Grade 5Reading: grades 5-6MultiplicationSubtractionAdditionFractions of a numberMissing addends

The Mystery of the Sunken Chart

A sneaky Tide Raider snuck into the island map room and snatched the ancient gold-leaf chart! Solve the mystery clues around Sky Reef Island to uncover who 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	Gear Item	Scout Tool	Compass Wrist	Hairstyle	Vulnerability
Ranger Amber	rope launcher	signal flare	right wrist compass	braided hair	bright light
Dr Rex	grappling hook	flash beacon	right wrist compass	spiky hair	bright light
Diver Cleo	glider wings	sonar whistle	left wrist compass	spiky hair	sneeze powder
Racer Chloe	glider wings	signal flare	left wrist compass	slicked hair	bright light
Dr Elena	smoke bombs	sonar whistle	right wrist compass	braided hair	loud whistle
Nav Mason	rope launcher	flash beacon	right wrist compass	spiky hair	sneeze powder
Prof Jade	glider wings	sonar whistle	right wrist compass	braided hair	bright light
Guide Felix	rope launcher	scout drone	left wrist compass	braided hair	sneeze powder
Sailor Kai	grappling hook	pocket telescope	right wrist compass	braided hair	bright light
Pilot Nora	glider wings	flash beacon	right wrist compass	spiky hair	loud whistle
Tracker Holly	smoke bombs	pocket telescope	left wrist compass	spiky hair	loud whistle
Hiker Nina	glider wings	flash beacon	right wrist compass	braided hair	bright light
Scout Tyler	rope launcher	pocket telescope	right wrist compass	slicked hair	loud whistle
Capt Morgan	smoke bombs	flash beacon	left wrist compass	braided hair	bright light
Guide Sam	compass decoder	scout drone	left wrist compass	braided hair	bright light
Explorer Brody	grappling hook	pocket telescope	left wrist compass	slicked hair	sneeze powder
Agent Drake	rope launcher	flash beacon	left wrist compass	spiky hair	sneeze powder
Nav Cruz	smoke bombs	flash beacon	right wrist compass	spiky hair	bright light
Ranger Maya	grappling hook	pocket telescope	right wrist compass	spiky hair	loud whistle
Pilot Jax	glider wings	scout drone	right wrist compass	braided hair	bright light
Tracker Leo	compass decoder	scout drone	left wrist compass	slicked hair	bright light

Clue 1

Multiplication facts (1-12)

The island map grid is divided into equal rows and columns, requiring multiplication to find the total sectors searched.

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

121

132

121

108

5 × 8 =T

11 × 11 =V

12 × 11 =N

7 × 1 =H

10 × 8 =S

12 × 9 =K

11 × 2 =P

10 × 7 =A

11 × 5 =O

5 × 3 =D

3 × 11 =L

2 × 10 =E

1 × 5 =C

3 × 8 =I

0/14 letters found

Clue 2

Subtraction

The path guide checks supply weights before and after crossing the rope bridge, using subtraction to find lost gear.

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

1987

8187

2462

1987

1355

3883

1376

3808

1728

1355

1376

8655

1987

4338

8187

6428

7616

4338

1355

1376

8714

8187

1987

7616

1355

1376

4338

1987

7616

2462

3883

1355

6351 - 4364 =T

8576 - 4693 =A

11146 - 2959 =H

11898 - 3243 =N

4460 - 652 =L

5091 - 3715 =I

4866 - 2404 =E

11036 - 3420 =W

12836 - 4122 =G

3555 - 2200 =R

6980 - 2642 =S

6449 - 21 =O

6056 - 4328 =P

0/13 letters found

Clue 3

Addition

The exploration squad tallies up all bronze dubloons found across three stone ruins to verify the total chest 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.

8185

7252

6674

6296

4073

5242

8578

6674

6296

4073

5242

8185

8578

6674

7302

9827

4912

9827

5242

4073

4912

5242

7252

6310

6674

8578

7252

2339

7302

4912

7252

4535 + 3650 =B

2625 + 2617 =T

4698 + 3880 =L

3577 + 3675 =R

6573 + 3254 =D

3122 + 3174 =G

1804 + 2269 =H

2993 + 3681 =I

2252 + 2660 =E

3093 + 3217 =A

1497 + 842 =U

3833 + 3469 =N

0/12 letters found

Clue 4

Fractions of a number

The navigator calculates what fractional part of the total trail distance has been hiked through the misty valley.

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

1/5 of 190 =B

1/8 of 176 =O

1/4 of 16 =E

1/2 of 34 =H

1/2 of 64 =W

1/3 of 48 =S

3/5 of 55 =G

1/2 of 18 =D

2/6 of 33 =I

1/4 of 156 =T

2/10 of 65 =J

1/3 of 111 =A

1/3 of 21 =R

1/4 of 120 =U

4/8 of 80 =N

6/8 of 48 =L

0/16 letters found

Clue 5

Missing addends — the last clue

The puzzle door on the ancient vault needs a final code number to balance the total weight required on the stone pedestal.

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

35 + ___ = 38

36 + ___ = 40

35 + ___ = 36

3 + ___ = 8

2 + ___ = 10

24 + ___ = 35

19 + ___ = 21

13 + ___ = 19

28 + ___ = 35

25 + ___ = 34

5 + ___ = 15

Step 2 — cross out the sentence with each answer

1.The villain glided over the treeline, then blew a high sonar whistle.

2.The villain decoded the secret chart, then sent out a small scout drone.

3.The villain glided over the treeline, then sent out a small scout drone.

4.The villain fired a sturdy climbing line, then launched a glowing signal flare.

5.The villain swung across the canyon, then blew a high sonar whistle.

6.The villain swung across the canyon, then sent out a small scout drone.

7.The villain decoded the secret chart, then spotted distant landmarks.

8.The villain threw a dense smoke cloud, then spotted distant landmarks.

9.The villain decoded the secret chart, then launched a glowing signal flare.

10.The villain fired a sturdy climbing line, then blew a high sonar whistle.

11.The villain fired a sturdy climbing line, then flashed a bright beacon signal.

12.The villain glided over the treeline, then flashed a bright beacon signal.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of the Sunken Chart

Culprit: Hiker Nina (glider wings · flash beacon · right wrist compass · braided hair · bright light)

Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT HAVE A POCKET TELESCOPE"
5 × 8 = 40 (T) · 11 × 11 = 121 (V) · 12 × 11 = 132 (N) · 7 × 1 = 7 (H) · 10 × 8 = 80 (S) · 12 × 9 = 108 (K) · 11 × 2 = 22 (P) · 10 × 7 = 70 (A) · 11 × 5 = 55 (O) · 5 × 3 = 15 (D) · 3 × 11 = 33 (L) · 2 × 10 = 20 (E) · 1 × 5 = 5 (C) · 3 × 8 = 24 (I)
Clue 2 (Subtraction): "THE TRAIL PRINT SHOWS RIGHT WRIST WEAR"
6351 - 4364 = 1987 (T) · 8576 - 4693 = 3883 (A) · 11146 - 2959 = 8187 (H) · 11898 - 3243 = 8655 (N) · 4460 - 652 = 3808 (L) · 5091 - 3715 = 1376 (I) · 4866 - 2404 = 2462 (E) · 11036 - 3420 = 7616 (W) · 12836 - 4122 = 8714 (G) · 3555 - 2200 = 1355 (R) · 6980 - 2642 = 4338 (S) · 6449 - 21 = 6428 (O) · 6056 - 4328 = 1728 (P)
Clue 3 (Addition): "BRIGHT LIGHT BLINDED THE TRAIL RUNNER"
4535 + 3650 = 8185 (B) · 2625 + 2617 = 5242 (T) · 4698 + 3880 = 8578 (L) · 3577 + 3675 = 7252 (R) · 6573 + 3254 = 9827 (D) · 3122 + 3174 = 6296 (G) · 1804 + 2269 = 4073 (H) · 2993 + 3681 = 6674 (I) · 2252 + 2660 = 4912 (E) · 3093 + 3217 = 6310 (A) · 1497 + 842 = 2339 (U) · 3833 + 3469 = 7302 (N)
Clue 4 (Fractions of a number): "BRAIDED HAIR WAS SNAGGED ON A JUNGLE THORN"
1/5 of 190 = 38 (B) · 1/8 of 176 = 22 (O) · 1/4 of 16 = 4 (E) · 1/2 of 34 = 17 (H) · 1/2 of 64 = 32 (W) · 1/3 of 48 = 16 (S) · 3/5 of 55 = 33 (G) · 1/2 of 18 = 9 (D) · 2/6 of 33 = 11 (I) · 1/4 of 156 = 39 (T) · 2/10 of 65 = 13 (J) · 1/3 of 111 = 37 (A) · 1/3 of 21 = 7 (R) · 1/4 of 120 = 30 (U) · 4/8 of 80 = 40 (N) · 6/8 of 48 = 36 (L)
Clue 5 (Missing addends): surviving statement (box 12) → Hiker Nina
35 + ___ = 38 = 3 · 36 + ___ = 40 = 4 · 35 + ___ = 36 = 1 · 3 + ___ = 8 = 5 · 2 + ___ = 10 = 8 · 24 + ___ = 35 = 11 · 19 + ___ = 21 = 2 · 13 + ___ = 19 = 6 · 28 + ___ = 35 = 7 · 25 + ___ = 34 = 9 · 5 + ___ = 15 = 10

About this mystery

Grade level: Grade 5 math
Math topics: Multiplication, Subtraction, Addition, Fractions of a number, Missing addends
Reading level: grades 5-6
Theme: The Mystery of the Sunken Chart — set in Sky Reef Island
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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