🦕 DinosaursGrade 1Reading: grades 1-2AdditionSubtractionMultiplicationSkip countingDivision
The Mystery of the Missing T-Rex Tooth
A rare golden T-Rex tooth disappeared from the museum display! The park ranger needs your help to find which sneaky dino fan took 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 Gear | Fossil Badge | Footprint Style | Hat Color | Favorite Snack |
|---|---|---|---|---|---|
| Toby Track | Track Finder | Stegosaurus Badge | Left Boot Print | Brown Fedora | Berry Crisp |
| Leo Raptor | Digging Shovel | Stegosaurus Badge | Right Boot Print | Brown Fedora | Berry Crisp |
| Penny Pinch | Flashlight Pack | Stegosaurus Badge | Right Boot Print | Brown Fedora | Berry Crisp |
| Kira Mud | Fossil Scanner | Pterodactyl Badge | Right Boot Print | Green Cap | Berry Crisp |
| Pete Peat | Flashlight Pack | T-Rex Badge | Left Boot Print | Yellow Helmet | Dino Crunch |
| Opal Orton | Digging Shovel | Stegosaurus Badge | Right Boot Print | Yellow Helmet | Berry Crisp |
| Finn Flint | Flashlight Pack | Stegosaurus Badge | Right Boot Print | Yellow Helmet | Berry Crisp |
| Professor Bone | Fossil Scanner | Raptor Badge | Left Boot Print | Brown Fedora | Fern Chips |
| Jack Jasper | Flashlight Pack | Pterodactyl Badge | Right Boot Print | Green Cap | Dino Crunch |
| Barnum Brown | Dino Whistle | Raptor Badge | Right Boot Print | Brown Fedora | Fern Chips |
| Quinn Quartz | Track Finder | Triceratops Badge | Right Boot Print | Brown Fedora | Berry Crisp |
| Mona Mud | Fossil Scanner | T-Rex Badge | Right Boot Print | Yellow Helmet | Dino Crunch |
| Ella Amber | Flashlight Pack | T-Rex Badge | Right Boot Print | Brown Fedora | Berry Crisp |
| Maya Fossil | Dino Whistle | T-Rex Badge | Right Boot Print | Yellow Helmet | Fern Chips |
| Zack Zoom | Digging Shovel | T-Rex Badge | Left Boot Print | Brown Fedora | Dino Crunch |
| Iris Ivory | Flashlight Pack | Pterodactyl Badge | Right Boot Print | Brown Fedora | Berry Crisp |
| Noah Nodule | Dino Whistle | Stegosaurus Badge | Right Boot Print | Yellow Helmet | Fern Chips |
| Liam Leaf | Flashlight Pack | Stegosaurus Badge | Left Boot Print | Yellow Helmet | Dino Crunch |
| Dr Mary Anning | Flashlight Pack | Raptor Badge | Right Boot Print | Green Cap | Berry Crisp |
| Sammy Stone | Digging Shovel | Stegosaurus Badge | Left Boot Print | Green Cap | Fern Chips |
| Ranger Rick | Dino Whistle | Triceratops Badge | Left Boot Print | Yellow Helmet | Berry Crisp |
Clue 1
Addition
Ranger Rick counted the bone tools found near the museum door to open Clue 1.
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
19
5
20
3
5
9
13
11
12
8
6
6
9
8
3
19
9
20
3
18
T
15
10
5
7
16
9
4
17
5
8 + 7 =T
1 + 5 =L
5 + 2 =X
13 + 6 =H
12 + 4 =B
13 + 5 =O
3 + 1 =D
3 + 2 =E
5 + 7 =V
10 + 3 =K
3 + 5 =I
2 + 1 =N
7 + 3 =R
4 + 7 =Y
4 + 5 =A
6 + 11 =G
7 + 13 =S
0/17 letters found
Clue 2
Subtraction
Maya dropped some fossil brushes so we counted how many were left to unlock Clue 2.
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
5
17
19
3
7
13
5
1
2
13
12
7
17
17
4
14
16
11
5
T
15
10
1
1
T
15
4
14
16
8
T
15
19 - 4 =T
16 - 4 =A
18 - 2 =I
19 - 6 =S
9 - 6 =U
19 - 8 =G
7 - 6 =O
14 - 4 =B
9 - 5 =P
7 - 2 =H
15 - 1 =R
9 - 1 =N
20 - 1 =M
19 - 2 =E
6 - 4 =W
16 - 9 =D
0/16 letters found
Clue 3
Multiplication facts (1-12)
Professor Bone lined up dino eggs in equal rows to figure out Clue 3.
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
3
108
18
33
56
33
121
18
88
T
3
14
25
120
121
121
18
14
84
88
25
56
27
66
120
132
66
18
25
25
20
88
25
30
33
121
3 × 1 =T
3 × 9 =M
12 × 9 =H
10 × 12 =O
7 × 2 =D
11 × 6 =B
5 × 5 =R
7 × 12 =A
11 × 11 =P
2 × 10 =Y
2 × 9 =E
11 × 3 =S
6 × 5 =I
11 × 8 =C
7 × 8 =U
12 × 11 =F
0/16 letters found
Clue 4
Skip counting
Toby counted footsteps by twos along the dirt path to reveal Clue 4.
