🦕 DinosaursGrade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision

The Case of the Stolen Dino Egg

Last night someone crept into Thunder Valley Dinosaur Park and swiped the rarest egg of all, a spotted baby Triceratops still waiting to hatch. The mud near the empty nest is full of clues, from torn scales to giant footprints. It is up to you to track down the Egg Snatcher before the sun sets.

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 Kind	Special Trick	Boy or Girl	Scale Color	Weak Spot
Daisy	Ankylosaurus	Booming Roar	Girl	Red	Sneezes at Flowers
Dot	Velociraptor	Booming Roar	Girl	Green	Scared of Thunder
Rumble	Stegosaurus	Tail Smasher	Girl	Green	Ticklish Feet
Tilly	Pteranodon	Booming Roar	Girl	Red	Scared of Thunder
Stomper	Velociraptor	Booming Roar	Girl	Green	Sneezes at Flowers
Bolt	Stegosaurus	Booming Roar	Boy	Red	Sneezes at Flowers
Pip	Stegosaurus	Super Speed	Girl	Green	Scared of Thunder
Sunny	Velociraptor	Strong Swimmer	Boy	Green	Scared of Thunder
Sandy	Pteranodon	Sky Glider	Girl	Red	Sneezes at Flowers
Cera	Velociraptor	Super Speed	Girl	Green	Ticklish Feet
Fang	Stegosaurus	Booming Roar	Boy	Green	Sneezes at Flowers
Goldie	Pteranodon	Tail Smasher	Girl	Brown	Ticklish Feet
Ziggy	Velociraptor	Super Speed	Boy	Red	Sneezes at Flowers
Hazel	Ankylosaurus	Booming Roar	Girl	Green	Sneezes at Flowers
Crunch	Pteranodon	Tail Smasher	Girl	Green	Sneezes at Flowers
Spike	Velociraptor	Booming Roar	Boy	Green	Sneezes at Flowers
Pebbles	Ankylosaurus	Sky Glider	Girl	Brown	Ticklish Feet
Clawdia	Stegosaurus	Booming Roar	Girl	Brown	Sneezes at Flowers
Buddy	Stegosaurus	Tail Smasher	Girl	Green	Sneezes at Flowers
Bronto	Tyrannosaurus	Super Speed	Boy	Brown	Sneezes at Flowers
Tank	Tyrannosaurus	Strong Swimmer	Girl	Green	Sneezes at Flowers

Clue 1

Rounding

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

28000

300

70000

280000

500

47000

28000

1400

300

140

1400

47000

500

3000

28000

280000

700

2800000

47000

28000

47000

310000

Round 27,771 to the nearest thousandT

Round 283,207 to the nearest ten thousandS

Round 73,770 to the nearest ten thousandG

Round 69 to the nearest tenW

Round 349 to the nearest hundredH

Round 2,793,925 to the nearest hundred thousandM

Round 695 to the nearest hundredI

Round 2,524 to the nearest thousandO

Round 541 to the nearest hundredN

Round 53 to the nearest tenE

Round 1,420 to the nearest hundredC

Round 46,744 to the nearest thousandA

Round 308,911 to the nearest ten thousandL

Round 141 to the nearest tenR

0/14 letters found

Clue 2

Addition

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

3985

4695

6623

4289

8774

6645

7392

3985

4695

3985

8801

6623

7241

6696

4114

6623

8774

8202

7241

2327

8774

8202

2408

1731 + 2254 =A

3722 + 2974 =L

3041 + 5161 =O

1411 + 916 =U

4419 + 4355 =N

2926 + 5875 =G

1781 + 2508 =T

3285 + 3360 =E

4085 + 2538 =I

1625 + 3070 =W

2282 + 5110 =S

724 + 1684 =F

4746 + 2495 =R

2528 + 1586 =D

0/14 letters found

Clue 3

Subtraction

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

4343

7729

5274

5905

8022

5085

7829

2309

2370

7829

6062

3518

3046

8465

5451

4343

5402

3518

4722

6661

8465

5905

3518

2719

3518

4343

5905

5402

3046

5274

5905

8820 - 4477 =A

4953 - 2234 =Z

8184 - 3099 =H

10406 - 4501 =N

3801 - 755 =R

5367 - 1849 =E

8901 - 3499 =D

3645 - 1275 =L

4646 - 2337 =F

8843 - 2182 =T

9496 - 1474 =C

11507 - 3778 =B

9313 - 848 =S

7300 - 2578 =I

11061 - 4999 =W

7921 - 2470 =M

11455 - 3626 =O

6807 - 1533 =U

0/18 letters found

Clue 4

Multiplication facts (1–12)

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

9 × 11 =G

8 × 4 =N

2 × 5 =T

4 × 1 =Y

12 × 3 =A

8 × 8 =H

3 × 9 =F

12 × 11 =R

11 × 4 =E

9 × 9 =W

7 × 4 =L

10 × 8 =S

7 × 7 =C

9 × 8 =B

0/14 letters found

Clue 5

Division facts (1–12) — the last 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

72 ÷ 12 = ?

42 ÷ 6 = ?

6 ÷ 3 = ?

60 ÷ 12 = ?

66 ÷ 6 = ?

72 ÷ 9 = ?

40 ÷ 4 = ?

6 ÷ 2 = ?

44 ÷ 11 = ?

11 ÷ 11 = ?

18 ÷ 2 = ?

Step 2 — cross out the sentence with each answer

1.The villain stomps up with giant jaws, then sprints away in a flash.

2.The villain swoops down from the sky, then smashes the gate with its tail.

3.The villain stomps up with giant jaws, then glides over the tall fences.

4.The villain swoops down from the sky, then slips into the water.

5.The villain darts in on quick claws, then glides over the tall fences.

6.The villain swings its spiky tail, then smashes the gate with its tail.

7.The villain rolls in like a heavy tank, then lets out a booming roar.

8.The villain stomps up with giant jaws, then slips into the water.

9.The villain swings its spiky tail, then lets out a booming roar.

10.The villain rolls in like a heavy tank, then glides over the tall fences.

11.The villain stomps up with giant jaws, then smashes the gate with its tail.

12.The villain darts in on quick claws, then lets out a booming roar.

Solve it

Name the culprit

Choose the one suspect left standing.

Answer Key — The Case of the Stolen Dino Egg

Culprit: Stomper (Velociraptor · Booming Roar · Girl · Green · Sneezes at Flowers)

Clue 1 (Rounding): "THE EGG SNATCHER CANNOT SWIM AT ALL"
Round 27,771 to the nearest thousand = 28000 (T) · Round 283,207 to the nearest ten thousand = 280000 (S) · Round 73,770 to the nearest ten thousand = 70000 (G) · Round 69 to the nearest ten = 70 (W) · Round 349 to the nearest hundred = 300 (H) · Round 2,793,925 to the nearest hundred thousand = 2800000 (M) · Round 695 to the nearest hundred = 700 (I) · Round 2,524 to the nearest thousand = 3000 (O) · Round 541 to the nearest hundred = 500 (N) · Round 53 to the nearest ten = 50 (E) · Round 1,420 to the nearest hundred = 1400 (C) · Round 46,744 to the nearest thousand = 47000 (A) · Round 308,911 to the nearest ten thousand = 310000 (L) · Round 141 to the nearest ten = 140 (R)
Clue 2 (Addition): "A WITNESS SAW A GIRL DINO RUN OFF"
1731 + 2254 = 3985 (A) · 3722 + 2974 = 6696 (L) · 3041 + 5161 = 8202 (O) · 1411 + 916 = 2327 (U) · 4419 + 4355 = 8774 (N) · 2926 + 5875 = 8801 (G) · 1781 + 2508 = 4289 (T) · 3285 + 3360 = 6645 (E) · 4085 + 2538 = 6623 (I) · 1625 + 3070 = 4695 (W) · 2282 + 5110 = 7392 (S) · 724 + 1684 = 2408 (F) · 4746 + 2495 = 7241 (R) · 2528 + 1586 = 4114 (D)
Clue 3 (Subtraction): "A BUNCH OF FLOWERS MADE IT SNEEZE AND RUN"
8820 - 4477 = 4343 (A) · 4953 - 2234 = 2719 (Z) · 8184 - 3099 = 5085 (H) · 10406 - 4501 = 5905 (N) · 3801 - 755 = 3046 (R) · 5367 - 1849 = 3518 (E) · 8901 - 3499 = 5402 (D) · 3645 - 1275 = 2370 (L) · 4646 - 2337 = 2309 (F) · 8843 - 2182 = 6661 (T) · 9496 - 1474 = 8022 (C) · 11507 - 3778 = 7729 (B) · 9313 - 848 = 8465 (S) · 7300 - 2578 = 4722 (I) · 11061 - 4999 = 6062 (W) · 7921 - 2470 = 5451 (M) · 11455 - 3626 = 7829 (O) · 6807 - 1533 = 5274 (U)
Clue 4 (Multiplication facts (1–12)): "GREEN SCALES WERE LEFT BY THE NEST"
9 × 11 = 99 (G) · 8 × 4 = 32 (N) · 2 × 5 = 10 (T) · 4 × 1 = 4 (Y) · 12 × 3 = 36 (A) · 8 × 8 = 64 (H) · 3 × 9 = 27 (F) · 12 × 11 = 132 (R) · 11 × 4 = 44 (E) · 9 × 9 = 81 (W) · 7 × 4 = 28 (L) · 10 × 8 = 80 (S) · 7 × 7 = 49 (C) · 9 × 8 = 72 (B)
Clue 5 (Division facts (1–12)): surviving statement (box 12) → Stomper
72 ÷ 12 = 6 · 42 ÷ 6 = 7 · 6 ÷ 3 = 2 · 60 ÷ 12 = 5 · 66 ÷ 6 = 11 · 72 ÷ 9 = 8 · 40 ÷ 4 = 10 · 6 ÷ 2 = 3 · 44 ÷ 11 = 4 · 11 ÷ 11 = 1 · 18 ÷ 2 = 9

About this mystery

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