Grade 4Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision

The Crystal Map Mystery

A sneaky rogue explorer snuck into the Sunken Temple of Coral Key and snatched the legendary Crystal Map! Clues were left behind on the stone tiles. Help the Explorer Squad gather evidence and catch the villain!

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 Tool	Special Gear	Glove Style	Hairstyle	Secret Weakness
Nina Swift	grappling hook	jetpack harness	wears left glove	curly buzzcut	sticky net
Elena Cruz	glider wings	underwater boots	wears left glove	curly buzzcut	sticky net
Skye Wild	night goggles	jetpack harness	wears left glove	spiky crewcut	loud whistles
Ruby Vance	smoke bomb	mega magnet	wears right glove	spiky crewcut	loud whistles
Nora Finch	smoke bomb	underwater boots	wears left glove	curly buzzcut	bright flashlights
Piper Gale	smoke bomb	jetpack harness	wears left glove	spiky crewcut	sticky net
Amber Coast	smoke bomb	underwater boots	wears left glove	curly buzzcut	sticky net
Cole Canyon	smoke bomb	mini drone	wears left glove	curly buzzcut	sticky net
Zane Blaze	night goggles	jetpack harness	wears left glove	curly buzzcut	sticky net
Brody Stone	smoke bomb	jetpack harness	wears right glove	spiky crewcut	bright flashlights
Sam Ridge	smoke bomb	mega magnet	wears right glove	curly buzzcut	bright flashlights
Jax Rivers	night goggles	laser torch	wears right glove	curly buzzcut	loud whistles
Cody Reed	night goggles	mini drone	wears left glove	curly buzzcut	loud whistles
Toby Marsh	compass tracker	mega magnet	wears right glove	curly buzzcut	sticky net
Finn Skylar	compass tracker	jetpack harness	wears right glove	braided ponytail	bright flashlights
Tess Drake	smoke bomb	underwater boots	wears right glove	curly buzzcut	sticky net
Kai Sterling	smoke bomb	underwater boots	wears left glove	spiky crewcut	bright flashlights
Hazel Brook	smoke bomb	jetpack harness	wears left glove	spiky crewcut	bright flashlights
Ivy Rhodes	smoke bomb	laser torch	wears left glove	spiky crewcut	sticky net
Milo West	night goggles	laser torch	wears left glove	braided ponytail	sticky net
Dax Horizon	smoke bomb	underwater boots	wears left glove	braided ponytail	sticky net

Clue 1

Addition

You combine all the artifact rubbings collected from the temple floor to calculate the total code strength.

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

8125

7987

5744

6097

9539

5744

6360

7136

3904

9362

4149

6248

3082

5744

9379

4149

5744

6097

9539

4149

8125

3082

6097

5744

6360

2321

2306

9539

2306

9379

9362

4149

9539

5744

5259 + 2866 =T

6047 + 3315 =R

1425 + 2479 =Y

2948 + 5039 =H

1036 + 2046 =U

6230 + 3149 =D

2778 + 2966 =E

2389 + 1760 =O

3587 + 3549 =K

6541 + 2998 =N

1274 + 1047 =M

1392 + 914 =I

3669 + 2691 =A

3328 + 2920 =G

4143 + 1954 =S

0/15 letters found

Clue 2

Rounding

The temple sonar scanner gives an estimate of nearby energy readings rounded 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.

4300

1100

2300

3700

500

230

4300

230

900

5000

2300

300

230

3700

1700

500

2300

230

2900

2000

3700

2300

300

1100

430

Round 4,290 to the nearest hundredW

Round 19 to the nearest tenE

Round 533 to the nearest hundredS

Round 902 to the nearest hundredL

Round 1,699 to the nearest thousandO

Round 226 to the nearest tenA

Round 5,254 to the nearest thousandF

Round 69 to the nearest tenR

Round 316 to the nearest hundredH

Round 1,740 to the nearest hundredD

Round 3,662 to the nearest hundredN

Round 1,133 to the nearest hundredI

Round 2,943 to the nearest hundredP

Round 431 to the nearest tenG

Round 2,258 to the nearest hundredT

0/15 letters found

Clue 3

Subtraction

You compare the total number of ancient gold coins against what remains in the vault to find the difference.

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

6177

3983

6700

4685

4666

3115

8888

4666

1541

3620

7139

6177

8888

1541

3620

3115

6700

6774

4666

1541

8888

8892

6177

4666

7086

5270

8622

1541

6700

6177

10097 - 3920 =T

6388 - 3273 =L

8351 - 1577 =D

13010 - 4122 =A

7217 - 131 =C

7569 - 2903 =I

7796 - 4176 =G

5008 - 323 =V

8509 - 4526 =H

5610 - 4069 =N

11030 - 4330 =E

9779 - 2640 =O

12906 - 4284 =Y

6891 - 1621 =K

12312 - 3420 =S

0/15 letters found

Clue 4

Multiplication facts (1-12)

You count the carved stone tiles on the wall arranged in neat equal rows and columns.

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

6 × 12 =F

12 × 3 =Z

12 × 7 =N

4 × 12 =R

5 × 6 =M

7 × 6 =D

11 × 1 =S

4 × 10 =P

3 × 1 =C

8 × 7 =Y

9 × 11 =L

11 × 5 =H

7 × 10 =B

5 × 3 =A

1 × 8 =G

2 × 5 =T

11 × 7 =U

1 × 7 =O

1 × 1 =I

0/19 letters found

Clue 5

Division facts (1-12) — the last clue

You divide the total bundle of explorer ropes equally among your team members before heading inside.

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

21 ÷ 3 = ?

33 ÷ 3 = ?

32 ÷ 4 = ?

48 ÷ 4 = ?

20 ÷ 10 = ?

5 ÷ 5 = ?

24 ÷ 6 = ?

9 ÷ 3 = ?

50 ÷ 10 = ?

110 ÷ 11 = ?

42 ÷ 7 = ?

Step 2 — cross out the sentence with each answer

1.The villain vanished into thin air using a smoke bomb, then cut through the heavy iron lock with a laser torch.

2.The villain tracked the secret path using a compass tracker, then snatched the golden key using a mega magnet.

3.The villain tracked the secret path using a compass tracker, then cut through the heavy iron lock with a laser torch.

4.The villain swung across the canyon with a grappling hook, then snatched the golden key using a mega magnet.

5.The villain tracked the secret path using a compass tracker, then marched through deep water with underwater boots.

6.The villain navigated the dark cave with night goggles, then scouted ahead using a mini drone.

7.The villain soared over the treetops with glider wings, then marched through deep water with underwater boots.

8.The villain swung across the canyon with a grappling hook, then boosted over walls using a jetpack harness.

9.The villain navigated the dark cave with night goggles, then boosted over walls using a jetpack harness.

10.The villain soared over the treetops with glider wings, then snatched the golden key using a mega magnet.

11.The villain vanished into thin air using a smoke bomb, then marched through deep water with underwater boots.

12.The villain soared over the treetops with glider wings, then scouted ahead using a mini drone.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Crystal Map Mystery

Culprit: Zane Blaze (night goggles · jetpack harness · wears left glove · curly buzzcut · sticky net)

Clue 1 (Addition): "THE SNEAKY ROGUE DOES NOT USE A MINI DRONE"
5259 + 2866 = 8125 (T) · 6047 + 3315 = 9362 (R) · 1425 + 2479 = 3904 (Y) · 2948 + 5039 = 7987 (H) · 1036 + 2046 = 3082 (U) · 6230 + 3149 = 9379 (D) · 2778 + 2966 = 5744 (E) · 2389 + 1760 = 4149 (O) · 3587 + 3549 = 7136 (K) · 6541 + 2998 = 9539 (N) · 1274 + 1047 = 2321 (M) · 1392 + 914 = 2306 (I) · 3669 + 2691 = 6360 (A) · 3328 + 2920 = 6248 (G) · 4143 + 1954 = 6097 (S)
Clue 2 (Rounding): "WITNESS SAW A LEFT HANDED STRAP ON THE RIG"
Round 4,290 to the nearest hundred = 4300 (W) · Round 19 to the nearest ten = 20 (E) · Round 533 to the nearest hundred = 500 (S) · Round 902 to the nearest hundred = 900 (L) · Round 1,699 to the nearest thousand = 2000 (O) · Round 226 to the nearest ten = 230 (A) · Round 5,254 to the nearest thousand = 5000 (F) · Round 69 to the nearest ten = 70 (R) · Round 316 to the nearest hundred = 300 (H) · Round 1,740 to the nearest hundred = 1700 (D) · Round 3,662 to the nearest hundred = 3700 (N) · Round 1,133 to the nearest hundred = 1100 (I) · Round 2,943 to the nearest hundred = 2900 (P) · Round 431 to the nearest ten = 430 (G) · Round 2,258 to the nearest hundred = 2300 (T)
Clue 3 (Subtraction): "THE VILLAIN GOT TANGLED IN A STICKY NET"
10097 - 3920 = 6177 (T) · 6388 - 3273 = 3115 (L) · 8351 - 1577 = 6774 (D) · 13010 - 4122 = 8888 (A) · 7217 - 131 = 7086 (C) · 7569 - 2903 = 4666 (I) · 7796 - 4176 = 3620 (G) · 5008 - 323 = 4685 (V) · 8509 - 4526 = 3983 (H) · 5610 - 4069 = 1541 (N) · 11030 - 4330 = 6700 (E) · 9779 - 2640 = 7139 (O) · 12906 - 4284 = 8622 (Y) · 6891 - 1621 = 5270 (K) · 12312 - 3420 = 8892 (S)
Clue 4 (Multiplication facts (1-12)): "FOUND TIGHT LOOPS FROM A CURLY BUZZCUT"
6 × 12 = 72 (F) · 12 × 3 = 36 (Z) · 12 × 7 = 84 (N) · 4 × 12 = 48 (R) · 5 × 6 = 30 (M) · 7 × 6 = 42 (D) · 11 × 1 = 11 (S) · 4 × 10 = 40 (P) · 3 × 1 = 3 (C) · 8 × 7 = 56 (Y) · 9 × 11 = 99 (L) · 11 × 5 = 55 (H) · 7 × 10 = 70 (B) · 5 × 3 = 15 (A) · 1 × 8 = 8 (G) · 2 × 5 = 10 (T) · 11 × 7 = 77 (U) · 1 × 7 = 7 (O) · 1 × 1 = 1 (I)
Clue 5 (Division facts (1-12)): surviving statement (box 9) → Zane Blaze
21 ÷ 3 = 7 · 33 ÷ 3 = 11 · 32 ÷ 4 = 8 · 48 ÷ 4 = 12 · 20 ÷ 10 = 2 · 5 ÷ 5 = 1 · 24 ÷ 6 = 4 · 9 ÷ 3 = 3 · 50 ÷ 10 = 5 · 110 ÷ 11 = 10 · 42 ÷ 7 = 6

About this mystery

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

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