Grade 4Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Great Dinosaur Island Escapade
Someone has snuck into the Dino Island sanctuary and opened the raptor gates! The Head Ranger needs your help to find the sneaky Dino-Snatcher before the baby T-Rex gets scared.
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 | main gear | escape ride | writing hand | headwear | scare tactic |
|---|---|---|---|---|---|
| Emma Woods | a stun flashlight | a jet pack | right handed | red cap | laser pointer |
| Toby Stark | a plasma rope | a speeder bike | left handed | blue helmet | laser pointer |
| Indiana Jones | a stun flashlight | a speeder bike | left handed | red cap | loud whistle |
| Bindi Irwin | a net launcher | a hover board | right handed | blue helmet | loud whistle |
| Owen Grady | a stun flashlight | a dirt buggy | right handed | red cap | laser pointer |
| Alan Grant | a plasma rope | a speeder bike | left handed | blue helmet | shiny badge |
| Leo Sterling | a plasma rope | a dirt buggy | left handed | safari hat | shiny badge |
| Jack Wilder | a stun flashlight | a speeder bike | left handed | blue helmet | shiny badge |
| Daisy Miller | a net launcher | a speeder bike | left handed | blue helmet | laser pointer |
| Ellie Sattler | a plasma rope | a mini copter | right handed | blue helmet | shiny badge |
| Sam Brody | a walkie talkie | a dirt buggy | left handed | safari hat | shiny badge |
| Annie Carson | a walkie talkie | a dirt buggy | left handed | red cap | loud whistle |
| Maya Lin | a stun flashlight | a speeder bike | right handed | blue helmet | laser pointer |
| Benny Cruz | a stun flashlight | a dirt buggy | right handed | blue helmet | loud whistle |
| Chloe Vance | a net launcher | a mini copter | left handed | red cap | loud whistle |
| Rex Stone | a plasma rope | a mini copter | left handed | blue helmet | laser pointer |
| Roxy Rivera | a net launcher | a speeder bike | right handed | safari hat | shiny badge |
| Zack Ryder | a plasma rope | a hover board | left handed | blue helmet | shiny badge |
| Ian Malcolm | a walkie talkie | a hover board | right handed | red cap | loud whistle |
| Alex Hunter | a map tracker | a speeder bike | left handed | blue helmet | shiny badge |
| Steve Irwin | a net launcher | a speeder bike | left handed | blue helmet | shiny badge |
Clue 1
Rounding
The radar screen in the control room only shows rounded numbers. We have to round the dinosaur herd count to find the first clue.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
70
130
3700
110
1100
4300
1100
200
1700
T
70
3700
2000
3000
30
230
3700
1700
200
30
130
1700
50
3700
300
20
1700
30
300
1100
Round 66 to the nearest tenT
Round 33 to the nearest tenA
Round 113 to the nearest tenY
Round 4,288 to the nearest hundredI
Round 2,592 to the nearest thousandC
Round 3,695 to the nearest hundredE
Round 131 to the nearest tenH
Round 239 to the nearest hundredN
Round 260 to the nearest hundredR
Round 47 to the nearest tenV
Round 2,474 to the nearest thousandS
Round 1,722 to the nearest hundredO
Round 226 to the nearest tenP
Round 1,143 to the nearest hundredD
Round 24 to the nearest tenB
0/15 letters found
Clue 2
Addition
We need to add up all the missing dino treats from the supply room to find where the thief went next.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
8484
5862
5016
7482
3418
7450
3418
T
8484
6336
8529
7314
7450
5016
7096
T
8484
5862
5016
3418
8529
5792
5016
6025
T
8484
5862
3938
8471
7096
T
8484
6336
2140
8529
3418
T
8484
5016
2968 + 5516 =T
3788 + 4741 =R
1803 + 2135 =A
3785 + 2551 =O
1803 + 3213 =E
3268 + 4214 =V
3985 + 3465 =S
1404 + 736 =W
3700 + 2162 =H
2248 + 4848 =D
3645 + 3669 =U
2088 + 3937 =F
2276 + 3516 =L
5578 + 2893 =N
1486 + 1932 =I
0/15 letters found
Clue 3
Subtraction
The security lock needs us to subtract the broken fossil pieces from the total safe count to open the clue drawer.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
T
5271
2714
1922
8942
8204
1835
8030
1835
3226
1835
8942
3226
2714
1922
8030
1835
6670
2714
6059
8030
8942
4901
1835
4519
5341
1922
8959
4527
1835
6670
2714
1922
4519
7064 - 1793 =T
6586 - 3872 =H
7114 - 2595 =D
10504 - 1545 =F
2707 - 872 =A
5870 - 3948 =E
6402 - 3176 =W
9824 - 3154 =S
8759 - 729 =N
9576 - 4675 =B
8696 - 2637 =I
8530 - 3189 =G
5704 - 1177 =L
10317 - 1375 =Y
11410 - 3206 =R
0/15 letters found
Clue 4
Multiplication facts (1-12)
We found rows of muddy footprints. Multiplying the columns of prints will reveal the path the suspect 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.
A
15
96
80
36
70
28
121
49
A
15
20
21
49
33
18
A
15
25
70
80
18
70
121
45
A
15
28
80
70
21
121
96
70
25
55
100
81
5 × 3 =A
3 × 7 =F
9 × 9 =D
10 × 10 =N
8 × 12 =B
5 × 5 =H
10 × 8 =L
5 × 11 =I
10 × 2 =P
5 × 9 =W
11 × 11 =T
10 × 7 =E
7 × 4 =S
3 × 11 =O
6 × 3 =M
4 × 9 =U
7 × 7 =R
0/17 letters found
Clue 5
Division facts (1-12) — the last clue
To unlock the final camera clip, we must share the remaining energy cells equally among the backup generators.
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
36 ÷ 12 = ?
80 ÷ 8 = ?
63 ÷ 7 = ?
60 ÷ 5 = ?
56 ÷ 8 = ?
18 ÷ 9 = ?
64 ÷ 8 = ?
40 ÷ 10 = ?
50 ÷ 10 = ?
1 ÷ 1 = ?
6 ÷ 1 = ?
Step 2 — cross out the sentence with each answer
1.The villain tangled the guard with a plasma rope, then glided over the mud on a hover board.
2.The villain called for backup on a walkie talkie, then glided over the mud on a hover board.
3.The villain fired a net launcher at the raptor, then zoomed away on a speeder bike.
4.The villain used a map tracker to find the nest, then glided over the mud on a hover board.
5.The villain shined a stun flashlight in the cave, then blasted into the sky with a jet pack.
6.The villain fired a net launcher at the raptor, then tore up the trail in a dirt buggy.
7.The villain tangled the guard with a plasma rope, then tore up the trail in a dirt buggy.
8.The villain shined a stun flashlight in the cave, then tore up the trail in a dirt buggy.
9.The villain used a map tracker to find the nest, then zoomed away on a speeder bike.
10.The villain tangled the guard with a plasma rope, then zoomed away on a speeder bike.
11.The villain shined a stun flashlight in the cave, then zoomed away on a speeder bike.
12.The villain called for backup on a walkie talkie, then zoomed away on a speeder bike.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Dinosaur Island Escapade
Culprit: Jack Wilder (a stun flashlight · a speeder bike · left handed · blue helmet · shiny badge)
- Clue 1 (Rounding): "THEY DID NOT ESCAPE ON A HOVER BOARD"Round 66 to the nearest ten = 70 (T) · Round 33 to the nearest ten = 30 (A) · Round 113 to the nearest ten = 110 (Y) · Round 4,288 to the nearest hundred = 4300 (I) · Round 2,592 to the nearest thousand = 3000 (C) · Round 3,695 to the nearest hundred = 3700 (E) · Round 131 to the nearest ten = 130 (H) · Round 239 to the nearest hundred = 200 (N) · Round 260 to the nearest hundred = 300 (R) · Round 47 to the nearest ten = 50 (V) · Round 2,474 to the nearest thousand = 2000 (S) · Round 1,722 to the nearest hundred = 1700 (O) · Round 226 to the nearest ten = 230 (P) · Round 1,143 to the nearest hundred = 1100 (D) · Round 24 to the nearest ten = 20 (B)
- Clue 2 (Addition): "THE VISITOR USED THEIR LEFT HAND TO WRITE"2968 + 5516 = 8484 (T) · 3788 + 4741 = 8529 (R) · 1803 + 2135 = 3938 (A) · 3785 + 2551 = 6336 (O) · 1803 + 3213 = 5016 (E) · 3268 + 4214 = 7482 (V) · 3985 + 3465 = 7450 (S) · 1404 + 736 = 2140 (W) · 3700 + 2162 = 5862 (H) · 2248 + 4848 = 7096 (D) · 3645 + 3669 = 7314 (U) · 2088 + 3937 = 6025 (F) · 2276 + 3516 = 5792 (L) · 5578 + 2893 = 8471 (N) · 1486 + 1932 = 3418 (I)
- Clue 3 (Subtraction): "THEY RAN AWAY WHEN A SHINY BADGE FLASHED"7064 - 1793 = 5271 (T) · 6586 - 3872 = 2714 (H) · 7114 - 2595 = 4519 (D) · 10504 - 1545 = 8959 (F) · 2707 - 872 = 1835 (A) · 5870 - 3948 = 1922 (E) · 6402 - 3176 = 3226 (W) · 9824 - 3154 = 6670 (S) · 8759 - 729 = 8030 (N) · 9576 - 4675 = 4901 (B) · 8696 - 2637 = 6059 (I) · 8530 - 3189 = 5341 (G) · 5704 - 1177 = 4527 (L) · 10317 - 1375 = 8942 (Y) · 11410 - 3206 = 8204 (R)
- Clue 4 (Multiplication facts (1-12)): "A BLUE STRAP FROM A HELMET WAS LEFT BEHIND"5 × 3 = 15 (A) · 3 × 7 = 21 (F) · 9 × 9 = 81 (D) · 10 × 10 = 100 (N) · 8 × 12 = 96 (B) · 5 × 5 = 25 (H) · 10 × 8 = 80 (L) · 5 × 11 = 55 (I) · 10 × 2 = 20 (P) · 5 × 9 = 45 (W) · 11 × 11 = 121 (T) · 10 × 7 = 70 (E) · 7 × 4 = 28 (S) · 3 × 11 = 33 (O) · 6 × 3 = 18 (M) · 4 × 9 = 36 (U) · 7 × 7 = 49 (R)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Jack Wilder36 ÷ 12 = 3 · 80 ÷ 8 = 10 · 63 ÷ 7 = 9 · 60 ÷ 5 = 12 · 56 ÷ 8 = 7 · 18 ÷ 9 = 2 · 64 ÷ 8 = 8 · 40 ÷ 10 = 4 · 50 ÷ 10 = 5 · 1 ÷ 1 = 1 · 6 ÷ 1 = 6
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Great Dinosaur Island Escapade — set in Dino Island Jungle Base
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects