🦕 DinosaursGrade 3Reading: grades 3-4MultiplicationRoundingAdditionSubtractionDivision
The Secret of Dino Ridge
Someone snuck into Dino Ridge Camp and scrambled all the fossil maps! Use your detective skills to 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 | Dino Partner | Fossil Gear | Watch Hand | Hat Style | Distraction Tool |
|---|---|---|---|---|---|
| Dr. Barnum Brown | Ankylo Helper | Bone Compass | Right Handed | Safari Fedora | Shiny Mirror |
| Crew Chris | Ankylo Helper | Amber Scanner | Left Handed | Feathered Cap | Fruity Treat |
| Dr. Alan Grant | Triceratops Mount | Rope Launcher | Right Handed | Safari Fedora | Shiny Mirror |
| Hunter Hannah | Raptor Companion | Gravel Shovel | Left Handed | Safari Fedora | Squeaky Toy |
| Scout Sam | Triceratops Mount | Sonic Whistle | Left Handed | Feathered Cap | Shiny Mirror |
| Trapper Tina | Stegosaurus Guard | Sonic Whistle | Left Handed | Leather Helmet | Squeaky Toy |
| Mason Max | Stegosaurus Guard | Rope Launcher | Left Handed | Feathered Cap | Fruity Treat |
| Rover Rita | Stegosaurus Guard | Bone Compass | Right Handed | Safari Fedora | Fruity Treat |
| Professor Pete | Pterodactyl Scout | Rope Launcher | Left Handed | Safari Fedora | Fruity Treat |
| Guide Gary | Stegosaurus Guard | Amber Scanner | Left Handed | Safari Fedora | Shiny Mirror |
| Officer Owen | Stegosaurus Guard | Bone Compass | Left Handed | Safari Fedora | Shiny Mirror |
| Camper Chloe | Raptor Companion | Bone Compass | Left Handed | Leather Helmet | Squeaky Toy |
| Tech Tyler | Ankylo Helper | Amber Scanner | Right Handed | Feathered Cap | Fruity Treat |
| Ranger Rex | Raptor Companion | Bone Compass | Left Handed | Feathered Cap | Fruity Treat |
| Dr. Mary Anning | Raptor Companion | Rope Launcher | Left Handed | Feathered Cap | Fruity Treat |
| Fossil Frank | Ankylo Helper | Rope Launcher | Left Handed | Feathered Cap | Fruity Treat |
| Dino Dan | Ankylo Helper | Amber Scanner | Left Handed | Safari Fedora | Fruity Treat |
| Officer Olivia | Stegosaurus Guard | Gravel Shovel | Right Handed | Leather Helmet | Shiny Mirror |
| Pilot Piper | Stegosaurus Guard | Amber Scanner | Left Handed | Feathered Cap | Shiny Mirror |
| Dr. Bob Bakker | Stegosaurus Guard | Sonic Whistle | Left Handed | Safari Fedora | Squeaky Toy |
| Agent Ava | Triceratops Mount | Rope Launcher | Left Handed | Leather Helmet | Shiny Mirror |
Clue 1
Multiplication facts (1-12)
The tracker counted the dino tracks packed in neat equal rows across the mud flat.
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
32
5
27
55
42
72
72
108
42
132
84
36
27
77
132
36
T
32
88
77
27
108
14
36
132
27
35
36
21
15
108
77
77
4 × 8 =T
7 × 11 =S
12 × 3 =O
8 × 11 =U
9 × 8 =L
6 × 7 =I
7 × 5 =C
5 × 11 =V
7 × 2 =B
12 × 11 =N
3 × 9 =E
9 × 12 =A
1 × 5 =H
3 × 5 =P
7 × 3 =M
12 × 7 =D
0/16 letters found
Clue 2
Rounding
The digital camp radar blurred the exact distance showing only a rounded scan of the trail.
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
400
900
90
20
300
40
40
200
300
4000
900
90
40
3000
T
400
900
90
80
200
8000
600
300
T
400
900
T
400
900
90
300
6000
40
90
500
T
400
900
200
4000
3000
Round 351 to the nearest hundredT
Round 87 to the nearest tenE
Round 5,796 to the nearest thousandR
Round 21 to the nearest tenV
Round 84 to the nearest tenM
Round 42 to the nearest tenL
Round 4,454 to the nearest thousandN
Round 500 to the nearest hundredF
Round 211 to the nearest hundredA
Round 7,679 to the nearest thousandP
Round 948 to the nearest hundredH
Round 265 to the nearest hundredI
Round 3,216 to the nearest thousandD
Round 591 to the nearest hundredW
0/14 letters found
Clue 3
Addition
The paleontology team added up all the scattered fossil fragments found near the camp gate.
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
724
385
979
320
942
648
648
432
942
281
475
432
710
648
757
463
979
708
432
475
432
763
265
763
432
919
463
757
942
T
724
763
T
724
463
979
432
T
724
487 + 237 =T
299 + 133 =A
302 + 640 =I
180 + 295 =W
266 + 444 =S
157 + 163 =V
164 + 299 =R
341 + 416 =U
331 + 648 =E
243 + 142 =H
119 + 162 =N
122 + 143 =B
215 + 433 =L
623 + 296 =F
489 + 274 =Y
342 + 366 =D
0/16 letters found
Clue 4
Subtraction
The guard subtracted the remaining water canteens from the original supply stack to see what was missing.
