Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Mystery of Sunstone Isle

Someone snuck into the camp and snatched the Golden Sun Medallion before the big dig! Solve the clues to expose the culprit.

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	Special Gear	Jungle Tool	Stance	Hat Color	Fear
Explorer Maya	SIGNAL FLARE	BINOCULARS	RIGHT HANDED	GREEN CAP	BATS
Guide Owen	SIGNAL FLARE	CANTEEN	LEFT HANDED	GREEN CAP	SPIDERS
Dr Elena	GRAPPLING HOOK	MAGNIFYING GLASS	RIGHT HANDED	GREEN CAP	BATS
Guide Sarah	BRIGHT TORCH	WALKIE TALKIE	RIGHT HANDED	RED CAP	SNAKES
Scout Mia	ROPE LADDER	BINOCULARS	LEFT HANDED	BLUE CAP	BATS
Professor Ben	GRAPPLING HOOK	CANTEEN	LEFT HANDED	BLUE CAP	SNAKES
Tracker Zoe	GRAPPLING HOOK	MAGNIFYING GLASS	LEFT HANDED	GREEN CAP	BATS
Ranger Eli	ROPE LADDER	MAGNIFYING GLASS	RIGHT HANDED	GREEN CAP	BATS
Captain Sam	BRIGHT TORCH	BINOCULARS	LEFT HANDED	GREEN CAP	SNAKES
Captain Ivy	ROPE LADDER	MAGNIFYING GLASS	RIGHT HANDED	BLUE CAP	SPIDERS
Dr Nina	ROPE LADDER	MAGNIFYING GLASS	LEFT HANDED	BLUE CAP	BATS
Explorer Luke	SIGNAL FLARE	MACHETE	LEFT HANDED	RED CAP	SNAKES
Professor Max	GRAPPLING HOOK	WALKIE TALKIE	RIGHT HANDED	GREEN CAP	SPIDERS
Ranger Noah	MAP COMPASS	WALKIE TALKIE	LEFT HANDED	GREEN CAP	BATS
Ranger Chloe	BRIGHT TORCH	CANTEEN	RIGHT HANDED	GREEN CAP	BATS
Captain Ruby	GRAPPLING HOOK	MACHETE	LEFT HANDED	GREEN CAP	SNAKES
Guide Carlos	SIGNAL FLARE	MACHETE	RIGHT HANDED	RED CAP	BATS
Scout Ava	SIGNAL FLARE	WALKIE TALKIE	RIGHT HANDED	RED CAP	BATS
Scout Lily	ROPE LADDER	CANTEEN	LEFT HANDED	GREEN CAP	SNAKES
Ranger Jack	MAP COMPASS	CANTEEN	RIGHT HANDED	GREEN CAP	BATS
Tracker Cole	SIGNAL FLARE	MACHETE	RIGHT HANDED	RED CAP	SPIDERS

Clue 1

Rounding

The team scanner only shows rounded camp counts. Round each distance to find the first clue.

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

900

7000

1100

2000

5000

3000

900

4300

1100

2900

430

5000

3000

4300

1300

1700

1100

9000

Round 914 to the nearest hundredT

Round 426 to the nearest tenB

Round 1,287 to the nearest hundredU

Round 4,266 to the nearest hundredC

Round 1,659 to the nearest hundredL

Round 72 to the nearest tenR

Round 2,945 to the nearest thousandO

Round 31 to the nearest tenE

Round 54 to the nearest tenI

Round 2,467 to the nearest thousandD

Round 2,912 to the nearest hundredY

Round 9,343 to the nearest thousandS

Round 4,968 to the nearest thousandN

Round 7,130 to the nearest thousandH

Round 1,075 to the nearest hundredA

0/15 letters found

Clue 2

Addition

To unpack the supply crate, you add up the total gear logged today.

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

3233

2387

9325

7476

5684

9325

7090

8041

6204

4960

9190

7740

9325

6204

4563

9325

7090

4960

4046

2288

3233

2387

4960

2288

4563

2387

3233

2387

7090

5684

6204

1366 + 1867 =T

2501 + 3183 =N

743 + 1545 =I

3176 + 6014 =O

1800 + 2246 =W

4377 + 3099 =S

3200 + 4540 =P

3944 + 3146 =A

4319 + 3722 =K

1706 + 2857 =G

3827 + 2377 =D

6301 + 3024 =E

976 + 1411 =H

3001 + 1959 =R

0/14 letters found

Clue 3

Subtraction

Subtract the used rations from the total to see 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.

6917

8771

7532

8683

7444

5661

2607

7532

8683

5135

6516

8683

7532

7444

7841

7532

2607

7444

6917

5135

2744

3175

7532

7444

6440

5661

3210

7938

1949

7444

6917

5135

7290 - 373 =T

7842 - 2707 =S

12509 - 3738 =H

3222 - 478 =Q

5417 - 3468 =B

8089 - 4914 =U

12233 - 4295 =G

5927 - 3320 =D

10901 - 4461 =K

7746 - 214 =E

7529 - 1013 =C

9912 - 4251 =I

7010 - 3800 =N

10455 - 1772 =R

10346 - 2505 =M

12358 - 4914 =A

0/16 letters found

Clue 4

Multiplication facts (1-12)

The jungle path has equal rows of stone tiles. Multiply to count them.

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

120

9 × 3 =A

3 × 7 =H

10 × 7 =C

8 × 10 =L

10 × 12 =M

10 × 11 =R

3 × 8 =N

9 × 5 =E

2 × 11 =G

8 × 2 =T

7 × 9 =P

9 × 9 =F

0/12 letters found

Clue 5

Division facts (1-12) — the last clue

Split the remaining camp supplies equally among the rescue 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

44 ÷ 4 = ?

72 ÷ 6 = ?

16 ÷ 2 = ?

20 ÷ 5 = ?

60 ÷ 6 = ?

60 ÷ 12 = ?

12 ÷ 12 = ?

9 ÷ 3 = ?

6 ÷ 3 = ?

48 ÷ 8 = ?

63 ÷ 9 = ?

Step 2 — cross out the sentence with each answer

1.The villain fired a bright flare, then called the secret base.

2.The villain hooked the stone statue, then called the secret base.

3.The villain lit up the dark cave, then examined the ancient runes.

4.The villain fired a bright flare, then spied on the campsite.

5.The villain lit up the dark cave, then called the secret base.

6.The villain lit up the dark cave, then spied on the campsite.

7.The villain climbed the cliff wall, then spied on the campsite.

8.The villain hooked the stone statue, then examined the ancient runes.

9.The villain checked the old map, then drank cold water.

10.The villain hooked the stone statue, then spied on the campsite.

11.The villain climbed the cliff wall, then examined the ancient runes.

12.The villain lit up the dark cave, then drank cold water.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of Sunstone Isle

Culprit: Ranger Jack (MAP COMPASS · CANTEEN · RIGHT HANDED · GREEN CAP · BATS)

Clue 1 (Rounding): "THE RAIDER DID NOT CARRY BINOCULARS"
Round 914 to the nearest hundred = 900 (T) · Round 426 to the nearest ten = 430 (B) · Round 1,287 to the nearest hundred = 1300 (U) · Round 4,266 to the nearest hundred = 4300 (C) · Round 1,659 to the nearest hundred = 1700 (L) · Round 72 to the nearest ten = 70 (R) · Round 2,945 to the nearest thousand = 3000 (O) · Round 31 to the nearest ten = 30 (E) · Round 54 to the nearest ten = 50 (I) · Round 2,467 to the nearest thousand = 2000 (D) · Round 2,912 to the nearest hundred = 2900 (Y) · Round 9,343 to the nearest thousand = 9000 (S) · Round 4,968 to the nearest thousand = 5000 (N) · Round 7,130 to the nearest thousand = 7000 (H) · Round 1,075 to the nearest hundred = 1100 (A)
Clue 2 (Addition): "THE SNEAK DROPPED GEAR WITH RIGHT HAND"
1366 + 1867 = 3233 (T) · 2501 + 3183 = 5684 (N) · 743 + 1545 = 2288 (I) · 3176 + 6014 = 9190 (O) · 1800 + 2246 = 4046 (W) · 4377 + 3099 = 7476 (S) · 3200 + 4540 = 7740 (P) · 3944 + 3146 = 7090 (A) · 4319 + 3722 = 8041 (K) · 1706 + 2857 = 4563 (G) · 3827 + 2377 = 6204 (D) · 6301 + 3024 = 9325 (E) · 976 + 1411 = 2387 (H) · 3001 + 1959 = 4960 (R)
Clue 3 (Subtraction): "THE RAIDER SCREAMED AT SQUEAKING BATS"
7290 - 373 = 6917 (T) · 7842 - 2707 = 5135 (S) · 12509 - 3738 = 8771 (H) · 3222 - 478 = 2744 (Q) · 5417 - 3468 = 1949 (B) · 8089 - 4914 = 3175 (U) · 12233 - 4295 = 7938 (G) · 5927 - 3320 = 2607 (D) · 10901 - 4461 = 6440 (K) · 7746 - 214 = 7532 (E) · 7529 - 1013 = 6516 (C) · 9912 - 4251 = 5661 (I) · 7010 - 3800 = 3210 (N) · 10455 - 1772 = 8683 (R) · 10346 - 2505 = 7841 (M) · 12358 - 4914 = 7444 (A)
Clue 4 (Multiplication facts (1-12)): "A GREEN CAP FELL NEAR THE TEMPLE GATE"
9 × 3 = 27 (A) · 3 × 7 = 21 (H) · 10 × 7 = 70 (C) · 8 × 10 = 80 (L) · 10 × 12 = 120 (M) · 10 × 11 = 110 (R) · 3 × 8 = 24 (N) · 9 × 5 = 45 (E) · 2 × 11 = 22 (G) · 8 × 2 = 16 (T) · 7 × 9 = 63 (P) · 9 × 9 = 81 (F)
Clue 5 (Division facts (1-12)): surviving statement (box 9) → Ranger Jack
44 ÷ 4 = 11 · 72 ÷ 6 = 12 · 16 ÷ 2 = 8 · 20 ÷ 5 = 4 · 60 ÷ 6 = 10 · 60 ÷ 12 = 5 · 12 ÷ 12 = 1 · 9 ÷ 3 = 3 · 6 ÷ 3 = 2 · 48 ÷ 8 = 6 · 63 ÷ 9 = 7

About this mystery

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

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