🦕 DinosaursGrade 3Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision
The Great Dino-Rescue Mystery
A sneaky Dino-Snatcher has locked Dr. Rex in the fossil vault and scrambled the dino feeding schedules! We must find the culprit before the baby T-Rex gets grumpy.
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 Style | Park Gear | Handedness | Hair Color | Distraction |
|---|---|---|---|---|---|
| Barry Sembene | T-Rex Roar | Deep Dive | Right-handed writing | Red Hair | Herbivore Treats |
| Ray Arnold | Raptor Speed | Mud Camouflage | Left-handed writing | Dark Hair | Herbivore Treats |
| Lowery Cruthers | Triceratops Shield | Super Jump | Right-handed writing | Sandy Hair | Squeaky Toys |
| Ken Wheatley | Raptor Speed | Mud Camouflage | Left-handed writing | Sandy Hair | Herbivore Treats |
| Ian Malcolm | Ankylosaurus Smash | Mud Camouflage | Left-handed writing | Red Hair | Squeaky Toys |
| Sarah Harding | Triceratops Shield | Lava Proof | Left-handed writing | Red Hair | Herbivore Treats |
| Maisie Lockwood | Triceratops Shield | Deep Dive | Left-handed writing | Red Hair | Squeaky Toys |
| Ben Hildebrand | Pterodactyl Flight | Lava Proof | Right-handed writing | Dark Hair | Shiny Amber |
| Eric Kirby | Triceratops Shield | Deep Dive | Left-handed writing | Dark Hair | Herbivore Treats |
| Nick Van Owen | Pterodactyl Flight | Super Jump | Left-handed writing | Dark Hair | Herbivore Treats |
| Claire Dearing | T-Rex Roar | Super Jump | Left-handed writing | Sandy Hair | Herbivore Treats |
| Vivian Krill | Pterodactyl Flight | Lava Proof | Left-handed writing | Sandy Hair | Squeaky Toys |
| Billy Brennan | Pterodactyl Flight | Night Vision | Left-handed writing | Dark Hair | Herbivore Treats |
| Roland Tembo | Ankylosaurus Smash | Super Jump | Left-handed writing | Red Hair | Herbivore Treats |
| John Hammond | Raptor Speed | Night Vision | Left-handed writing | Dark Hair | Shiny Amber |
| Franklin Webb | T-Rex Roar | Deep Dive | Right-handed writing | Red Hair | Shiny Amber |
| Amanda Kirby | Triceratops Shield | Mud Camouflage | Right-handed writing | Red Hair | Herbivore Treats |
| Henry Wu | Raptor Speed | Mud Camouflage | Left-handed writing | Sandy Hair | Squeaky Toys |
| Owen Grady | Triceratops Shield | Lava Proof | Right-handed writing | Sandy Hair | Squeaky Toys |
| Ellie Sattler | Triceratops Shield | Lava Proof | Left-handed writing | Dark Hair | Herbivore Treats |
| Paul Kirby | Pterodactyl Flight | Super Jump | Right-handed writing | Dark Hair | Herbivore Treats |
Clue 1
Addition
We counted the spare dino-tracking badges in the locker. Adding up the boxes gave us a clue to narrow down our suspect list!
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
357
387
966
204
538
857
649
795
987
T
357
987
844
443
610
T
357
857
834
951
834
649
795
610
610
878
138 + 219 =T
129 + 258 =H
387 + 223 =O
203 + 446 =P
563 + 281 =S
135 + 69 =C
499 + 488 =I
253 + 190 =N
587 + 364 =V
413 + 465 =F
560 + 406 =E
598 + 259 =L
531 + 303 =A
363 + 432 =R
371 + 167 =U
0/15 letters found
Clue 2
Rounding
The camp radar tracked a suspicious runner but could only round the speed to the nearest ten. The rounded number showed us a 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
30
800
80
20
400
600
8000
200
200
60
8000
7000
3000
5000
500
20
900
300
7000
80
5000
8000
T
30
800
T
30
800
80
60
80
700
T
30
800
500
7000
900
Round 32 to the nearest tenT
Round 834 to the nearest hundredH
Round 227 to the nearest hundredB
Round 327 to the nearest hundredO
Round 910 to the nearest hundredD
Round 2,875 to the nearest thousandG
Round 5,063 to the nearest thousandW
Round 64 to the nearest tenL
Round 8,160 to the nearest thousandI
Round 712 to the nearest hundredF
Round 368 to the nearest hundredC
Round 571 to the nearest hundredR
Round 7,094 to the nearest thousandN
Round 22 to the nearest tenS
Round 485 to the nearest hundredA
Round 77 to the nearest tenE
0/16 letters found
Clue 3
Subtraction
We subtracted the eaten dino snacks from the total box. Finding the leftover snacks revealed where the culprit dropped a 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
467
560
568
340
457
568
721
719
444
767
516
580
580
568
444
560
568
767
128
247
651
516
767
568
T
467
767
568
721
T
467
340
628 - 161 =T
656 - 5 =V
965 - 244 =A
576 - 60 =O
957 - 389 =E
924 - 205 =K
249 - 121 =B
463 - 216 =I
689 - 232 =N
776 - 9 =R
554 - 214 =S
755 - 311 =D
738 - 158 =P
949 - 389 =H
0/14 letters found
Clue 4
Multiplication facts (1-12)
We looked at the grids of glowing dino tracks in the mud. Multiplying the rows by the columns cracked open a hidden 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.
D
16
33
99
21
121
56
99
33
2
D
16
121
35
144
20
33
4
99
30
70
99
70
56
99
33
25
25
70
D
16
4
2
56
20
70
12
33
81
70
2 × 8 =D
11 × 11 =S
3 × 11 =A
5 × 5 =P
10 × 7 =E
7 × 3 =K
7 × 8 =T
2 × 2 =I
7 × 5 =O
2 × 10 =H
9 × 9 =G
3 × 10 =W
12 × 12 =F
1 × 2 =N
11 × 9 =R
4 × 3 =C
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
Dr. Rex had to divide the rescue walkie-talkies equally among the search teams. Splitting them up perfectly gave us 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
28 ÷ 4 = ?
4 ÷ 4 = ?
12 ÷ 4 = ?
99 ÷ 9 = ?
24 ÷ 6 = ?
10 ÷ 5 = ?
50 ÷ 10 = ?
30 ÷ 5 = ?
88 ÷ 11 = ?
72 ÷ 6 = ?
10 ÷ 1 = ?
Step 2 — cross out the sentence with each answer
1.The villain soared over the fences with pterodactyl flight, then snuck through the dark with night vision.
2.The villain soared over the fences with pterodactyl flight, then escaped through the deep lake with a deep dive.
3.The villain soared over the fences with pterodactyl flight, then leaped over the high watchtower with a super jump.
4.The villain roared like a mighty T-Rex, then blended into the swamp with mud camouflage.
5.The villain roared like a mighty T-Rex, then walked right over hot rocks with lava proofing.
6.The villain smashed the security gate like an ankylosaurus, then walked right over hot rocks with lava proofing.
7.The villain dashed away with raptor speed, then blended into the swamp with mud camouflage.
8.The villain soared over the fences with pterodactyl flight, then blended into the swamp with mud camouflage.
9.The villain blocked the path with a triceratops shield, then escaped through the deep lake with a deep dive.
10.The villain dashed away with raptor speed, then leaped over the high watchtower with a super jump.
11.The villain smashed the security gate like an ankylosaurus, then leaped over the high watchtower with a super jump.
12.The villain blocked the path with a triceratops shield, then snuck through the dark with night vision.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Dino-Rescue Mystery
Culprit: Eric Kirby (Triceratops Shield · Deep Dive · Left-handed writing · Dark Hair · Herbivore Treats)
- Clue 1 (Addition): "THE CULPRIT IS NOT LAVA PROOF"138 + 219 = 357 (T) · 129 + 258 = 387 (H) · 387 + 223 = 610 (O) · 203 + 446 = 649 (P) · 563 + 281 = 844 (S) · 135 + 69 = 204 (C) · 499 + 488 = 987 (I) · 253 + 190 = 443 (N) · 587 + 364 = 951 (V) · 413 + 465 = 878 (F) · 560 + 406 = 966 (E) · 598 + 259 = 857 (L) · 531 + 303 = 834 (A) · 363 + 432 = 795 (R) · 371 + 167 = 538 (U)
- Clue 2 (Rounding): "THE SCRIBBLING WAS DONE WITH THE LEFT HAND"Round 32 to the nearest ten = 30 (T) · Round 834 to the nearest hundred = 800 (H) · Round 227 to the nearest hundred = 200 (B) · Round 327 to the nearest hundred = 300 (O) · Round 910 to the nearest hundred = 900 (D) · Round 2,875 to the nearest thousand = 3000 (G) · Round 5,063 to the nearest thousand = 5000 (W) · Round 64 to the nearest ten = 60 (L) · Round 8,160 to the nearest thousand = 8000 (I) · Round 712 to the nearest hundred = 700 (F) · Round 368 to the nearest hundred = 400 (C) · Round 571 to the nearest hundred = 600 (R) · Round 7,094 to the nearest thousand = 7000 (N) · Round 22 to the nearest ten = 20 (S) · Round 485 to the nearest hundred = 500 (A) · Round 77 to the nearest ten = 80 (E)
- Clue 3 (Subtraction): "THE SNEAK DROPPED HERBIVORE TREATS"628 - 161 = 467 (T) · 656 - 5 = 651 (V) · 965 - 244 = 721 (A) · 576 - 60 = 516 (O) · 957 - 389 = 568 (E) · 924 - 205 = 719 (K) · 249 - 121 = 128 (B) · 463 - 216 = 247 (I) · 689 - 232 = 457 (N) · 776 - 9 = 767 (R) · 554 - 214 = 340 (S) · 755 - 311 = 444 (D) · 738 - 158 = 580 (P) · 949 - 389 = 560 (H)
- Clue 4 (Multiplication facts (1-12)): "DARK STRANDS OF HAIR WERE TRAPPED IN THE CAGE"2 × 8 = 16 (D) · 11 × 11 = 121 (S) · 3 × 11 = 33 (A) · 5 × 5 = 25 (P) · 10 × 7 = 70 (E) · 7 × 3 = 21 (K) · 7 × 8 = 56 (T) · 2 × 2 = 4 (I) · 7 × 5 = 35 (O) · 2 × 10 = 20 (H) · 9 × 9 = 81 (G) · 3 × 10 = 30 (W) · 12 × 12 = 144 (F) · 1 × 2 = 2 (N) · 11 × 9 = 99 (R) · 4 × 3 = 12 (C)
- Clue 5 (Division facts (1-12)): surviving statement (box 9) → Eric Kirby28 ÷ 4 = 7 · 4 ÷ 4 = 1 · 12 ÷ 4 = 3 · 99 ÷ 9 = 11 · 24 ÷ 6 = 4 · 10 ÷ 5 = 2 · 50 ÷ 10 = 5 · 30 ÷ 5 = 6 · 88 ÷ 11 = 8 · 72 ÷ 6 = 12 · 10 ÷ 1 = 10
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Addition, Rounding, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Great Dino-Rescue Mystery — set in Cretaceous Valley Rescue Center
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects