Grade 4Reading: grades 3-4SubtractionAdditionWord problemsSkip countingDivision

The Mystery of the Sunken Temple

Someone snuck into the camp, opened the vault, and took the ancient golden compass! As the junior detective on the expedition team, you must use math clues and field notes to figure out which suspect took it.

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	Main Gear	Special Tool	Dominant Hand	Hair Color	Weakness
Jack Mercer	Grappling Hook	Map Case	Right Handed	Blonde Hair	Water Sprays
Noah Wilder	Grappling Hook	Brass Compass	Right Handed	Red Hair	Bright Flashlights
Nora Frost	Grappling Hook	Pocket Radio	Left Handed	Dark Hair	Water Sprays
Ivy Quinn	Smoke Grenade	Signal Flare	Left Handed	Blonde Hair	Loud Whistles
Lucas Drake	Smoke Grenade	Pocket Radio	Left Handed	Dark Hair	Loud Whistles
Sam Rivera	Laser Torch	Signal Flare	Right Handed	Red Hair	Loud Whistles
Chloe Brooks	Laser Torch	Gold Spyglass	Right Handed	Blonde Hair	Water Sprays
Aria Bell	Rope Launcher	Brass Compass	Right Handed	Red Hair	Bright Flashlights
Liam Stone	Grappling Hook	Brass Compass	Right Handed	Blonde Hair	Bright Flashlights
Caleb Hayes	Laser Torch	Brass Compass	Left Handed	Blonde Hair	Loud Whistles
Maya Lin	Laser Torch	Map Case	Right Handed	Dark Hair	Bright Flashlights
Ethan Hunt	Laser Torch	Brass Compass	Left Handed	Red Hair	Water Sprays
Finn Connor	Smoke Grenade	Brass Compass	Right Handed	Red Hair	Loud Whistles
Mason Reed	Glider Pack	Pocket Radio	Right Handed	Blonde Hair	Loud Whistles
Mia Zhang	Glider Pack	Brass Compass	Left Handed	Dark Hair	Bright Flashlights
Ruby Vance	Smoke Grenade	Map Case	Right Handed	Red Hair	Water Sprays
Owen West	Grappling Hook	Map Case	Left Handed	Red Hair	Loud Whistles
Zoe Chen	Glider Pack	Pocket Radio	Left Handed	Dark Hair	Water Sprays
Ella Vance	Laser Torch	Gold Spyglass	Right Handed	Red Hair	Loud Whistles
Sofia Cruz	Grappling Hook	Map Case	Right Handed	Red Hair	Loud Whistles
Grace Park	Laser Torch	Brass Compass	Right Handed	Red Hair	Loud Whistles

Clue 1

Subtraction

You check the gear log to see how many supplies remain after the raid.

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

5777

8415

1049

6574

1004

2283

6402

1004

7809

8645

7400

1049

3251

7809

7400

5777

3107

3251

1049

6402

3251

1004

5567

7809

6402

2283

6919

2283

6402

1088

1049

10010 - 4233 =T

4584 - 3496 =R

10933 - 2288 =D

6432 - 865 =G

5344 - 2237 =U

6680 - 4397 =L

7228 - 826 =A

10283 - 3709 =V

7405 - 486 =F

12978 - 4563 =H

12617 - 4808 =N

7645 - 245 =O

4830 - 1579 =S

5446 - 4397 =E

3694 - 2690 =I

0/15 letters found

Clue 2

Addition

You add up all the trail markers found around the temple base.

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

7722

4187

2197

5210

2824

5486

9236

7722

9236

5832

4187

8135

5319

2197

5319

9236

5210

4876

2824

4876

8437

4187

2953

9236

4187

5210

4182 + 3540 =W

1598 + 3278 =D

2770 + 3062 =R

1842 + 1111 =L

3050 + 2269 =H

3495 + 1991 =S

1296 + 2891 =I

6186 + 3050 =A

4059 + 4378 =V

5060 + 3075 =G

1005 + 1192 =T

1559 + 1265 =E

2820 + 2390 =N

0/13 letters found

Clue 3

Word problems

You solve the mystery notes left behind by the cartographer.

Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.

Someonescaredthevillainoffwith

Lead scout found 10 map scrolls yesterday and 7 more today. How many map scrolls in all?L

Lead scout found 6 compass cases yesterday and 2 more today. How many compass cases in all?H

Lead scout found 6 climbing ropes yesterday and 4 more today. How many climbing ropes in all?W

Lead scout found 5 map scrolls yesterday and 47 more today. How many map scrolls in all?O

There were 53 ration bars. 22 were used up. How many ration bars are left?D

Lead scout found 13 map scrolls yesterday and 14 more today. How many map scrolls in all?U

Lead scout lined up 6 rows of 7 map scrolls. How many map scrolls in all?I

0/7 letters found

Clue 4

Skip counting

You count the torch markers spaced evenly along the tunnel 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.

100

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

Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22D

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80A

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

Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33I

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110R

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

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75N

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

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

Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40S

Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70E

0/12 letters found

Clue 5

Division facts (1-12) — the last clue

You divide the recovered energy crystals equally among the team packs.

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

22 ÷ 2 = ?

8 ÷ 4 = ?

7 ÷ 1 = ?

54 ÷ 6 = ?

27 ÷ 9 = ?

55 ÷ 11 = ?

36 ÷ 3 = ?

42 ÷ 7 = ?

80 ÷ 10 = ?

36 ÷ 9 = ?

6 ÷ 6 = ?

Step 2 — cross out the sentence with each answer

1.The villain scaled walls with a rope launcher, then checked the path with a brass compass.

2.The villain escaped using a smoke grenade, then checked the path with a brass compass.

3.The villain soared away on a glider pack, then listened for guards on a pocket radio.

4.The villain escaped using a smoke grenade, then listened for guards on a pocket radio.

5.The villain escaped using a smoke grenade, then marked the route with a signal flare.

6.The villain soared away on a glider pack, then stashed the plans inside a map case.

7.The villain swung with a grappling hook, then stashed the plans inside a map case.

8.The villain escaped using a smoke grenade, then scouted ahead using a gold spyglass.

9.The villain soared away on a glider pack, then checked the path with a brass compass.

10.The villain cut through locks with a laser torch, then checked the path with a brass compass.

11.The villain cut through locks with a laser torch, then scouted ahead using a gold spyglass.

12.The villain scaled walls with a rope launcher, then listened for guards on a pocket radio.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of the Sunken Temple

Culprit: Grace Park (Laser Torch · Brass Compass · Right Handed · Red Hair · Loud Whistles)

Clue 1 (Subtraction): "THE VILLAIN DOES NOT USE A SIGNAL FLARE"
10010 - 4233 = 5777 (T) · 4584 - 3496 = 1088 (R) · 10933 - 2288 = 8645 (D) · 6432 - 865 = 5567 (G) · 5344 - 2237 = 3107 (U) · 6680 - 4397 = 2283 (L) · 7228 - 826 = 6402 (A) · 10283 - 3709 = 6574 (V) · 7405 - 486 = 6919 (F) · 12978 - 4563 = 8415 (H) · 12617 - 4808 = 7809 (N) · 7645 - 245 = 7400 (O) · 4830 - 1579 = 3251 (S) · 5446 - 4397 = 1049 (E) · 3694 - 2690 = 1004 (I)
Clue 2 (Addition): "WITNESS SAW A RIGHT HANDED VILLAIN"
4182 + 3540 = 7722 (W) · 1598 + 3278 = 4876 (D) · 2770 + 3062 = 5832 (R) · 1842 + 1111 = 2953 (L) · 3050 + 2269 = 5319 (H) · 3495 + 1991 = 5486 (S) · 1296 + 2891 = 4187 (I) · 6186 + 3050 = 9236 (A) · 4059 + 4378 = 8437 (V) · 5060 + 3075 = 8135 (G) · 1005 + 1192 = 2197 (T) · 1559 + 1265 = 2824 (E) · 2820 + 2390 = 5210 (N)
Clue 3 (Word problems): "LOUD WHISTLES"
Lead scout found 10 map scrolls yesterday and 7 more today. How many map scrolls in all? = 17 (L) · Lead scout found 6 compass cases yesterday and 2 more today. How many compass cases in all? = 8 (H) · Lead scout found 6 climbing ropes yesterday and 4 more today. How many climbing ropes in all? = 10 (W) · Lead scout found 5 map scrolls yesterday and 47 more today. How many map scrolls in all? = 52 (O) · There were 53 ration bars. 22 were used up. How many ration bars are left? = 31 (D) · Lead scout found 13 map scrolls yesterday and 14 more today. How many map scrolls in all? = 27 (U) · Lead scout lined up 6 rows of 7 map scrolls. How many map scrolls in all? = 42 (I)
Clue 4 (Skip counting): "THE SCENE HAD STRANDS OF RED HAIR"
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80 = 60 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (H) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (R) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (C) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (N) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (E)
Clue 5 (Division facts (1-12)): surviving statement (box 10) → Grace Park
22 ÷ 2 = 11 · 8 ÷ 4 = 2 · 7 ÷ 1 = 7 · 54 ÷ 6 = 9 · 27 ÷ 9 = 3 · 55 ÷ 11 = 5 · 36 ÷ 3 = 12 · 42 ÷ 7 = 6 · 80 ÷ 10 = 8 · 36 ÷ 9 = 4 · 6 ÷ 6 = 1

About this mystery

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

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