Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Mystery of Golden Skull Island

Someone snuck into camp on Golden Skull Island and swiped the ancient sun idol! Use your explorer skills and solve the clues to catch the villain.

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	Traversal Gear	Explorer Tool	Dominant Hand	Hairstyle	Secret Weakness
Luke Pathfinder	rope launcher	flash lantern	right handed	blonde spiked	loud cymbals
Maya Croft	smoke bombs	sonic whistle	left handed	black slicked	peppermint spray
Ruby Flint	grappling hook	pocket drone	left handed	black slicked	peppermint spray
Sam Horizon	glider wings	flash lantern	right handed	black slicked	loud cymbals
Liam Cross	stealth boots	night vision	right handed	blonde spiked	bright mirror
Nora Canyon	rope launcher	night vision	right handed	blonde spiked	loud cymbals
Nina Breeze	stealth boots	flash lantern	left handed	black slicked	loud cymbals
Zoe Wilder	glider wings	map compass	left handed	blonde spiked	peppermint spray
Mia Frost	glider wings	sonic whistle	right handed	black slicked	loud cymbals
Leo Vance	smoke bombs	map compass	right handed	brown braided	loud cymbals
Ella Horizon	glider wings	sonic whistle	left handed	black slicked	bright mirror
Noah Finch	rope launcher	pocket drone	left handed	blonde spiked	loud cymbals
Tara Ridge	rope launcher	map compass	left handed	blonde spiked	loud cymbals
Jack Compass	stealth boots	pocket drone	right handed	brown braided	peppermint spray
Chloe Stone	stealth boots	map compass	right handed	black slicked	bright mirror
Cole Trekker	rope launcher	sonic whistle	left handed	brown braided	peppermint spray
Ivy Sterling	rope launcher	night vision	right handed	black slicked	loud cymbals
Ava Ranger	glider wings	map compass	right handed	black slicked	loud cymbals
Zack Valleys	rope launcher	map compass	right handed	black slicked	bright mirror
Alex Rivers	grappling hook	map compass	right handed	brown braided	bright mirror
Eli Drake	grappling hook	pocket drone	right handed	black slicked	loud cymbals

Clue 1

Rounding

The digital scanner on the temple gate only shows rounded numbers.

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

2000

3000

9000

2900

230

9000

900

4300

900

230

3700

2000

1300

9000

2900

230

1300

2000

2900

9000

900

2900

1300

230

3700

430

110

3000

3700

2900

2000

1100

9000

Round 1,526 to the nearest thousandT

Round 859 to the nearest hundredA

Round 92 to the nearest tenD

Round 434 to the nearest tenC

Round 2,859 to the nearest hundredS

Round 34 to the nearest tenK

Round 4,274 to the nearest hundredY

Round 1,294 to the nearest hundredO

Round 232 to the nearest tenN

Round 17 to the nearest tenU

Round 3,666 to the nearest hundredI

Round 3,478 to the nearest thousandH

Round 112 to the nearest tenW

Round 8,900 to the nearest thousandE

Round 48 to the nearest tenB

Round 1,113 to the nearest hundredL

0/16 letters found

Clue 2

Addition

You gather up the dropped jungle trail tokens to count the total.

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

5677

7220

2891

2089

8679

9052

6728

6953

5677

4373

9082

2891

6728

8679

2586

6953

5275

7220

5677

7220

8679

9052

6728

5275

2586

6953

5838

4491

9052

5677

7220

2891

6284

4491

7084

9008

2189 + 3488 =T

1837 + 1054 =E

2582 + 3702 =L

2544 + 1947 =O

4366 + 2854 =H

2196 + 3642 =P

3519 + 3434 =I

1049 + 1040 =B

1721 + 865 =R

3866 + 5186 =N

2829 + 1544 =U

4451 + 4228 =A

4123 + 4959 =S

2501 + 4227 =D

4034 + 3050 =C

4648 + 4360 =K

2130 + 3145 =G

0/17 letters found

Clue 3

Subtraction

You compare the remaining supplies to find out what was taken.

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

1187

2962

2325

1495

2089

4064

1781

2224

5730

1187

3491

1781

5730

1495

2470

6407

3346

2470

2224

5730

8820

1495

6100

6407

2089

2962

7290

2470

3521

6407

3346

2470

6100

3521

2470

5730

3521

3491

2729 - 1542 =L

6985 - 2921 =Y

13170 - 4350 =N

8271 - 2541 =A

5223 - 2753 =E

3019 - 1524 =D

5509 - 2163 =H

3601 - 1512 =C

7949 - 1542 =T

5923 - 3699 =B

9289 - 3189 =I

6573 - 4792 =M

7123 - 3602 =R

6282 - 3957 =U

7592 - 4630 =O

4057 - 566 =S

8670 - 1380 =V

0/17 letters found

Clue 4

Multiplication facts (1-12)

You examine identical rows of ancient stone tiles along the path.

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

11 × 2 =B

7 × 5 =H

4 × 2 =I

2 × 7 =D

5 × 9 =F

8 × 4 =W

4 × 7 =R

10 × 7 =S

5 × 5 =K

4 × 12 =A

9 × 10 =N

3 × 6 =T

3 × 12 =E

7 × 1 =C

6 × 7 =L

5 × 4 =O

11 × 8 =U

0/17 letters found

Clue 5

Division facts (1-12) — the last clue

You split the recovered gold coins equally among the expedition tents.

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

10 ÷ 1 = ?

12 ÷ 3 = ?

7 ÷ 7 = ?

9 ÷ 3 = ?

7 ÷ 1 = ?

15 ÷ 3 = ?

60 ÷ 5 = ?

48 ÷ 8 = ?

4 ÷ 2 = ?

99 ÷ 11 = ?

55 ÷ 5 = ?

Step 2 — cross out the sentence with each answer

1.The villain soared over the canopy, then checked the map compass.

2.The villain scaled the stone cliff, then flew a pocket drone over the camp.

3.The villain snuck past the guard parrots, then scouted ahead with night vision.

4.The villain soared over the canopy, then lit up the ruin with a flash lantern.

5.The villain swung across the ravine, then lit up the ruin with a flash lantern.

6.The villain swung across the ravine, then blew a sonic whistle.

7.The villain snuck past the guard parrots, then lit up the ruin with a flash lantern.

8.The villain swung across the ravine, then flew a pocket drone over the camp.

9.The villain snuck past the guard parrots, then checked the map compass.

10.The villain scaled the stone cliff, then scouted ahead with night vision.

11.The villain soared over the canopy, then flew a pocket drone over the camp.

12.The villain vanished behind a smoke cloud, then blew a sonic whistle.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of Golden Skull Island

Culprit: Eli Drake (grappling hook · pocket drone · right handed · black slicked · loud cymbals)

Clue 1 (Rounding): "THE SNEAKY BANDIT DOES NOT USE A SONIC WHISTLE"
Round 1,526 to the nearest thousand = 2000 (T) · Round 859 to the nearest hundred = 900 (A) · Round 92 to the nearest ten = 90 (D) · Round 434 to the nearest ten = 430 (C) · Round 2,859 to the nearest hundred = 2900 (S) · Round 34 to the nearest ten = 30 (K) · Round 4,274 to the nearest hundred = 4300 (Y) · Round 1,294 to the nearest hundred = 1300 (O) · Round 232 to the nearest ten = 230 (N) · Round 17 to the nearest ten = 20 (U) · Round 3,666 to the nearest hundred = 3700 (I) · Round 3,478 to the nearest thousand = 3000 (H) · Round 112 to the nearest ten = 110 (W) · Round 8,900 to the nearest thousand = 9000 (E) · Round 48 to the nearest ten = 50 (B) · Round 1,113 to the nearest hundred = 1100 (L)
Clue 2 (Addition): "THE BANDIT USED A RIGHT HAND GRIP ON THE LOCK"
2189 + 3488 = 5677 (T) · 1837 + 1054 = 2891 (E) · 2582 + 3702 = 6284 (L) · 2544 + 1947 = 4491 (O) · 4366 + 2854 = 7220 (H) · 2196 + 3642 = 5838 (P) · 3519 + 3434 = 6953 (I) · 1049 + 1040 = 2089 (B) · 1721 + 865 = 2586 (R) · 3866 + 5186 = 9052 (N) · 2829 + 1544 = 4373 (U) · 4451 + 4228 = 8679 (A) · 4123 + 4959 = 9082 (S) · 2501 + 4227 = 6728 (D) · 4034 + 3050 = 7084 (C) · 4648 + 4360 = 9008 (K) · 2130 + 3145 = 5275 (G)
Clue 3 (Subtraction): "LOUD CYMBALS MADE THE BANDIT COVER THEIR EARS"
2729 - 1542 = 1187 (L) · 6985 - 2921 = 4064 (Y) · 13170 - 4350 = 8820 (N) · 8271 - 2541 = 5730 (A) · 5223 - 2753 = 2470 (E) · 3019 - 1524 = 1495 (D) · 5509 - 2163 = 3346 (H) · 3601 - 1512 = 2089 (C) · 7949 - 1542 = 6407 (T) · 5923 - 3699 = 2224 (B) · 9289 - 3189 = 6100 (I) · 6573 - 4792 = 1781 (M) · 7123 - 3602 = 3521 (R) · 6282 - 3957 = 2325 (U) · 7592 - 4630 = 2962 (O) · 4057 - 566 = 3491 (S) · 8670 - 1380 = 7290 (V)
Clue 4 (Multiplication facts (1-12)): "BLACK SLICKED HAIR WAS FOUND NEAR THE TENT"
11 × 2 = 22 (B) · 7 × 5 = 35 (H) · 4 × 2 = 8 (I) · 2 × 7 = 14 (D) · 5 × 9 = 45 (F) · 8 × 4 = 32 (W) · 4 × 7 = 28 (R) · 10 × 7 = 70 (S) · 5 × 5 = 25 (K) · 4 × 12 = 48 (A) · 9 × 10 = 90 (N) · 3 × 6 = 18 (T) · 3 × 12 = 36 (E) · 7 × 1 = 7 (C) · 6 × 7 = 42 (L) · 5 × 4 = 20 (O) · 11 × 8 = 88 (U)
Clue 5 (Division facts (1-12)): surviving statement (box 8) → Eli Drake
10 ÷ 1 = 10 · 12 ÷ 3 = 4 · 7 ÷ 7 = 1 · 9 ÷ 3 = 3 · 7 ÷ 1 = 7 · 15 ÷ 3 = 5 · 60 ÷ 5 = 12 · 48 ÷ 8 = 6 · 4 ÷ 2 = 2 · 99 ÷ 11 = 9 · 55 ÷ 5 = 11

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Mystery of Golden Skull Island — set in Golden Skull Island
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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