Grade 4Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision

The Serpent Island Temple Mystery

A sneaky temple raider snuck into the camp and took off with a rare artifact! The chief archaeologist needs your help to examine the clues, decode the evidence, and spot the culprit before they escape Serpent Island.

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	Jungle Gear	Stolen Artifact	Nervous Habit	Headgear	Phobia
Lara Croft	Rope Ladder	Golden Idol	Taps Boots	Pith Helmet	Fireflies
Victor Sullivan	Grappling Hook	Golden Idol	Taps Boots	Pith Helmet	Fireflies
Marcus Brody	Glider Wings	Crystal Skull	Taps Boots	Canvas Cap	Fireflies
Nate Drake	Machete	Crystal Skull	Taps Boots	Canvas Cap	Snake Hisses
Indiana Drake	Compass Watch	Jade Tablet	Taps Boots	Canvas Cap	Fireflies
Short Round	Grappling Hook	Crystal Skull	Taps Boots	Canvas Cap	Bat Swarms
Zack Brody	Machete	Jade Tablet	Taps Boots	Canvas Cap	Snake Hisses
Elena Fisher	Rope Ladder	Ruby Map	Adjusts Strap	Leather Fedora	Fireflies
Jack Hunter	Machete	Bronze Medallion	Taps Boots	Canvas Cap	Snake Hisses
Marion Raven	Machete	Bronze Medallion	Taps Boots	Pith Helmet	Fireflies
Sonia Reyes	Machete	Golden Idol	Taps Boots	Canvas Cap	Fireflies
Chloe Frazer	Rope Ladder	Ruby Map	Adjusts Strap	Canvas Cap	Snake Hisses
Mouse Finbar	Rope Ladder	Ruby Map	Taps Boots	Canvas Cap	Snake Hisses
Elsa Schneider	Grappling Hook	Jade Tablet	Taps Boots	Pith Helmet	Snake Hisses
Professor Oberon	Compass Watch	Crystal Skull	Adjusts Strap	Canvas Cap	Fireflies
Dr Smolder	Machete	Ruby Map	Adjusts Strap	Leather Fedora	Bat Swarms
Shelly Oberon	Rope Ladder	Golden Idol	Adjusts Strap	Canvas Cap	Fireflies
Maya Lin	Rope Ladder	Jade Tablet	Taps Boots	Canvas Cap	Bat Swarms
Leo Cruz	Glider Wings	Bronze Medallion	Taps Boots	Canvas Cap	Fireflies
Rene Belloq	Grappling Hook	Ruby Map	Adjusts Strap	Leather Fedora	Snake Hisses
Ruby Roundhouse	Machete	Jade Tablet	Taps Boots	Canvas Cap	Fireflies

Clue 1

Addition

The team tallies up all the footprints found near the camp gate.

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

5976

5651

6617

6801

6859

5948

8390

6617

6801

8390

6980

6617

7349

2595

6980

5976

5651

6859

4936

6617

5976

5651

6617

3270

6801

5759

7349

5976

6859

6238

7349

6779

8638

6238

1979 + 3997 =T

4573 + 2286 =A

5115 + 3275 =D

3205 + 2446 =H

2606 + 4374 =O

5153 + 3485 =U

3300 + 4049 =S

4386 + 2393 =K

2942 + 3675 =E

3408 + 2830 =L

2115 + 3644 =Y

4136 + 2665 =R

1535 + 3401 =V

2186 + 1084 =C

4154 + 1794 =I

1260 + 1335 =N

0/16 letters found

Clue 2

Rounding

An ancient stone door lock shows rounded pressure numbers on the dial.

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

7000

110

300

370

110

300

370

3000

300

110

370

300

3000

110

1700

2000

7000

2300

9000

3000

3700

Round 106 to the nearest tenA

Round 370 to the nearest tenD

Round 257 to the nearest hundredR

Round 23 to the nearest tenE

Round 9,038 to the nearest thousandO

Round 3,747 to the nearest hundredS

Round 69 to the nearest tenI

Round 2,225 to the nearest thousandN

Round 3,221 to the nearest thousandT

Round 2,301 to the nearest hundredB

Round 29 to the nearest tenU

Round 1,724 to the nearest hundredP

Round 89 to the nearest tenH

Round 6,957 to the nearest thousandG

0/14 letters found

Clue 3

Subtraction

The camp crew checks the gear tent to figure 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.

5760

7714

5457

1827

2668

4288

3447

5457

7714

3633

3447

1614

5457

3633

8393

1206

8232

7714

3633

2898

4288

2668

3633

7714

8232

5457

2898

3633

7714

7442

3447

7103 - 1343 =B

4983 - 2315 =H

8415 - 2958 =I

3232 - 334 =D

5968 - 2335 =E

4718 - 1271 =F

4051 - 2224 =G

4443 - 2829 =L

10802 - 2409 =S

13151 - 4919 =A

9087 - 4799 =T

1304 - 98 =C

8378 - 664 =R

10811 - 3369 =O

0/14 letters found

Clue 4

Multiplication facts (1-12)

The explorers count crates arranged in equal rows inside the vault.