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
287
587
322
718
630
185
610
504
322
462
630
622
546
263
503
462
322
503
T
287
587
322
854
462
854
630
528
503
504
503
718
503
T
287
176
610
T
287
322
416 - 129 =T
660 - 156 =C
812 - 202 =I
1037 - 183 =R
796 - 250 =N
709 - 181 =M
189 - 13 =S
824 - 106 =P
810 - 180 =O
899 - 277 =U
654 - 332 =E
870 - 367 =A
564 - 102 =F
407 - 222 =L
716 - 129 =H
513 - 250 =D
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
The rangers shared the supply crates equally among their patrol teams before heading into the canyon.
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 ÷ 7 = ?
100 ÷ 10 = ?
72 ÷ 6 = ?
6 ÷ 1 = ?
24 ÷ 3 = ?
5 ÷ 5 = ?
9 ÷ 3 = ?
81 ÷ 9 = ?
55 ÷ 11 = ?
88 ÷ 8 = ?
22 ÷ 11 = ?
Step 2 — cross out the sentence with each answer
1.The villain whistled for a raptor companion, then dug with a gravel shovel.
2.The villain signaled a stegosaurus guard, then checked an amber scanner.
3.The villain signaled a stegosaurus guard, then blew a sonic whistle.
4.The villain signaled a stegosaurus guard, then fired a rope launcher.
5.The villain signaled a stegosaurus guard, then dug with a gravel shovel.
6.The villain rode on a triceratops mount, then fired a rope launcher.
7.The villain whistled for a raptor companion, then fired a rope launcher.
8.The villain whistled for a raptor companion, then checked an amber scanner.
9.The villain guided an ankylo helper, then dug with a gravel shovel.
10.The villain guided an ankylo helper, then checked an amber scanner.
11.The villain launched a pterodactyl scout, then blew a sonic whistle.
12.The villain guided an ankylo helper, then fired a rope launcher.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Secret of Dino Ridge
Culprit: Dr. Mary Anning (Raptor Companion · Rope Launcher · Left Handed · Feathered Cap · Fruity Treat)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT USE A BONE COMPASS"4 × 8 = 32 (T) · 7 × 11 = 77 (S) · 12 × 3 = 36 (O) · 8 × 11 = 88 (U) · 9 × 8 = 72 (L) · 6 × 7 = 42 (I) · 7 × 5 = 35 (C) · 5 × 11 = 55 (V) · 7 × 2 = 14 (B) · 12 × 11 = 132 (N) · 3 × 9 = 27 (E) · 9 × 12 = 108 (A) · 1 × 5 = 5 (H) · 3 × 5 = 15 (P) · 7 × 3 = 21 (M) · 12 × 7 = 84 (D)
- Clue 2 (Rounding): "THE VILLAIN HELD THE MAP WITH THEIR LEFT HAND"Round 351 to the nearest hundred = 400 (T) · Round 87 to the nearest ten = 90 (E) · Round 5,796 to the nearest thousand = 6000 (R) · Round 21 to the nearest ten = 20 (V) · Round 84 to the nearest ten = 80 (M) · Round 42 to the nearest ten = 40 (L) · Round 4,454 to the nearest thousand = 4000 (N) · Round 500 to the nearest hundred = 500 (F) · Round 211 to the nearest hundred = 200 (A) · Round 7,679 to the nearest thousand = 8000 (P) · Round 948 to the nearest hundred = 900 (H) · Round 265 to the nearest hundred = 300 (I) · Round 3,216 to the nearest thousand = 3000 (D) · Round 591 to the nearest hundred = 600 (W)
- Clue 3 (Addition): "THE VILLAIN WAS LURED AWAY BY A FRUITY TREAT"487 + 237 = 724 (T) · 299 + 133 = 432 (A) · 302 + 640 = 942 (I) · 180 + 295 = 475 (W) · 266 + 444 = 710 (S) · 157 + 163 = 320 (V) · 164 + 299 = 463 (R) · 341 + 416 = 757 (U) · 331 + 648 = 979 (E) · 243 + 142 = 385 (H) · 119 + 162 = 281 (N) · 122 + 143 = 265 (B) · 215 + 433 = 648 (L) · 623 + 296 = 919 (F) · 489 + 274 = 763 (Y) · 342 + 366 = 708 (D)
- Clue 4 (Subtraction): "THE POLICE FOUND A FEATHER FROM A CAP AT SITE"416 - 129 = 287 (T) · 660 - 156 = 504 (C) · 812 - 202 = 610 (I) · 1037 - 183 = 854 (R) · 796 - 250 = 546 (N) · 709 - 181 = 528 (M) · 189 - 13 = 176 (S) · 824 - 106 = 718 (P) · 810 - 180 = 630 (O) · 899 - 277 = 622 (U) · 654 - 332 = 322 (E) · 870 - 367 = 503 (A) · 564 - 102 = 462 (F) · 407 - 222 = 185 (L) · 716 - 129 = 587 (H) · 513 - 250 = 263 (D)
- Clue 5 (Division facts (1-12)): surviving statement (box 7) → Dr. Mary Anning28 ÷ 7 = 4 · 100 ÷ 10 = 10 · 72 ÷ 6 = 12 · 6 ÷ 1 = 6 · 24 ÷ 3 = 8 · 5 ÷ 5 = 1 · 9 ÷ 3 = 3 · 81 ÷ 9 = 9 · 55 ÷ 11 = 5 · 88 ÷ 8 = 11 · 22 ÷ 11 = 2
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Multiplication, Rounding, Addition, Subtraction, Division
- Reading level
- grades 3-4
- Theme
- The Secret of Dino Ridge — set in Dino Ridge Research Outpost
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects