Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Sunken Temple Compass

A secret golden compass was snatched from the camp tent right before sunset! Detective, examine the tracks left behind, decode the notes, and catch the sneaky rival explorer.

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	Primary Tool	Companion Animal	Stance	Hat Color	Fear
Ivy Finch	Smoke Bomb	Tree Frog	LEFT HANDED	GREEN HAT	SQUEAKY TOYS
Toby Ridge	Grappling Hook	Tree Frog	LEFT HANDED	GREEN HAT	LOUD WHISTLES
Milo Marsh	Grappling Hook	Tree Frog	RIGHT HANDED	RED HAT	SQUEAKY TOYS
Wyatt Woods	Grappling Hook	Iguana	LEFT HANDED	GREEN HAT	LOUD WHISTLES
Maya Rivers	Glider Wings	Capuchin	RIGHT HANDED	BROWN HAT	LOUD WHISTLES
Kira Peak	Flash Cannon	Iguana	RIGHT HANDED	GREEN HAT	BRIGHT FLASHES
Felix Flint	Flash Cannon	Tree Frog	LEFT HANDED	BROWN HAT	SQUEAKY TOYS
Gavin Grove	Vine Lasso	Iguana	RIGHT HANDED	BROWN HAT	SQUEAKY TOYS
Captain Cora	Smoke Bomb	Capuchin	RIGHT HANDED	GREEN HAT	LOUD WHISTLES
Clara Fern	Glider Wings	Parrot	LEFT HANDED	GREEN HAT	LOUD WHISTLES
Zoe Carter	Grappling Hook	Parrot	LEFT HANDED	GREEN HAT	LOUD WHISTLES
Paige Lake	Flash Cannon	Iguana	LEFT HANDED	BROWN HAT	BRIGHT FLASHES
Tessa Vale	Glider Wings	Iguana	RIGHT HANDED	GREEN HAT	SQUEAKY TOYS
Sammy Swift	Grappling Hook	Fruit Bat	LEFT HANDED	BROWN HAT	LOUD WHISTLES
Leo Compass	Vine Lasso	Capuchin	RIGHT HANDED	GREEN HAT	SQUEAKY TOYS
Finn Boulder	Smoke Bomb	Tree Frog	LEFT HANDED	BROWN HAT	LOUD WHISTLES
Jax Tracker	Flash Cannon	Tree Frog	RIGHT HANDED	GREEN HAT	LOUD WHISTLES
Sienna Stone	Vine Lasso	Iguana	LEFT HANDED	RED HAT	SQUEAKY TOYS
Prof Oliver	Flash Cannon	Capuchin	RIGHT HANDED	GREEN HAT	LOUD WHISTLES
Ruby Spark	Smoke Bomb	Fruit Bat	LEFT HANDED	BROWN HAT	BRIGHT FLASHES
Barnaby Blythe	Glider Wings	Tree Frog	LEFT HANDED	GREEN HAT	LOUD WHISTLES

Clue 1

Rounding

The fuzzy radar readout rounded the footstep distance to the nearest hundred.

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

370

170

300

170

1300

230

900

1100

500

1700

1300

500

3000

2300

170

300

2300

370

1300

1100

170

1300

500

5000

2900

1300

Round 27 to the nearest tenT

Round 50 to the nearest tenN

Round 366 to the nearest tenH

Round 232 to the nearest tenK

Round 2,323 to the nearest hundredO

Round 263 to the nearest hundredS

Round 899 to the nearest hundredY

Round 2,903 to the nearest thousandD

Round 1,062 to the nearest hundredV

Round 1,324 to the nearest hundredA

Round 1,660 to the nearest hundredL

Round 2,883 to the nearest hundredU

Round 172 to the nearest tenE

Round 544 to the nearest hundredI

Round 4,527 to the nearest thousandG

0/15 letters found

Clue 2

Addition

We tallied all the brass gears collected from the camp supply crate.

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

7840

3034

4734

3878

6787

7840

7743

4734

9017

3884

3878

3884

5581

4734

4380

7840

3034

3884

7743

7520

4734

7520

7840

3697

3884

9099

3263

5135 + 2705 =T

1958 + 2422 =F

2387 + 5356 =N

3570 + 3217 =I

2991 + 1743 =E

1168 + 2716 =A

5538 + 3479 =S

4662 + 2858 =D

1507 + 2371 =W

3271 + 2310 =L

3586 + 5513 =C

1574 + 1689 =K

1833 + 1201 =H

1273 + 2424 =R

0/14 letters found

Clue 3

Subtraction

We subtracted the missing trail markers from the master map count.

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

7579

5249

7851

2987

1133

6986

7516

1133

2786

7301

6986

7851

4655

7301

8673

1544

8154

6986

1544

3914

4655

4527

5249

1133

3402

7579

6986

7851

3402

8560 - 981 =T

1847 - 303 =O

4986 - 3853 =I

9143 - 1627 =A

2997 - 211 =N

8490 - 336 =M

10047 - 1374 =R

11386 - 3535 =E

6835 - 3848 =V

7365 - 3963 =S

5334 - 85 =H

8206 - 3551 =D

6669 - 2142 =W

7955 - 4041 =U

10418 - 3117 =F

7210 - 224 =L

0/16 letters found

Clue 4

Multiplication facts (1-12)

The footprints formed neat equal rows along the muddy riverbank.

