🦕 Dinosaurs using 2 by 1 digitGrade 5Reading: grades 5-6MultiplicationAdditionPlace valueFractions of a numberDivision
The Dino Ridge Amber Mystery
A rare glowing amber specimen has vanished from the Dino Ridge Vault! The thief left behind footprints and high-tech trail markers across the fossil site. Help Dr. Aris analyze the clue data to catch the culprit.
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 | Primary Dig Tool | Field Gadget | Dominant Hand | Hairstyle | Defensive Counter |
|---|---|---|---|---|---|
| Gideon Mantell | Laser Chisels | Dino Nets | Right-Handed | Braided Hair | Bright Strobe Lights |
| Jim Jensen | Sonar Radar | Dino Nets | Left-Handed | Braided Hair | Ultrasound Screeches |
| Othniel Marsh | Fossil Scanner | Sound Baffles | Right-Handed | Spiky Hair | Citrus Sprays |
| Paul Sereno | Thermal Goggles | Sound Baffles | Right-Handed | Braided Hair | Ultrasound Screeches |
| Rodolfo Coria | Laser Chisels | Sound Baffles | Left-Handed | Spiky Hair | Bright Strobe Lights |
| Jack Horner | Thermal Goggles | Pneumatic Picks | Left-Handed | Braided Hair | Bright Strobe Lights |
| Dong Zhiming | Fossil Scanner | Pneumatic Picks | Right-Handed | Braided Hair | Bright Strobe Lights |
| Nizar Ibrahim | Grapple Launcher | Drone Decoys | Left-Handed | Spiky Hair | Bright Strobe Lights |
| Kristina Curry | Sonar Radar | Amber Traps | Right-Handed | Spiky Hair | Bright Strobe Lights |
| John Ostrom | Sonar Radar | Dino Nets | Left-Handed | Curly Hair | Ultrasound Screeches |
| Kenneth Carpenter | Thermal Goggles | Dino Nets | Right-Handed | Spiky Hair | Bright Strobe Lights |
| Karen Chin | Thermal Goggles | Drone Decoys | Right-Handed | Spiky Hair | Citrus Sprays |
| Diego Pol | Laser Chisels | Amber Traps | Left-Handed | Spiky Hair | Bright Strobe Lights |
| Phil Currie | Thermal Goggles | Drone Decoys | Left-Handed | Braided Hair | Ultrasound Screeches |
| Xu Xing | Laser Chisels | Dino Nets | Right-Handed | Spiky Hair | Citrus Sprays |
| Luis Chiappe | Laser Chisels | Pneumatic Picks | Right-Handed | Curly Hair | Citrus Sprays |
| Barnum Brown | Grapple Launcher | Sound Baffles | Left-Handed | Spiky Hair | Bright Strobe Lights |
| Mary Anning | Grapple Launcher | Amber Traps | Right-Handed | Spiky Hair | Citrus Sprays |
| Edward Cope | Grapple Launcher | Dino Nets | Left-Handed | Spiky Hair | Ultrasound Screeches |
| Roy Chapman Andrews | Laser Chisels | Dino Nets | Left-Handed | Braided Hair | Ultrasound Screeches |
| Bob Bakker | Sonar Radar | Amber Traps | Left-Handed | Spiky Hair | Bright Strobe Lights |
Clue 1
Multiplication facts (1-12)
At the Fossil Basin excavation camp, crates of dig supplies were stacked into equal rows to compute totals.
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
72
84
27
5
42
2
2
35
42
64
15
16
27
45
64
16
T
72
48
45
27
15
44
16
64
27
15
27
99
16
36
45
12 × 6 =T
2 × 8 =O
9 × 4 =Y
1 × 2 =L
5 × 1 =V
9 × 5 =S
8 × 6 =U
12 × 7 =H
3 × 5 =D
9 × 11 =C
8 × 8 =N
5 × 7 =A
11 × 4 =R
9 × 3 =E
7 × 6 =I
0/15 letters found
Clue 2
Addition
Our lead scout calculated the combined weight of newly unearthed bones to update the expedition cargo log.
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
3843
9643
8983
3479
9518
5077
5279
T
3843
8983
6772
9088
5994
9518
3479
3479
9151
5279
T
3843
T
3843
8983
5373
6772
3479
8005
8628
4153
7582
8983
5281
T
3843
9643
9518
8628
5373
1607 + 2236 =T
5942 + 2686 =N
3474 + 2520 =W
3095 + 6423 =A
2949 + 2424 =D
4079 + 5009 =R
2762 + 4010 =U
1802 + 2351 =G
2572 + 2709 =F
2266 + 1213 =S
3157 + 1920 =B
6140 + 3011 =P
3361 + 1918 =O
5164 + 3819 =E
3011 + 6632 =H
3013 + 4992 =I
2419 + 5163 =L
0/17 letters found
Clue 3
Place value
The central lab vault security grid displayed numeric power values requiring digit comparison.
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
6000
200
50
600
7000
80
80
100
7000
60
30
100
900
5000
50
40
50
80
80
50
70
400
1000
400
5000
7000
2000
200
T
6000
900
T
6000
5000
8000
400
50
900
What is the value of the 6 in 186,819?T
What is the value of the 7 in 157,148?I
What is the value of the 5 in 63,352?E
What is the value of the 3 in 61,036?W
What is the value of the 6 in 514,629?V
What is the value of the 1 in 91,374?Y
What is the value of the 9 in 673,921?S
What is the value of the 2 in 892,386?G
What is the value of the 8 in 740,484?L
What is the value of the 5 in 415,636?R
What is the value of the 4 in 536,457?B
What is the value of the 6 in 480,469?N
What is the value of the 1 in 59,155?A
What is the value of the 4 in 10,249?P
What is the value of the 7 in 10,670?D
What is the value of the 8 in 978,530?O
What is the value of the 2 in 65,251?H
0/17 letters found
Clue 4
Fractions of a number
A portion of the fossil site map was restored after clearing away ancient sediment layers.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
E
27
16
32
40
E
27
15
20
E
27
37
28
35
20
E
27
15
E
27
35
30
6
24
35
35
3
32
34
29
30
37
32
2
35
28
2
37
15
40
35
3/5 of 45 =E
2/6 of 87 =Y
5/10 of 80 =D
1/4 of 12 =P
6/8 of 8 =O
1/4 of 96 =W
1/6 of 96 =V
4/8 of 74 =A
1/4 of 80 =C
4/10 of 5 =R
4/10 of 70 =T
2/4 of 60 =H
6/10 of 25 =N
1/3 of 102 =K
2/3 of 48 =I
2/10 of 175 =S
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
The field supervisor split the daily supply rations equally among the research teams working in 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
40 ÷ 5 = ?
110 ÷ 11 = ?
48 ÷ 8 = ?
12 ÷ 4 = ?
81 ÷ 9 = ?
40 ÷ 10 = ?
20 ÷ 4 = ?
84 ÷ 12 = ?
20 ÷ 10 = ?
99 ÷ 9 = ?
144 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain cut through solid rock with laser chisels, then muffled heavy footsteps with sound baffles.
2.The villain scaled the cliff face with a grapple launcher, then secured giant specimens with dino nets.
3.The villain scanned the Jurassic canyon with sonar radar, then secured giant specimens with dino nets.
4.The villain analyzed hidden strata with a fossil scanner, then confused guard teams with drone decoys.
5.The villain scaled the cliff face with a grapple launcher, then trapped pursuing raptors with amber traps.
6.The villain cut through solid rock with laser chisels, then trapped pursuing raptors with amber traps.
7.The villain tracked nocturnal dinosaurs with thermal goggles, then secured giant specimens with dino nets.
8.The villain scanned the Jurassic canyon with sonar radar, then trapped pursuing raptors with amber traps.
9.The villain analyzed hidden strata with a fossil scanner, then trapped pursuing raptors with amber traps.
10.The villain scaled the cliff face with a grapple launcher, then muffled heavy footsteps with sound baffles.
11.The villain cut through solid rock with laser chisels, then confused guard teams with drone decoys.
