🦕 DinosaursGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Great Dinosaur Egg Hunt

A rare golden dinosaur egg has vanished from the Dino Valley Research Park! A sneaky thief used prehistoric powers to bypass the security gates. It is up to you to crack the codes, track the footprints, and find the culprit before the egg hatches!

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	Dino Roar	Saddle Gear	Flashlight Use	Crest Color	Dino Treat
Ian Malcolm	Triceratops Bash	GPS Tracker	Left Handed	Bright Green	Sweet Berries
Luis Chiappe	Triceratops Bash	Bubble Shield	Right Handed	Neon Orange	Sweet Berries
John Ostrom	Ankylosaurus Smash	GPS Tracker	Right Handed	Bright Green	Sweet Berries
Othniel Marsh	T-Rex Chomp	Night Vision	Left Handed	Deep Purple	Salty Moss
William Buckland	Ankylosaurus Smash	Bubble Shield	Right Handed	Neon Orange	Sweet Berries
Joan Wiffen	Pterodactyl Glide	GPS Tracker	Right Handed	Bright Green	Sweet Berries
Paul Sereno	Raptor Speed	Night Vision	Left Handed	Deep Purple	Sour Ferns
Patricia Vickers	Raptor Speed	GPS Tracker	Left Handed	Deep Purple	Sour Ferns
Alan Grant	Pterodactyl Glide	Laser Pointer	Right Handed	Bright Green	Sweet Berries
Rex Stone	Raptor Speed	Laser Pointer	Right Handed	Neon Orange	Salty Moss
Roy Chapman	Raptor Speed	Net Launcher	Right Handed	Bright Green	Sweet Berries
Mary Anning	Raptor Speed	Night Vision	Left Handed	Deep Purple	Sweet Berries
Dong Zhiming	Ankylosaurus Smash	Laser Pointer	Left Handed	Deep Purple	Salty Moss
Jack Horner	T-Rex Chomp	Laser Pointer	Right Handed	Bright Green	Sour Ferns
Gideon Mantell	Ankylosaurus Smash	Night Vision	Right Handed	Bright Green	Salty Moss
Barnum Brown	Ankylosaurus Smash	Bubble Shield	Left Handed	Deep Purple	Sour Ferns
Ellie Sattler	Raptor Speed	Night Vision	Right Handed	Neon Orange	Sour Ferns
Steve Brusatte	Ankylosaurus Smash	GPS Tracker	Left Handed	Deep Purple	Salty Moss
Edward Cope	Pterodactyl Glide	GPS Tracker	Right Handed	Neon Orange	Salty Moss
Sue Hendrickson	Triceratops Bash	Laser Pointer	Right Handed	Bright Green	Sweet Berries
Richard Owen	Ankylosaurus Smash	GPS Tracker	Left Handed	Bright Green	Salty Moss

Clue 1

Rounding

The security radar caught the thief escaping, but the radar screen only displays numbers 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.

110

290

500

110

290

4300

500

430

2900

500

3000

200

110

7000

3000

500

370

200

500

110

1100

370

7000

200

2000

290

500

3700

Round 113 to the nearest tenT

Round 2,945 to the nearest hundredD

Round 427 to the nearest tenF

Round 3,722 to the nearest hundredR

Round 193 to the nearest hundredN

Round 3,341 to the nearest thousandS

Round 519 to the nearest hundredE

Round 372 to the nearest tenA

Round 90 to the nearest tenO

Round 1,059 to the nearest hundredL

Round 1,520 to the nearest thousandC

Round 4,272 to the nearest hundredI

Round 7,474 to the nearest thousandU

Round 292 to the nearest tenH

0/14 letters found

Clue 2

Addition

We found giant dinosaur footprints in the mud! Let us add up all the tracks we counted to see which path the thief took.

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

4261

9794

7099

4261

9794

7588

7099

7572

9794

7099

8256

8710

4261

9794

7099

8256

7588

8311

9794

4261

7588

9550

4261

9794

7099

7588

4220

7588

8311

9794

4261

9794

4193

9550

8710

2918 + 1343 =T

5505 + 2806 =G

4162 + 5632 =H

2149 + 2071 =R

4358 + 3214 =F

4634 + 2954 =I

2535 + 1658 =A

2643 + 4456 =E

5790 + 2920 =D

4948 + 3308 =L

4326 + 5224 =N

0/11 letters found

Clue 3

Subtraction

Some fossil tools are missing from the supply shed. Subtract the tools left behind from the total to see what they took.

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

1473

2628

1801

3397

5610

1311

2738

6867

1473

2738

5103

1801

3397

1473

2738

1801

7239

1473

6867

4710

1801

1473

3389

1801

5023

5610

1801

6867

6084 - 4611 =T

5066 - 1677 =B

3789 - 1988 =E

9329 - 2462 =S

5199 - 1802 =D

6061 - 3433 =H

6757 - 4019 =O

5427 - 324 =P

8921 - 4211 =W

3204 - 1893 =N

9274 - 2035 =A

6411 - 1388 =R

10136 - 4526 =I

0/13 letters found

Clue 4

Multiplication facts (1-12)

We found a grid of fossil storage boxes arranged in equal rows. Let us multiply the rows to count the total boxes 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.

120

3 × 9 =W

5 × 11 =G

5 × 9 =S

4 × 7 =M

5 × 7 =H

7 × 10 =O

11 × 6 =T

1 × 4 =F

6 × 12 =E

5 × 6 =L

4 × 10 =U

1 × 1 =D

9 × 9 =R

8 × 8 =A

12 × 10 =B

10 × 8 =I

2 × 7 =N

0/17 letters found

Clue 5

Division facts (1-12) — the last clue

The ranger wants to share the tracking team treats equally among all the rescue dogs. Divide them up to get the final clue.

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

99 ÷ 11 = ?

108 ÷ 9 = ?

9 ÷ 3 = ?

60 ÷ 10 = ?

84 ÷ 12 = ?

99 ÷ 9 = ?

40 ÷ 5 = ?

15 ÷ 3 = ?

24 ÷ 12 = ?

20 ÷ 5 = ?

3 ÷ 3 = ?

Step 2 — cross out the sentence with each answer

1.The villain used a mighty t-rex chomp, then turned on their night vision goggles.

2.The villain cleared the gate with a triceratops bash, then turned on their night vision goggles.

3.The villain escaped using a pterodactyl glide, then aimed a red laser pointer.

4.The villain used a mighty t-rex chomp, then aimed a red laser pointer.

5.The villain ran with incredible raptor speed, then checked their trusty gps tracker.

6.The villain broke the wall with an ankylosaurus smash, then turned on their night vision goggles.

7.The villain escaped using a pterodactyl glide, then turned on their night vision goggles.

8.The villain ran with incredible raptor speed, then aimed a red laser pointer.

9.The villain escaped using a pterodactyl glide, then checked their trusty gps tracker.

10.The villain broke the wall with an ankylosaurus smash, then checked their trusty gps tracker.

11.The villain cleared the gate with a triceratops bash, then fired a rapid net launcher.

12.The villain cleared the gate with a triceratops bash, then aimed a red laser pointer.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Great Dinosaur Egg Hunt

Culprit: John Ostrom (Ankylosaurus Smash · GPS Tracker · Right Handed · Bright Green · Sweet Berries)

Clue 1 (Rounding): "THE THIEF DOES NOT USE A NET LAUNCHER"
Round 113 to the nearest ten = 110 (T) · Round 2,945 to the nearest hundred = 2900 (D) · Round 427 to the nearest ten = 430 (F) · Round 3,722 to the nearest hundred = 3700 (R) · Round 193 to the nearest hundred = 200 (N) · Round 3,341 to the nearest thousand = 3000 (S) · Round 519 to the nearest hundred = 500 (E) · Round 372 to the nearest ten = 370 (A) · Round 90 to the nearest ten = 90 (O) · Round 1,059 to the nearest hundred = 1100 (L) · Round 1,520 to the nearest thousand = 2000 (C) · Round 4,272 to the nearest hundred = 4300 (I) · Round 7,474 to the nearest thousand = 7000 (U) · Round 292 to the nearest ten = 290 (H)
Clue 2 (Addition): "THE THIEF HELD THE LIGHT IN THEIR RIGHT HAND"
2918 + 1343 = 4261 (T) · 5505 + 2806 = 8311 (G) · 4162 + 5632 = 9794 (H) · 2149 + 2071 = 4220 (R) · 4358 + 3214 = 7572 (F) · 4634 + 2954 = 7588 (I) · 2535 + 1658 = 4193 (A) · 2643 + 4456 = 7099 (E) · 5790 + 2920 = 8710 (D) · 4948 + 3308 = 8256 (L) · 4326 + 5224 = 9550 (N)
Clue 3 (Subtraction): "THE DINO STOPPED TO EAT SWEET BERRIES"
6084 - 4611 = 1473 (T) · 5066 - 1677 = 3389 (B) · 3789 - 1988 = 1801 (E) · 9329 - 2462 = 6867 (S) · 5199 - 1802 = 3397 (D) · 6061 - 3433 = 2628 (H) · 6757 - 4019 = 2738 (O) · 5427 - 324 = 5103 (P) · 8921 - 4211 = 4710 (W) · 3204 - 1893 = 1311 (N) · 9274 - 2035 = 7239 (A) · 6411 - 1388 = 5023 (R) · 10136 - 4526 = 5610 (I)
Clue 4 (Multiplication facts (1-12)): "WE FOUND A BRIGHT GREEN HELMET SHARD"
3 × 9 = 27 (W) · 5 × 11 = 55 (G) · 5 × 9 = 45 (S) · 4 × 7 = 28 (M) · 5 × 7 = 35 (H) · 7 × 10 = 70 (O) · 11 × 6 = 66 (T) · 1 × 4 = 4 (F) · 6 × 12 = 72 (E) · 5 × 6 = 30 (L) · 4 × 10 = 40 (U) · 1 × 1 = 1 (D) · 9 × 9 = 81 (R) · 8 × 8 = 64 (A) · 12 × 10 = 120 (B) · 10 × 8 = 80 (I) · 2 × 7 = 14 (N)
Clue 5 (Division facts (1-12)): surviving statement (box 10) → John Ostrom
99 ÷ 11 = 9 · 108 ÷ 9 = 12 · 9 ÷ 3 = 3 · 60 ÷ 10 = 6 · 84 ÷ 12 = 7 · 99 ÷ 9 = 11 · 40 ÷ 5 = 8 · 15 ÷ 3 = 5 · 24 ÷ 12 = 2 · 20 ÷ 5 = 4 · 3 ÷ 3 = 1

About this mystery

Grade level: Grade 4 math
Math topics: Rounding, Addition, Subtraction, Multiplication, Division
Reading level: grades 3-4
Theme: The Great Dinosaur Egg Hunt — set in Dino Valley Research Park
Format: Interactive online & printable worksheet with answer key
Solution: One unique, verified culprit among 21 suspects

More free printable math mysteries

4th grade worksheets Addition worksheets Subtraction worksheets Multiplication worksheets Division worksheets Rounding worksheets All worksheets →

The Mystery of the Missing Master Build

Grade 4

The Great Cosmic Yarn Heist

Grade 4

The Galactic Nebula Heist

Grade 4

The Secrets of the Stone Maze

Grade 4