🦕 DinosaursGrade 1Reading: grades 1-2AdditionSubtractionMultiplicationSkip countingDivision
The Great Dino Fossil Mystery
A rare glowing fossil went missing from Dino Valley Park! Help Ranger Sam track down the sneaky thief before the big museum tour begins.
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 Gear | Dino Badge | Watch Wrist | Hat Color | Favorite Snack |
|---|---|---|---|---|---|
| Tracker Tim | Track Finder | Silver Leaf | Right Wrist | Green Cap | Fern Crisps |
| Dr Bone | Safety Net | Silver Leaf | Left Wrist | Green Cap | Fern Crisps |
| Ranger Sam | Lava Lamp | Gold Spike | Right Wrist | Brown Cap | Fern Crisps |
| Scientist Sara | Track Finder | Ruby Shell | Left Wrist | Green Cap | Fern Crisps |
| Explorer Maya | Bone Scanner | Bronze Claw | Right Wrist | Red Cap | Nut Bars |
| Ranger Ron | Track Finder | Bronze Claw | Left Wrist | Green Cap | Fern Crisps |
| Professor Fern | Safety Net | Gold Spike | Left Wrist | Green Cap | Berry Bites |
| Digging Dan | Track Finder | Gold Spike | Left Wrist | Red Cap | Nut Bars |
| Trapper Tess | Lava Lamp | Amber Gem | Left Wrist | Red Cap | Nut Bars |
| Camper Cody | Rope Lasso | Gold Spike | Left Wrist | Brown Cap | Nut Bars |
| Camper Chloe | Rope Lasso | Amber Gem | Left Wrist | Green Cap | Nut Bars |
| Scout Zoe | Lava Lamp | Gold Spike | Left Wrist | Green Cap | Fern Crisps |
| Hunter Hannah | Lava Lamp | Amber Gem | Right Wrist | Green Cap | Berry Bites |
| Scientist Skye | Track Finder | Silver Leaf | Left Wrist | Green Cap | Nut Bars |
| Guide Gabe | Bone Scanner | Amber Gem | Left Wrist | Red Cap | Fern Crisps |
| Dino Daisy | Lava Lamp | Amber Gem | Right Wrist | Green Cap | Nut Bars |
| Professor Pam | Rope Lasso | Gold Spike | Right Wrist | Green Cap | Berry Bites |
| Ranger Rex | Track Finder | Gold Spike | Right Wrist | Red Cap | Nut Bars |
| Scout Ben | Bone Scanner | Silver Leaf | Left Wrist | Green Cap | Fern Crisps |
| Tracker Leo | Safety Net | Silver Leaf | Right Wrist | Brown Cap | Fern Crisps |
| Digger Dave | Rope Lasso | Silver Leaf | Left Wrist | Red Cap | Fern Crisps |
Clue 1
Addition
Ranger Sam found dino footprint molds in two tents. Add them together to unlock the first hint.
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
15
13
17
9
2
14
14
7
2
3
10
5
17
16
3
5
T
15
13
7
9
17
7
8
5
14
10
16
18
2
4
17
4 + 11 =T
3 + 6 =V
2 + 5 =A
6 + 2 =G
7 + 7 =L
5 + 11 =S
1 + 4 =O
4 + 9 =H
1 + 2 =N
4 + 6 =D
2 + 2 =K
1 + 1 =I
9 + 9 =P
11 + 6 =E
0/14 letters found
Clue 2
Subtraction
Tracker Leo counted fossil brushes but some went missing. Subtract to find the watch 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
8
13
5
17
9
T
8
18
5
19
19
19
14
17
14
17
14
T
8
12
13
7
18
T
8
13
5
10
5
2
T
8
17
6
9
19
T
8
14 - 6 =T
15 - 8 =O
9 - 3 =R
14 - 1 =H
20 - 2 =N
14 - 2 =C
20 - 1 =S
8 - 6 =F
18 - 4 =A
12 - 7 =E
19 - 2 =W
15 - 6 =I
16 - 6 =L
0/13 letters found
Clue 3
Multiplication facts (1-12)
Professor Fern saw boxes of shiny amber stones in equal rows. Multiply to open the path.
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
21
18
1
36
66
132
132
90
66
120
10
50
40
81
81
1
10
90
12
90
11
40
144
144
1
50
120
60
50
66
45
81
45
3 × 7 =T
3 × 6 =H
12 × 5 =C
12 × 12 =F
10 × 1 =D
6 × 11 =I
9 × 4 =V
1 × 1 =E
12 × 10 =N
9 × 10 =A
9 × 9 =P
11 × 12 =L
6 × 2 =B
9 × 5 =S
10 × 4 =O
5 × 10 =R
1 × 11 =G
0/17 letters found
Clue 4
Skip counting
Dino Daisy tracked footprints going by twos up the hill. Skip count to trace the suspect.
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
10
36
8
18
18
28
100
A
10
24
120
A
10
15
25
45
55
28
27
A
10
12
12
35
18
27
42
36
15
42
12
18
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30P
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32N
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12R
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45H
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140W
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120C
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65U
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
Explorer Maya divided dino snacks equally among the campers. Divide to solve 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
35 ÷ 5 = ?
66 ÷ 11 = ?
12 ÷ 12 = ?
45 ÷ 5 = ?
96 ÷ 12 = ?
12 ÷ 6 = ?
55 ÷ 11 = ?
48 ÷ 4 = ?
44 ÷ 4 = ?
9 ÷ 3 = ?
28 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain cast a safety net, then pinned on a silver leaf.
2.The villain threw a rope lasso, then pinned on a silver leaf.
3.The villain ran a bone scanner, then pinned on a bronze claw.
4.The villain used a lava lamp, then pinned on a ruby shell.
5.The villain threw a rope lasso, then pinned on a bronze claw.
6.The villain followed a track finder, then pinned on a ruby shell.
7.The villain followed a track finder, then pinned on a bronze claw.
8.The villain threw a rope lasso, then pinned on a amber gem.
9.The villain used a lava lamp, then pinned on a gold spike.
10.The villain ran a bone scanner, then pinned on a silver leaf.
11.The villain cast a safety net, then pinned on a ruby shell.
12.The villain ran a bone scanner, then pinned on a gold spike.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Dino Fossil Mystery
Culprit: Scout Ben (Bone Scanner · Silver Leaf · Left Wrist · Green Cap · Fern Crisps)
- Clue 1 (Addition): "THE VILLAIN DOES NOT HAVE A GOLD SPIKE"4 + 11 = 15 (T) · 3 + 6 = 9 (V) · 2 + 5 = 7 (A) · 6 + 2 = 8 (G) · 7 + 7 = 14 (L) · 5 + 11 = 16 (S) · 1 + 4 = 5 (O) · 4 + 9 = 13 (H) · 1 + 2 = 3 (N) · 4 + 6 = 10 (D) · 2 + 2 = 4 (K) · 1 + 1 = 2 (I) · 9 + 9 = 18 (P) · 11 + 6 = 17 (E)
- Clue 2 (Subtraction): "THE WITNESS SAW A WATCH ON THE LEFT WRIST"14 - 6 = 8 (T) · 15 - 8 = 7 (O) · 9 - 3 = 6 (R) · 14 - 1 = 13 (H) · 20 - 2 = 18 (N) · 14 - 2 = 12 (C) · 20 - 1 = 19 (S) · 8 - 6 = 2 (F) · 18 - 4 = 14 (A) · 12 - 7 = 5 (E) · 19 - 2 = 17 (W) · 15 - 6 = 9 (I) · 16 - 6 = 10 (L)
- Clue 3 (Multiplication facts (1-12)): "THE VILLAIN DROPPED A BAG OF FERN CRISPS"3 × 7 = 21 (T) · 3 × 6 = 18 (H) · 12 × 5 = 60 (C) · 12 × 12 = 144 (F) · 10 × 1 = 10 (D) · 6 × 11 = 66 (I) · 9 × 4 = 36 (V) · 1 × 1 = 1 (E) · 12 × 10 = 120 (N) · 9 × 10 = 90 (A) · 9 × 9 = 81 (P) · 11 × 12 = 132 (L) · 6 × 2 = 12 (B) · 9 × 5 = 45 (S) · 10 × 4 = 40 (O) · 5 × 10 = 50 (R) · 1 × 11 = 11 (G)
- Clue 4 (Skip counting): "A GREEN CAP WAS FOUND AT THE DIG SITE"Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (P) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (R) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (H) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (W) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (C) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (U)
- Clue 5 (Division facts (1-12)): surviving statement (box 10) → Scout Ben35 ÷ 5 = 7 · 66 ÷ 11 = 6 · 12 ÷ 12 = 1 · 45 ÷ 5 = 9 · 96 ÷ 12 = 8 · 12 ÷ 6 = 2 · 55 ÷ 11 = 5 · 48 ÷ 4 = 12 · 44 ÷ 4 = 11 · 9 ÷ 3 = 3 · 28 ÷ 7 = 4
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Multiplication, Skip counting, Division
- Reading level
- grades 1-2
- Theme
- The Great Dino Fossil Mystery — set in Dino Valley Park
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects