Grade 4Reading: grades 3-4MultiplicationRoundingSkip countingSubtractionDivision

The Mystery of the Sunken Idol

Someone snuck into the Map Island ruins and snatched the sacred Golden Idol! Head Excavator Dr. Santos needs your detective team to solve the clue math, analyze the jungle evidence, and identify the culprit before they escape the 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	Explorer Skill	Special Gear	Eyewear	Hair Style	Jungle Fear
Liam Connor	lock picking	boomerang throw	wears brass goggles	spiky red hair	scared of spiders
Nora Chen	rope swinging	compass spin	wears brass goggles	curly black hair	afraid of bats
Diego Cruz	vine climbing	grapple hook launch	wears brass goggles	curly black hair	allergic to orchids
Maya Santos	lock picking	spyglass glare	wears leather visor	spiky red hair	afraid of bats
Zoe Bell	torch lighting	smoke bomb drop	wears brass goggles	curly black hair	scared of spiders
Mason Reed	lock picking	boomerang throw	wears brass goggles	spiky red hair	allergic to orchids
Sam Rivera	map making	boomerang throw	wears leather visor	slick blonde hair	scared of spiders
Lucas Drake	rope swinging	grapple hook launch	wears leather visor	curly black hair	afraid of bats
Siena Fox	lock picking	grapple hook launch	wears brass goggles	curly black hair	scared of spiders
Ava Martinez	map making	grapple hook launch	wears leather visor	curly black hair	scared of spiders
Ruby Stone	vine climbing	smoke bomb drop	wears brass goggles	slick blonde hair	allergic to orchids
Elena Frost	rope swinging	grapple hook launch	wears brass goggles	slick blonde hair	afraid of bats
Leo Sterling	rope swinging	boomerang throw	wears brass goggles	curly black hair	scared of spiders
Grace Kim	rope swinging	spyglass glare	wears leather visor	curly black hair	scared of spiders
Ethan Hunt	map making	boomerang throw	wears brass goggles	slick blonde hair	scared of spiders
Ella Thorne	torch lighting	grapple hook launch	wears brass goggles	slick blonde hair	allergic to orchids
Chloe Brooks	lock picking	spyglass glare	wears brass goggles	curly black hair	scared of spiders
Priya Patel	vine climbing	compass spin	wears brass goggles	curly black hair	scared of spiders
Cole Hunter	lock picking	compass spin	wears brass goggles	spiky red hair	allergic to orchids
Jax Miller	lock picking	boomerang throw	wears brass goggles	spiky red hair	afraid of bats
Indy Vance	lock picking	spyglass glare	wears leather visor	curly black hair	afraid of bats

Clue 1

Multiplication facts (1-12)

We found rows of supply crates stacked neatly outside the temple. Calculate the total supplies to open the crate containing 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.

100

120

5 × 4 =T

11 × 8 =C

3 × 11 =O

12 × 10 =D

9 × 5 =S

12 × 4 =H

10 × 10 =V

8 × 7 =E

4 × 1 =N

2 × 9 =L

7 × 4 =I

12 × 7 =A

12 × 6 =K

10 × 8 =M

9 × 9 =P

4 × 11 =Y

0/16 letters found

Clue 2

Rounding

The ancient golden radar screen shows an estimated distance rounded to the nearest hundred. Solve this to lock in our search grid.

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

9000

430

2000

500

2000

130

430

200

900

430

7000

2000

170

7000

2000

700

3000

700

1700

430

2000

230

3700

900

9000

430

1700

230

700

9000

900

Round 946 to the nearest hundredT

Round 1,652 to the nearest hundredL

Round 233 to the nearest tenI

Round 724 to the nearest hundredG

Round 1,841 to the nearest thousandS

Round 30 to the nearest tenA

Round 7,132 to the nearest thousandR

Round 233 to the nearest hundredC

Round 173 to the nearest tenB

Round 430 to the nearest tenE

Round 3,695 to the nearest hundredN

Round 2,582 to the nearest thousandO

Round 19 to the nearest tenW

Round 129 to the nearest tenP

Round 525 to the nearest hundredU

Round 8,972 to the nearest thousandH

0/16 letters found

Clue 3

Skip counting

Tracks lead down the stone path in equal steps. Skip count along the trail to discover which ancient archway the culprit took.

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

130

110

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35T

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48R

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100A

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30P

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14S

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45V

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26I

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20D

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130E

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150L

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80H

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16C

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21N

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70Y

0/14 letters found

Clue 4

Subtraction

We compared the original camp gear count to what remains after the raid. Subtract to find out how many flashlight batteries were 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.

4509

8012

7564

8705

1739

8705

4993

5238

8012

7505

6863

7564

2534

5238

3942

7564

7636

3475

2550

2470

6863

4989

2470

4989

4430

4226

8012

4989

3417

3475

5238

6975 - 2466 =B

7469 - 3994 =O

7609 - 2620 =E

4811 - 2261 =N

9107 - 1602 =Y

3672 - 255 =D

6305 - 2079 =P

6338 - 1908 =M

9267 - 562 =C

2896 - 426 =T

5057 - 3318 =K

7596 - 32 =A

12700 - 4688 =L

4022 - 1488 =I

6601 - 2659 =W

8000 - 364 =S

10136 - 3273 =H

5836 - 598 =R

7848 - 2855 =U

0/19 letters found

Clue 5

Division facts (1-12) — the last clue

To trek deeper into the jungle, our rescue party must split all water canteens equally among the teams. Divide to pack the bags.

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

2 ÷ 1 = ?

40 ÷ 5 = ?

70 ÷ 7 = ?

11 ÷ 1 = ?

12 ÷ 12 = ?

54 ÷ 9 = ?

15 ÷ 3 = ?

21 ÷ 3 = ?

24 ÷ 6 = ?

3 ÷ 1 = ?

48 ÷ 4 = ?

Step 2 — cross out the sentence with each answer

1.The villain climbed the temple wall, then spun a golden compass.

2.The villain swung on a jungle vine, then threw a wooden boomerang.

3.The villain climbed the temple wall, then stared through a spyglass.

4.The villain picked the ancient lock, then spun a golden compass.

5.The villain picked the ancient lock, then dropped a thick smoke bomb.

6.The villain swung on a jungle vine, then launched a grapple hook.

7.The villain swung on a jungle vine, then spun a golden compass.

8.The villain picked the ancient lock, then stared through a spyglass.

9.The villain lit a bright torch, then dropped a thick smoke bomb.

10.The villain picked the ancient lock, then launched a grapple hook.

11.The villain swung on a jungle vine, then stared through a spyglass.

12.The villain swung on a jungle vine, then dropped a thick smoke bomb.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of the Sunken Idol

Culprit: Zoe Bell (torch lighting · smoke bomb drop · wears brass goggles · curly black hair · scared of spiders)

Clue 1 (Multiplication facts (1-12)): "THE SNEAKY VILLAIN DOES NOT SPIN COMPASSES"
5 × 4 = 20 (T) · 11 × 8 = 88 (C) · 3 × 11 = 33 (O) · 12 × 10 = 120 (D) · 9 × 5 = 45 (S) · 12 × 4 = 48 (H) · 10 × 10 = 100 (V) · 8 × 7 = 56 (E) · 4 × 1 = 4 (N) · 2 × 9 = 18 (L) · 7 × 4 = 28 (I) · 12 × 7 = 84 (A) · 12 × 6 = 72 (K) · 10 × 8 = 80 (M) · 9 × 9 = 81 (P) · 4 × 11 = 44 (Y)
Clue 2 (Rounding): "THE SUSPECT WEARS BRASS GOGGLES IN THE LIGHT"
Round 946 to the nearest hundred = 900 (T) · Round 1,652 to the nearest hundred = 1700 (L) · Round 233 to the nearest ten = 230 (I) · Round 724 to the nearest hundred = 700 (G) · Round 1,841 to the nearest thousand = 2000 (S) · Round 30 to the nearest ten = 30 (A) · Round 7,132 to the nearest thousand = 7000 (R) · Round 233 to the nearest hundred = 200 (C) · Round 173 to the nearest ten = 170 (B) · Round 430 to the nearest ten = 430 (E) · Round 3,695 to the nearest hundred = 3700 (N) · Round 2,582 to the nearest thousand = 3000 (O) · Round 19 to the nearest ten = 20 (W) · Round 129 to the nearest ten = 130 (P) · Round 525 to the nearest hundred = 500 (U) · Round 8,972 to the nearest thousand = 9000 (H)
Clue 3 (Skip counting): "THE VILLAIN SHIVERED AT CREEPY SPIDERS"
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (P) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (S) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (V) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (L) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (C) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (Y)
Clue 4 (Subtraction): "BLACK CURLY HAIR WAS ON THE TEMPLE DOOR"
6975 - 2466 = 4509 (B) · 7469 - 3994 = 3475 (O) · 7609 - 2620 = 4989 (E) · 4811 - 2261 = 2550 (N) · 9107 - 1602 = 7505 (Y) · 3672 - 255 = 3417 (D) · 6305 - 2079 = 4226 (P) · 6338 - 1908 = 4430 (M) · 9267 - 562 = 8705 (C) · 2896 - 426 = 2470 (T) · 5057 - 3318 = 1739 (K) · 7596 - 32 = 7564 (A) · 12700 - 4688 = 8012 (L) · 4022 - 1488 = 2534 (I) · 6601 - 2659 = 3942 (W) · 8000 - 364 = 7636 (S) · 10136 - 3273 = 6863 (H) · 5836 - 598 = 5238 (R) · 7848 - 2855 = 4993 (U)
Clue 5 (Division facts (1-12)): surviving statement (box 9) → Zoe Bell
2 ÷ 1 = 2 · 40 ÷ 5 = 8 · 70 ÷ 7 = 10 · 11 ÷ 1 = 11 · 12 ÷ 12 = 1 · 54 ÷ 9 = 6 · 15 ÷ 3 = 5 · 21 ÷ 3 = 7 · 24 ÷ 6 = 4 · 3 ÷ 1 = 3 · 48 ÷ 4 = 12

About this mystery

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

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