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
40
55
50
130
E
40
70
24
E
40
22
100
6
60
22
18
15
110
6
60
70
120
E
40
130
6
110
18
60
18
22
25
E
40
120
39
15
E
40
100
50
70
130
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50E
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140F
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65V
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21B
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24A
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30C
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80W
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26S
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
Dr Mary shared fossil maps equally among the team to decode Clue 5.
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 ÷ 6 = ?
108 ÷ 12 = ?
100 ÷ 10 = ?
16 ÷ 4 = ?
14 ÷ 7 = ?
3 ÷ 1 = ?
8 ÷ 8 = ?
88 ÷ 8 = ?
40 ÷ 5 = ?
7 ÷ 1 = ?
84 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain scanned the dig site, then pinned on a trex badge.
2.The villain scanned for old fossils, then pinned on a trex badge.
3.The villain scanned for old fossils, then pinned on a pterodactyl badge.
4.The villain scanned the dig site, then pinned on a raptor badge.
5.The villain tracked the heavy footprints, then pinned on a triceratops badge.
6.The villain lit up the dark cave, then pinned on a stegosaurus badge.
7.The villain blew the dino whistle, then pinned on a raptor badge.
8.The villain blew the dino whistle, then pinned on a triceratops badge.
9.The villain scanned the dig site, then pinned on a stegosaurus badge.
10.The villain lit up the dark cave, then pinned on a pterodactyl badge.
11.The villain lit up the dark cave, then pinned on a triceratops badge.
12.The villain blew the dino whistle, then pinned on a pterodactyl badge.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Missing T-Rex Tooth
Culprit: Quinn Quartz (Track Finder · Triceratops Badge · Right Boot Print · Brown Fedora · Berry Crisp)
- Clue 1 (Addition): "THE SNEAKY VILLAIN HAS NO TREX BADGE"8 + 7 = 15 (T) · 1 + 5 = 6 (L) · 5 + 2 = 7 (X) · 13 + 6 = 19 (H) · 12 + 4 = 16 (B) · 13 + 5 = 18 (O) · 3 + 1 = 4 (D) · 3 + 2 = 5 (E) · 5 + 7 = 12 (V) · 10 + 3 = 13 (K) · 3 + 5 = 8 (I) · 2 + 1 = 3 (N) · 7 + 3 = 10 (R) · 4 + 7 = 11 (Y) · 4 + 5 = 9 (A) · 6 + 11 = 17 (G) · 7 + 13 = 20 (S)
- Clue 2 (Subtraction): "THE MUD SHOWS A DEEP RIGHT BOOT PRINT"19 - 4 = 15 (T) · 16 - 4 = 12 (A) · 18 - 2 = 16 (I) · 19 - 6 = 13 (S) · 9 - 6 = 3 (U) · 19 - 8 = 11 (G) · 7 - 6 = 1 (O) · 14 - 4 = 10 (B) · 9 - 5 = 4 (P) · 7 - 2 = 5 (H) · 15 - 1 = 14 (R) · 9 - 1 = 8 (N) · 20 - 1 = 19 (M) · 19 - 2 = 17 (E) · 6 - 4 = 2 (W) · 16 - 9 = 7 (D)
- Clue 3 (Multiplication facts (1-12)): "THE SUSPECT DROPPED A CRUMB OF BERRY CRISP"3 × 1 = 3 (T) · 3 × 9 = 27 (M) · 12 × 9 = 108 (H) · 10 × 12 = 120 (O) · 7 × 2 = 14 (D) · 11 × 6 = 66 (B) · 5 × 5 = 25 (R) · 7 × 12 = 84 (A) · 11 × 11 = 121 (P) · 2 × 10 = 20 (Y) · 2 × 9 = 18 (E) · 11 × 3 = 33 (S) · 6 × 5 = 30 (I) · 11 × 8 = 88 (C) · 7 × 8 = 56 (U) · 12 × 11 = 132 (F)
- Clue 4 (Skip counting): "EVIDENCE SHOWS A BROWN FEDORA WAS LEFT BEHIND"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (F) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (V) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (B) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (H) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (A) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (C) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80 = 60 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (S)
- Clue 5 (Division facts (1-12)): surviving statement (box 5) → Quinn Quartz36 ÷ 6 = 6 · 108 ÷ 12 = 9 · 100 ÷ 10 = 10 · 16 ÷ 4 = 4 · 14 ÷ 7 = 2 · 3 ÷ 1 = 3 · 8 ÷ 8 = 1 · 88 ÷ 8 = 11 · 40 ÷ 5 = 8 · 7 ÷ 1 = 7 · 84 ÷ 7 = 12
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Multiplication, Skip counting, Division
- Reading level
- grades 1-2
- Theme
- The Mystery of the Missing T-Rex Tooth — set in Dino Valley Park
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects