Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Mystery of the Missing Telescope

The shiny Golden Telescope is missing from the Camp Oakwood lookout tower! Someone took it right before the big stargazing night. We need to follow the trail and find out who did 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	Adventure Skill	Secret Tool	Writing Hand	Hair Style	Greatest Fear
Ethan	Kayak Paddling	Night Vision Goggles	Right-Handed	Spiky Hair	Fear of Heights
Maya	Map Reading	Laser Pointer	Right-Handed	Ponytail	Fear of Spiders
Max	Campfire Cooking	Laser Pointer	Right-Handed	Ponytail	Fear of Heights
Emma	Map Reading	Decoder Ring	Right-Handed	Curly Hair	Fear of Heights
Noah	Rope Climbing	Pocket Compass	Right-Handed	Curly Hair	Fear of Heights
Ben	Campfire Cooking	Night Vision Goggles	Right-Handed	Ponytail	Fear of Spiders
Mia	Ruins Exploring	Pocket Compass	Left-Handed	Ponytail	Fear of Spiders
Ruby	Rope Climbing	Laser Pointer	Right-Handed	Spiky Hair	Fear of Spiders
Luke	Campfire Cooking	Laser Pointer	Right-Handed	Curly Hair	Fear of Spiders
Sophia	Ruins Exploring	Decoder Ring	Right-Handed	Ponytail	Fear of Spiders
Grace	Ruins Exploring	Night Vision Goggles	Left-Handed	Curly Hair	Fear of Spiders
Eli	Ruins Exploring	Decoder Ring	Left-Handed	Curly Hair	Fear of Mud
Jack	Ruins Exploring	Night Vision Goggles	Right-Handed	Spiky Hair	Fear of Heights
Harper	Kayak Paddling	Decoder Ring	Right-Handed	Spiky Hair	Fear of Spiders
Mason	Campfire Cooking	Pocket Compass	Right-Handed	Ponytail	Fear of Spiders
Logan	Rope Climbing	Grappling Hook	Left-Handed	Spiky Hair	Fear of Heights
Ava	Campfire Cooking	Pocket Compass	Right-Handed	Ponytail	Fear of Heights
Owen	Rope Climbing	Decoder Ring	Left-Handed	Spiky Hair	Fear of Heights
Zoe	Campfire Cooking	Laser Pointer	Right-Handed	Ponytail	Fear of Spiders
Leo	Ruins Exploring	Decoder Ring	Left-Handed	Spiky Hair	Fear of Spiders
Chloe	Map Reading	Grappling Hook	Left-Handed	Ponytail	Fear of Spiders

Clue 1

Rounding

We found a broken digital tracker near the tower. The screen is cracked, so it only displays distances that are rounded to the nearest ten.

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

130

1700

2300

130

1700

700

2300

5000

290

2300

1100

290

130

200

1100

2300

700

3700

1700

130

2900

700

1100

700

290

3700

290

3700

170

2300

1100

Round 128 to the nearest tenT

Round 4,711 to the nearest thousandF

Round 87 to the nearest tenN

Round 688 to the nearest hundredI

Round 1,108 to the nearest hundredS

Round 1,736 to the nearest hundredH

Round 2,276 to the nearest hundredE

Round 2,863 to the nearest hundredV

Round 170 to the nearest tenL

Round 288 to the nearest tenO

Round 70 to the nearest tenD

Round 173 to the nearest hundredU

Round 3,696 to the nearest hundredG

0/13 letters found

Clue 2

Addition

The junior rangers gathered all the scrap paper left at the scene. We must add up the pieces to find our next direction.

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

5806

5872

9160

9735

6665

9735

2993

9160

4885

5806

4788

9800

3901

2993

9160

4788

6187

9800

6232

3234

5872

5806

5872

6187

2391

4788

9160

4788

3234

7152

3901

7415

9160

3621 + 2185 =T

2987 + 3245 =I

750 + 1641 =N

6696 + 3039 =S

1517 + 2384 =O

2760 + 4392 =L

3540 + 3875 =V

6155 + 3005 =E

2088 + 905 =P

2961 + 3704 =U

2532 + 3340 =H

988 + 2246 =G

2123 + 4064 =A

2893 + 1895 =D

2267 + 2618 =C

3791 + 6009 =R

0/16 letters found

Clue 3

Subtraction

A box of trail mix was dropped on the path. We need to subtract the spilled pieces to see how much food the suspect has left.

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

6025

3490

2234

6025

3490

2526

2234

3527

4744

4474

6810

4474

8492

4474

3086

3527

4744

6427

4970

4474

6025

2526

6810

3086

5762

7418

2526

2887

2234

4744

10810 - 4785 =T

5141 - 397 =R

4666 - 1580 =Y

6498 - 3611 =D

8121 - 3647 =A

11565 - 3073 =W

5316 - 3082 =E

9678 - 3916 =S

4877 - 2351 =I

7364 - 554 =N

8727 - 2300 =O

6494 - 3004 =H

11862 - 4444 =P

3734 - 207 =F

9895 - 4925 =M

0/15 letters found

Clue 4

Multiplication facts (1-12)

We discovered a grid of dusty footprints shaped like a perfect square. Let us multiply the rows to find out how many steps 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.