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

132

7 × 8 =T

6 × 4 =O

4 × 8 =F

9 × 7 =H

9 × 8 =N

9 × 9 =R

7 × 11 =A

12 × 4 =S

10 × 10 =G

8 × 8 =E

3 × 9 =C

12 × 11 =P

7 × 5 =D

11 × 4 =U

0/14 letters found

Clue 5

Division facts (1-12) — the last clue

We divided the found clue cards 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

9 ÷ 3 = ?

20 ÷ 10 = ?

24 ÷ 6 = ?

120 ÷ 12 = ?

5 ÷ 5 = ?

63 ÷ 7 = ?

42 ÷ 6 = ?

72 ÷ 6 = ?

16 ÷ 2 = ?

10 ÷ 2 = ?

121 ÷ 11 = ?

Step 2 — cross out the sentence with each answer

1.The villain fires a flash cannon, then launches a fruit bat.

2.The villain soars with glider wings, then nudges a tree frog.

3.The villain soars with glider wings, then signals a parrot.

4.The villain swings on a grappling hook, then signals a parrot.

5.The villain swings on a grappling hook, then whistles to a capuchin.

6.The villain swings on a grappling hook, then nudges a tree frog.

7.The villain snares the chest with a vine lasso, then nudges a tree frog.

8.The villain throws a smoke bomb, then nudges a tree frog.

9.The villain snares the chest with a vine lasso, then launches a fruit bat.

10.The villain soars with glider wings, then launches a fruit bat.

11.The villain throws a smoke bomb, then signals a parrot.

12.The villain snares the chest with a vine lasso, then carries an iguana.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Case of the Sunken Temple Compass

Culprit: Toby Ridge (Grappling Hook · Tree Frog · LEFT HANDED · GREEN HAT · LOUD WHISTLES)

Clue 1 (Rounding): "THE SNEAKY VILLAIN DOES NOT HAVE AN IGUANA"
Round 27 to the nearest ten = 30 (T) · Round 50 to the nearest ten = 50 (N) · Round 366 to the nearest ten = 370 (H) · Round 232 to the nearest ten = 230 (K) · Round 2,323 to the nearest hundred = 2300 (O) · Round 263 to the nearest hundred = 300 (S) · Round 899 to the nearest hundred = 900 (Y) · Round 2,903 to the nearest thousand = 3000 (D) · Round 1,062 to the nearest hundred = 1100 (V) · Round 1,324 to the nearest hundred = 1300 (A) · Round 1,660 to the nearest hundred = 1700 (L) · Round 2,883 to the nearest hundred = 2900 (U) · Round 172 to the nearest ten = 170 (E) · Round 544 to the nearest hundred = 500 (I) · Round 4,527 to the nearest thousand = 5000 (G)
Clue 2 (Addition): "THE WITNESS SAW A LEFT HANDED TRACK"
5135 + 2705 = 7840 (T) · 1958 + 2422 = 4380 (F) · 2387 + 5356 = 7743 (N) · 3570 + 3217 = 6787 (I) · 2991 + 1743 = 4734 (E) · 1168 + 2716 = 3884 (A) · 5538 + 3479 = 9017 (S) · 4662 + 2858 = 7520 (D) · 1507 + 2371 = 3878 (W) · 3271 + 2310 = 5581 (L) · 3586 + 5513 = 9099 (C) · 1574 + 1689 = 3263 (K) · 1833 + 1201 = 3034 (H) · 1273 + 2424 = 3697 (R)
Clue 3 (Subtraction): "THE VILLAIN FLED FROM LOUD WHISTLES"
8560 - 981 = 7579 (T) · 1847 - 303 = 1544 (O) · 4986 - 3853 = 1133 (I) · 9143 - 1627 = 7516 (A) · 2997 - 211 = 2786 (N) · 8490 - 336 = 8154 (M) · 10047 - 1374 = 8673 (R) · 11386 - 3535 = 7851 (E) · 6835 - 3848 = 2987 (V) · 7365 - 3963 = 3402 (S) · 5334 - 85 = 5249 (H) · 8206 - 3551 = 4655 (D) · 6669 - 2142 = 4527 (W) · 7955 - 4041 = 3914 (U) · 10418 - 3117 = 7301 (F) · 7210 - 224 = 6986 (L)
Clue 4 (Multiplication facts (1-12)): "THE SCOUT FOUND A GREEN HAT STRAP"
7 × 8 = 56 (T) · 6 × 4 = 24 (O) · 4 × 8 = 32 (F) · 9 × 7 = 63 (H) · 9 × 8 = 72 (N) · 9 × 9 = 81 (R) · 7 × 11 = 77 (A) · 12 × 4 = 48 (S) · 10 × 10 = 100 (G) · 8 × 8 = 64 (E) · 3 × 9 = 27 (C) · 12 × 11 = 132 (P) · 7 × 5 = 35 (D) · 11 × 4 = 44 (U)
Clue 5 (Division facts (1-12)): surviving statement (box 6) → Toby Ridge
9 ÷ 3 = 3 · 20 ÷ 10 = 2 · 24 ÷ 6 = 4 · 120 ÷ 12 = 10 · 5 ÷ 5 = 1 · 63 ÷ 7 = 9 · 42 ÷ 6 = 7 · 72 ÷ 6 = 12 · 16 ÷ 2 = 8 · 10 ÷ 2 = 5 · 121 ÷ 11 = 11

About this mystery

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

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