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 × 9 =S

12 × 4 =T

2 × 1 =E

2 × 12 =H

2 × 2 =R

7 × 7 =P

1 × 1 =D

9 × 1 =B

10 × 5 =A

12 × 8 =O

10 × 2 =N

7 × 10 =C

2 × 11 =G

9 × 8 =V

0/14 letters found

Clue 5

Division facts (1-12) — the last clue

The expedition leader splits the trail markers equally among the 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

10 ÷ 2 = ?

80 ÷ 8 = ?

48 ÷ 8 = ?

42 ÷ 6 = ?

27 ÷ 9 = ?

7 ÷ 7 = ?

4 ÷ 1 = ?

66 ÷ 6 = ?

24 ÷ 3 = ?

90 ÷ 10 = ?

132 ÷ 11 = ?

Step 2 — cross out the sentence with each answer

1.The villain soared over the river with glider wings, then pocketed the jade tablet.

2.The villain navigated the dark maze with a compass watch, then pocketed the jade tablet.

3.The villain scaled the stone wall with a grappling hook, then pocketed the jade tablet.

4.The villain climbed down the cliff with a rope ladder, then stole the golden idol.

5.The villain cleared heavy vines with a machete, then stole the golden idol.

6.The villain soared over the river with glider wings, then grabbed the bronze medallion.

7.The villain scaled the stone wall with a grappling hook, then stole the golden idol.

8.The villain navigated the dark maze with a compass watch, then swiped the crystal skull.

9.The villain climbed down the cliff with a rope ladder, then swiped the crystal skull.

10.The villain cleared heavy vines with a machete, then pocketed the jade tablet.

11.The villain soared over the river with glider wings, then swiped the crystal skull.

12.The villain cleared heavy vines with a machete, then snagged the ruby map.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Serpent Island Temple Mystery

Culprit: Indiana Drake (Compass Watch · Jade Tablet · Taps Boots · Canvas Cap · Fireflies)

Clue 1 (Addition): "THE RAIDER DOES NOT HAVE THE CRYSTAL SKULL"
1979 + 3997 = 5976 (T) · 4573 + 2286 = 6859 (A) · 5115 + 3275 = 8390 (D) · 3205 + 2446 = 5651 (H) · 2606 + 4374 = 6980 (O) · 5153 + 3485 = 8638 (U) · 3300 + 4049 = 7349 (S) · 4386 + 2393 = 6779 (K) · 2942 + 3675 = 6617 (E) · 3408 + 2830 = 6238 (L) · 2115 + 3644 = 5759 (Y) · 4136 + 2665 = 6801 (R) · 1535 + 3401 = 4936 (V) · 2186 + 1084 = 3270 (C) · 4154 + 1794 = 5948 (I) · 1260 + 1335 = 2595 (N)
Clue 2 (Rounding): "A GUARD HEARD THE RAIDER TAPPING BOOTS"
Round 106 to the nearest ten = 110 (A) · Round 370 to the nearest ten = 370 (D) · Round 257 to the nearest hundred = 300 (R) · Round 23 to the nearest ten = 20 (E) · Round 9,038 to the nearest thousand = 9000 (O) · Round 3,747 to the nearest hundred = 3700 (S) · Round 69 to the nearest ten = 70 (I) · Round 2,225 to the nearest thousand = 2000 (N) · Round 3,221 to the nearest thousand = 3000 (T) · Round 2,301 to the nearest hundred = 2300 (B) · Round 29 to the nearest ten = 30 (U) · Round 1,724 to the nearest hundred = 1700 (P) · Round 89 to the nearest ten = 90 (H) · Round 6,957 to the nearest thousand = 7000 (G)
Clue 3 (Subtraction): "BRIGHT FIREFLIES SCARED THE RAIDER OFF"
7103 - 1343 = 5760 (B) · 4983 - 2315 = 2668 (H) · 8415 - 2958 = 5457 (I) · 3232 - 334 = 2898 (D) · 5968 - 2335 = 3633 (E) · 4718 - 1271 = 3447 (F) · 4051 - 2224 = 1827 (G) · 4443 - 2829 = 1614 (L) · 10802 - 2409 = 8393 (S) · 13151 - 4919 = 8232 (A) · 9087 - 4799 = 4288 (T) · 1304 - 98 = 1206 (C) · 8378 - 664 = 7714 (R) · 10811 - 3369 = 7442 (O)
Clue 4 (Multiplication facts (1-12)): "SNAGGED CANVAS CAP THREADS ON A BRANCH"
11 × 9 = 99 (S) · 12 × 4 = 48 (T) · 2 × 1 = 2 (E) · 2 × 12 = 24 (H) · 2 × 2 = 4 (R) · 7 × 7 = 49 (P) · 1 × 1 = 1 (D) · 9 × 1 = 9 (B) · 10 × 5 = 50 (A) · 12 × 8 = 96 (O) · 10 × 2 = 20 (N) · 7 × 10 = 70 (C) · 2 × 11 = 22 (G) · 9 × 8 = 72 (V)
Clue 5 (Division facts (1-12)): surviving statement (box 2) → Indiana Drake
10 ÷ 2 = 5 · 80 ÷ 8 = 10 · 48 ÷ 8 = 6 · 42 ÷ 6 = 7 · 27 ÷ 9 = 3 · 7 ÷ 7 = 1 · 4 ÷ 1 = 4 · 66 ÷ 6 = 11 · 24 ÷ 3 = 8 · 90 ÷ 10 = 9 · 132 ÷ 11 = 12

About this mystery

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

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