132

3 × 8 =A

11 × 1 =G

9 × 9 =H

12 × 8 =I

1 × 7 =Y

8 × 2 =E

3 × 5 =M

2 × 6 =N

4 × 5 =W

6 × 12 =T

3 × 9 =P

7 × 9 =F

8 × 11 =O

5 × 12 =R

8 × 7 =L

12 × 11 =S

0/16 letters found

Clue 5

Division facts (1-12) — the last clue

The search party found a bundle of clue sheets. We must divide them equally among our teams so everyone can hunt at the same time.

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

16 ÷ 4 = ?

54 ÷ 9 = ?

96 ÷ 12 = ?

35 ÷ 5 = ?

50 ÷ 5 = ?

99 ÷ 11 = ?

22 ÷ 2 = ?

12 ÷ 6 = ?

24 ÷ 2 = ?

10 ÷ 10 = ?

33 ÷ 11 = ?

Step 2 — cross out the sentence with each answer

1.The villain paddled across the lake, then snatched the prize.

2.The villain paddled across the lake, then grabbed the golden telescope.

3.The villain swung on a vine, then snatched the prize.

4.The villain decoded the secret message, then pushed the hidden button.

5.The villain solved the ancient puzzle, then pushed the hidden button.

6.The villain decoded the secret message, then unlocked the stone chest.

7.The villain paddled across the lake, then unlocked the stone chest.

8.The villain climbed the cliffside, then shined a light on the map.

9.The villain paddled across the lake, then shined a light on the map.

10.The villain decoded the secret message, then shined a light on the map.

11.The villain paddled across the lake, then pushed the hidden button.

12.The villain swung on a vine, then grabbed the golden telescope.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Mystery of the Missing Telescope

Culprit: Maya (Map Reading · Laser Pointer · Right-Handed · Ponytail · Fear of Spiders)

Clue 1 (Rounding): "THE THIEF DOES NOT USE NIGHT VISION GOGGLES"
Round 128 to the nearest ten = 130 (T) · Round 4,711 to the nearest thousand = 5000 (F) · Round 87 to the nearest ten = 90 (N) · Round 688 to the nearest hundred = 700 (I) · Round 1,108 to the nearest hundred = 1100 (S) · Round 1,736 to the nearest hundred = 1700 (H) · Round 2,276 to the nearest hundred = 2300 (E) · Round 2,863 to the nearest hundred = 2900 (V) · Round 170 to the nearest ten = 170 (L) · Round 288 to the nearest ten = 290 (O) · Round 70 to the nearest ten = 70 (D) · Round 173 to the nearest hundred = 200 (U) · Round 3,696 to the nearest hundred = 3700 (G)
Clue 2 (Addition): "THE SUSPECT DROPPED A RIGHT HANDED GLOVE"
3621 + 2185 = 5806 (T) · 2987 + 3245 = 6232 (I) · 750 + 1641 = 2391 (N) · 6696 + 3039 = 9735 (S) · 1517 + 2384 = 3901 (O) · 2760 + 4392 = 7152 (L) · 3540 + 3875 = 7415 (V) · 6155 + 3005 = 9160 (E) · 2088 + 905 = 2993 (P) · 2961 + 3704 = 6665 (U) · 2532 + 3340 = 5872 (H) · 988 + 2246 = 3234 (G) · 2123 + 4064 = 6187 (A) · 2893 + 1895 = 4788 (D) · 2267 + 2618 = 4885 (C) · 3791 + 6009 = 9800 (R)
Clue 3 (Subtraction): "THE THIEF RAN AWAY FROM A TINY SPIDER"
10810 - 4785 = 6025 (T) · 5141 - 397 = 4744 (R) · 4666 - 1580 = 3086 (Y) · 6498 - 3611 = 2887 (D) · 8121 - 3647 = 4474 (A) · 11565 - 3073 = 8492 (W) · 5316 - 3082 = 2234 (E) · 9678 - 3916 = 5762 (S) · 4877 - 2351 = 2526 (I) · 7364 - 554 = 6810 (N) · 8727 - 2300 = 6427 (O) · 6494 - 3004 = 3490 (H) · 11862 - 4444 = 7418 (P) · 3734 - 207 = 3527 (F) · 9895 - 4925 = 4970 (M)
Clue 4 (Multiplication facts (1-12)): "A LONG HAIR FROM A PONYTAIL WAS LEFT"
3 × 8 = 24 (A) · 11 × 1 = 11 (G) · 9 × 9 = 81 (H) · 12 × 8 = 96 (I) · 1 × 7 = 7 (Y) · 8 × 2 = 16 (E) · 3 × 5 = 15 (M) · 2 × 6 = 12 (N) · 4 × 5 = 20 (W) · 6 × 12 = 72 (T) · 3 × 9 = 27 (P) · 7 × 9 = 63 (F) · 8 × 11 = 88 (O) · 5 × 12 = 60 (R) · 8 × 7 = 56 (L) · 12 × 11 = 132 (S)
Clue 5 (Division facts (1-12)): surviving statement (box 5) → Maya
16 ÷ 4 = 4 · 54 ÷ 9 = 6 · 96 ÷ 12 = 8 · 35 ÷ 5 = 7 · 50 ÷ 5 = 10 · 99 ÷ 11 = 9 · 22 ÷ 2 = 11 · 12 ÷ 6 = 2 · 24 ÷ 2 = 12 · 10 ÷ 10 = 1 · 33 ÷ 11 = 3

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Mystery of the Missing Telescope — set in Camp Oakwood
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

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