = 90 (P) · 7 × 4 = 28 (F) · 12 × 2 = 24 (N) · 11 × 11 = 121 (I) · 10 × 7 = 70 (A)
Clue 5 (Division facts (1-12)): surviving statement (box 11) → Noah
70 ÷ 10 = 7 · 6 ÷ 2 = 3 · 4 ÷ 2 = 2 · 30 ÷ 5 = 6 · 100 ÷ 10 = 10 · 36 ÷ 3 = 12 · 32 ÷ 4 = 8 · 63 ÷ 7 = 9 · 10 ÷ 2 = 5 · 16 ÷ 4 = 4 · 3 ÷ 3 = 1

About this mystery

Grade level: Grade 4 math
Math topics: Subtraction, Rounding, Addition, Multiplication, Division
Reading level: grades 3-4
Theme: The Mystery of the Whispering Ruins — set in Deep inside the uncharted Jade Jungle
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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