12.The villain analyzed hidden strata with a fossil scanner, then secured giant specimens with dino nets.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Dino Ridge Amber Mystery
Culprit: Rodolfo Coria (Laser Chisels · Sound Baffles · Left-Handed · Spiky Hair · Bright Strobe Lights)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT USE DRONE DECOYS"12 × 6 = 72 (T) · 2 × 8 = 16 (O) · 9 × 4 = 36 (Y) · 1 × 2 = 2 (L) · 5 × 1 = 5 (V) · 9 × 5 = 45 (S) · 8 × 6 = 48 (U) · 12 × 7 = 84 (H) · 3 × 5 = 15 (D) · 9 × 11 = 99 (C) · 8 × 8 = 64 (N) · 5 × 7 = 35 (A) · 11 × 4 = 44 (R) · 9 × 3 = 27 (E) · 7 × 6 = 42 (I)
- Clue 2 (Addition): "THE SABOTEUR WAS SPOTTED USING LEFT HAND"1607 + 2236 = 3843 (T) · 5942 + 2686 = 8628 (N) · 3474 + 2520 = 5994 (W) · 3095 + 6423 = 9518 (A) · 2949 + 2424 = 5373 (D) · 4079 + 5009 = 9088 (R) · 2762 + 4010 = 6772 (U) · 1802 + 2351 = 4153 (G) · 2572 + 2709 = 5281 (F) · 2266 + 1213 = 3479 (S) · 3157 + 1920 = 5077 (B) · 6140 + 3011 = 9151 (P) · 3361 + 1918 = 5279 (O) · 5164 + 3819 = 8983 (E) · 3011 + 6632 = 9643 (H) · 3013 + 4992 = 8005 (I) · 2419 + 5163 = 7582 (L)
- Clue 3 (Place value): "THE VILLAIN WAS REPELLED BY BRIGHT STROBES"What is the value of the 6 in 186,819? = 6000 (T) · What is the value of the 7 in 157,148? = 7000 (I) · What is the value of the 5 in 63,352? = 50 (E) · What is the value of the 3 in 61,036? = 30 (W) · What is the value of the 6 in 514,629? = 600 (V) · What is the value of the 1 in 91,374? = 1000 (Y) · What is the value of the 9 in 673,921? = 900 (S) · What is the value of the 2 in 892,386? = 2000 (G) · What is the value of the 8 in 740,484? = 80 (L) · What is the value of the 5 in 415,636? = 5000 (R) · What is the value of the 4 in 536,457? = 400 (B) · What is the value of the 6 in 480,469? = 60 (N) · What is the value of the 1 in 59,155? = 100 (A) · What is the value of the 4 in 10,249? = 40 (P) · What is the value of the 7 in 10,670? = 70 (D) · What is the value of the 8 in 978,530? = 8000 (O) · What is the value of the 2 in 65,251? = 200 (H)
- Clue 4 (Fractions of a number): "EVIDENCE AT SCENE SHOWS SPIKY HAIR STRANDS"3/5 of 45 = 27 (E) · 2/6 of 87 = 29 (Y) · 5/10 of 80 = 40 (D) · 1/4 of 12 = 3 (P) · 6/8 of 8 = 6 (O) · 1/4 of 96 = 24 (W) · 1/6 of 96 = 16 (V) · 4/8 of 74 = 37 (A) · 1/4 of 80 = 20 (C) · 4/10 of 5 = 2 (R) · 4/10 of 70 = 28 (T) · 2/4 of 60 = 30 (H) · 6/10 of 25 = 15 (N) · 1/3 of 102 = 34 (K) · 2/3 of 48 = 32 (I) · 2/10 of 175 = 35 (S)
- Clue 5 (Division facts (1-12)): surviving statement (box 1) → Rodolfo Coria40 ÷ 5 = 8 · 110 ÷ 11 = 10 · 48 ÷ 8 = 6 · 12 ÷ 4 = 3 · 81 ÷ 9 = 9 · 40 ÷ 10 = 4 · 20 ÷ 4 = 5 · 84 ÷ 12 = 7 · 20 ÷ 10 = 2 · 99 ÷ 9 = 11 · 144 ÷ 12 = 12
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Multiplication, Addition, Place value, Fractions of a number, Division
- Reading level
- grades 5-6
- Theme
- The Dino Ridge Amber Mystery — set in Dino Ridge Fossil Reserve
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects