Grade 4Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision

The Mystery of the Sunken Idol

Someone swiped the Ancient Sun Crystal from the camp tent! The Chief Explorer needs your detective skills to clear the innocent scouts and catch the shadow bandit.

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	Adventure Gear	Pet Companion	Dominant Hand	Headgear Style	Camp Defense
Luke Pine	GRAPPLING HOOK	PARROT	RIGHT HANDED	EXPLORER CAP	SNAKE CHARM
Zoe Carter	POCKET COMPASS	LIZARD	LEFT HANDED	EXPLORER CAP	LOUD BELL
Sam Brooks	GRAPPLING HOOK	CAPUCHIN MONKEY	RIGHT HANDED	EXPLORER CAP	LOUD BELL
Cleo Vale	POCKET COMPASS	TREE FROG	RIGHT HANDED	EXPLORER CAP	BUG SPRAY
Cole Flint	CLIMBING PICK	CAPUCHIN MONKEY	RIGHT HANDED	EXPLORER CAP	LOUD BELL
Hugo Cliff	MAP SCROLL	CAPUCHIN MONKEY	RIGHT HANDED	BANDANA	SNAKE CHARM
Nora Hayes	MAP SCROLL	CAPUCHIN MONKEY	LEFT HANDED	PITH HELMET	LOUD BELL
Siena Coast	MAP SCROLL	CAPUCHIN MONKEY	RIGHT HANDED	EXPLORER CAP	LOUD BELL
Jack Wilder	CLIMBING PICK	CAPUCHIN MONKEY	RIGHT HANDED	PITH HELMET	LOUD BELL
Iris Glen	POCKET COMPASS	PARROT	RIGHT HANDED	EXPLORER CAP	LOUD BELL
Ivy West	MAP SCROLL	TREE FROG	RIGHT HANDED	PITH HELMET	BUG SPRAY
Finn Drake	CLIMBING PICK	PARROT	RIGHT HANDED	EXPLORER CAP	SNAKE CHARM
Maya Stone	MAP SCROLL	LIZARD	RIGHT HANDED	BANDANA	LOUD BELL
Eli Vance	POCKET COMPASS	TREE FROG	RIGHT HANDED	PITH HELMET	SNAKE CHARM
Toby Ridge	CLIMBING PICK	LIZARD	LEFT HANDED	PITH HELMET	BUG SPRAY
Milo Marsh	MAP SCROLL	FRUIT BAT	LEFT HANDED	BANDANA	LOUD BELL
Ella Frost	MAP SCROLL	CAPUCHIN MONKEY	LEFT HANDED	PITH HELMET	SNAKE CHARM
Liam Sterling	POCKET COMPASS	CAPUCHIN MONKEY	LEFT HANDED	EXPLORER CAP	BUG SPRAY
Tara Ford	CLIMBING PICK	TREE FROG	RIGHT HANDED	EXPLORER CAP	BUG SPRAY
Aria Woods	GRAPPLING HOOK	TREE FROG	LEFT HANDED	PITH HELMET	SNAKE CHARM
Leo Rivers	MAP SCROLL	FRUIT BAT	RIGHT HANDED	EXPLORER CAP	LOUD BELL

Clue 1

Addition

We tallied all the rescued campsite supplies to find our first big 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.

2873

9709

4998

5459

8124

2994

9482

5849

2873

9482

7073

4998

2753

2994

7073

2873

2695

8124

7680

5403

8124

4221

7680

3598

5849

2873

5459

8124

2873

1445 + 1428 =T

1593 + 1401 =N

2157 + 2064 =F

1106 + 1589 =C

4729 + 2951 =R

5339 + 2785 =A

3059 + 6423 =D

2153 + 2845 =E

2803 + 4270 =O

2314 + 3089 =Y

3853 + 1996 =I

5545 + 4164 =H

2497 + 1101 =U

3465 + 1994 =B

1780 + 973 =S

0/15 letters found

Clue 2

Rounding

The temple map scanner only displays distances rounded to the nearest ten.

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

230

7000

4300

1100

5000

170

230

290

1100

700

290

130

1300

230

7000

290

130

7000

370

290

170

4300

200

Round 232 to the nearest tenW

Round 685 to the nearest hundredM

Round 174 to the nearest tenA

Round 4,676 to the nearest thousandS

Round 129 to the nearest tenR

Round 20 to the nearest tenT

Round 4,342 to the nearest hundredN

Round 247 to the nearest hundredD

Round 371 to the nearest tenG

Round 6,657 to the nearest thousandI

Round 1,310 to the nearest hundredO

Round 1,080 to the nearest hundredE

Round 286 to the nearest tenH

0/13 letters found

Clue 3

Subtraction

We compared the original trail food weight to what was 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.

5534

3928

1603

4686

1987

6370

6536

2619

3439

5534

2923

1449

3814

4686

1449

2619

1603

8050

7782

7271

1449

6370

4578

1987

8050

7782

1603

6370

6608 - 1074 =T

6564 - 3641 =W

9661 - 1879 =B

10135 - 3765 =L

7198 - 3759 =I

7543 - 272 =Y

7469 - 3655 =S

3006 - 1557 =A

4572 - 2585 =U

8692 - 4006 =C

3172 - 1569 =E

5417 - 1489 =H

11065 - 3015 =D

5877 - 1299 =O

3431 - 812 =R

8340 - 1804 =P

0/16 letters found

Clue 4

Multiplication facts (1-12)

The scouts arranged their rescue gear in equal rows along the tent wall.

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

7 × 1 =A

3 × 1 =B

2 × 8 =P

3 × 6 =O

1 × 5 =F

12 × 8 =R

11 × 4 =N

9 × 6 =X

4 × 1 =S

10 × 4 =M

10 × 6 =C

1 × 8 =D

9 × 9 =E

11 × 5 =G

11 × 9 =W

11 × 2 =L

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

We divided the ancient coin collection equally among the search 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

8 ÷ 2 = ?

81 ÷ 9 = ?

84 ÷ 12 = ?

33 ÷ 3 = ?

14 ÷ 7 = ?

120 ÷ 10 = ?

21 ÷ 7 = ?

80 ÷ 10 = ?

9 ÷ 9 = ?

80 ÷ 8 = ?

24 ÷ 4 = ?

Step 2 — cross out the sentence with each answer

1.The villain consulted the ancient map, then released a green lizard.

2.The villain lit up the dark cavern, then fed a cheeky monkey.

3.The villain swung across the ravine, then whistled for a parrot.

4.The villain scaled the mossy cliff, then fed a cheeky monkey.

5.The villain consulted the ancient map, then whistled for a parrot.

6.The villain swung across the ravine, then checked a glowing frog.

7.The villain swung across the ravine, then fed a cheeky monkey.

8.The villain scouted the ruin walls, then checked a glowing frog.

9.The villain scouted the ruin walls, then fed a cheeky monkey.

10.The villain scaled the mossy cliff, then frightened a roosting bat.

11.The villain consulted the ancient map, then fed a cheeky monkey.

12.The villain scouted the ruin walls, then frightened a roosting bat.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of the Sunken Idol

Culprit: Iris Glen (POCKET COMPASS · PARROT · RIGHT HANDED · EXPLORER CAP · LOUD BELL)

Clue 1 (Addition): "THE BANDIT DOES NOT CARRY A FRUIT BAT"
1445 + 1428 = 2873 (T) · 1593 + 1401 = 2994 (N) · 2157 + 2064 = 4221 (F) · 1106 + 1589 = 2695 (C) · 4729 + 2951 = 7680 (R) · 5339 + 2785 = 8124 (A) · 3059 + 6423 = 9482 (D) · 2153 + 2845 = 4998 (E) · 2803 + 4270 = 7073 (O) · 2314 + 3089 = 5403 (Y) · 3853 + 1996 = 5849 (I) · 5545 + 4164 = 9709 (H) · 2497 + 1101 = 3598 (U) · 3465 + 1994 = 5459 (B) · 1780 + 973 = 2753 (S)
Clue 2 (Rounding): "WITNESS SAW THEM THROW WITH RIGHT HAND"
Round 232 to the nearest ten = 230 (W) · Round 685 to the nearest hundred = 700 (M) · Round 174 to the nearest ten = 170 (A) · Round 4,676 to the nearest thousand = 5000 (S) · Round 129 to the nearest ten = 130 (R) · Round 20 to the nearest ten = 20 (T) · Round 4,342 to the nearest hundred = 4300 (N) · Round 247 to the nearest hundred = 200 (D) · Round 371 to the nearest ten = 370 (G) · Round 6,657 to the nearest thousand = 7000 (I) · Round 1,310 to the nearest hundred = 1300 (O) · Round 1,080 to the nearest hundred = 1100 (E) · Round 286 to the nearest ten = 290 (H)
Clue 3 (Subtraction): "THE CULPRIT WAS SCARED BY A LOUD BELL"
6608 - 1074 = 5534 (T) · 6564 - 3641 = 2923 (W) · 9661 - 1879 = 7782 (B) · 10135 - 3765 = 6370 (L) · 7198 - 3759 = 3439 (I) · 7543 - 272 = 7271 (Y) · 7469 - 3655 = 3814 (S) · 3006 - 1557 = 1449 (A) · 4572 - 2585 = 1987 (U) · 8692 - 4006 = 4686 (C) · 3172 - 1569 = 1603 (E) · 5417 - 1489 = 3928 (H) · 11065 - 3015 = 8050 (D) · 5877 - 1299 = 4578 (O) · 3431 - 812 = 2619 (R) · 8340 - 1804 = 6536 (P)
Clue 4 (Multiplication facts (1-12)): "A BADGE FROM AN EXPLORER CAP WAS DROPPED"
7 × 1 = 7 (A) · 3 × 1 = 3 (B) · 2 × 8 = 16 (P) · 3 × 6 = 18 (O) · 1 × 5 = 5 (F) · 12 × 8 = 96 (R) · 11 × 4 = 44 (N) · 9 × 6 = 54 (X) · 4 × 1 = 4 (S) · 10 × 4 = 40 (M) · 10 × 6 = 60 (C) · 1 × 8 = 8 (D) · 9 × 9 = 81 (E) · 11 × 5 = 55 (G) · 11 × 9 = 99 (W) · 11 × 2 = 22 (L)
Clue 5 (Division facts (1-12)): surviving statement (box 5) → Iris Glen
8 ÷ 2 = 4 · 81 ÷ 9 = 9 · 84 ÷ 12 = 7 · 33 ÷ 3 = 11 · 14 ÷ 7 = 2 · 120 ÷ 10 = 12 · 21 ÷ 7 = 3 · 80 ÷ 10 = 8 · 9 ÷ 9 = 1 · 80 ÷ 8 = 10 · 24 ÷ 4 = 6

About this mystery

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

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