🦕 DinosaursGrade 2Reading: grades 1-2AdditionSubtractionMultiplicationPlace valueMissing addends
The Great Dino Fossil Mystery
A rare glowing amber egg has gone missing from the Dino Discovery Museum! Work with the Fossil Patrol to gather clues, solve math puzzles, and unmask the thief.
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 Mask | Gadget | Stance | Feather Color | Favorite Snack |
|---|---|---|---|---|---|
| Maya Mastodon | Raptor Boots | Fossil Brush | Left-handed grip | Gold feathers | Crunchy Ferns |
| Bruno Brachio | Tricera Horns | Fossil Brush | Left-handed grip | Green feathers | Sweet Berries |
| Chloe Claw | Stego Shield | Lava Flashlight | Left-handed grip | Gold feathers | Crunchy Ferns |
| Ranger Rex | Ptero Wings | Lava Flashlight | Left-handed grip | Gold feathers | Crunchy Ferns |
| Sandy Stone | Stego Shield | Amber Compass | Left-handed grip | Green feathers | Salty Seeds |
| Leo Lithos | Tricera Horns | Amber Compass | Left-handed grip | Gold feathers | Crunchy Ferns |
| Bone Bob | Tricera Horns | Amber Compass | Left-handed grip | Red feathers | Sweet Berries |
| Digging Doug | Ptero Wings | Vine Rope | Right-handed grip | Green feathers | Salty Seeds |
| Raptor Ray | Tricera Horns | Lava Flashlight | Left-handed grip | Gold feathers | Sweet Berries |
| Tracker Tara | Rex Helmet | Fossil Brush | Left-handed grip | Green feathers | Crunchy Ferns |
| Penny Paleo | Stego Shield | Fossil Brush | Right-handed grip | Gold feathers | Crunchy Ferns |
| Scout Sam | Tricera Horns | Amber Compass | Left-handed grip | Green feathers | Salty Seeds |
| Pete Pterodactyl | Tricera Horns | Amber Compass | Left-handed grip | Gold feathers | Salty Seeds |
| Tina T Rex | Stego Shield | Fossil Brush | Left-handed grip | Red feathers | Sweet Berries |
| Iggy Iguanodon | Raptor Boots | Lava Flashlight | Right-handed grip | Green feathers | Sweet Berries |
| Dino Dan | Ptero Wings | Bone Scanner | Left-handed grip | Gold feathers | Crunchy Ferns |
| Valley Val | Stego Shield | Lava Flashlight | Left-handed grip | Gold feathers | Sweet Berries |
| Spino Steve | Stego Shield | Bone Scanner | Left-handed grip | Green feathers | Crunchy Ferns |
| Toby Tricera | Tricera Horns | Lava Flashlight | Right-handed grip | Red feathers | Sweet Berries |
| Cam Cave | Tricera Horns | Fossil Brush | Left-handed grip | Green feathers | Crunchy Ferns |
| Amber Arch | Ptero Wings | Bone Scanner | Left-handed grip | Gold feathers | Salty Seeds |
Clue 1
Addition
Ranger Rex found two piles of fossil bones in the dirt lab. Add the bones in both piles together to unlock the first 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
89
67
92
T
89
67
46
92
63
48
46
48
28
64
T
89
70
47
92
96
28
96
88
65
92
53
58
64
88
25
96
47
47
62 + 27 =T
37 + 55 =E
9 + 19 =N
24 + 43 =H
54 + 34 =M
24 + 22 =I
28 + 20 =D
36 + 29 =B
18 + 35 =R
21 + 49 =U
38 + 25 =F
58 + 38 =A
9 + 16 =P
31 + 16 =S
28 + 30 =C
39 + 25 =O
0/16 letters found
Clue 2
Subtraction
Tracker Tara counted fossil footprints in the mud, but some got washed away by river water. Subtract to find the footprint count.
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
69
34
41
26
18
56
56
23
45
75
49
23
14
T
69
56
56
34
18
13
12
45
41
26
T
69
34
12
14
78
41
78
72
49
23
75
99 - 30 =T
50 - 36 =N
117 - 39 =D
82 - 37 =L
75 - 3 =G
42 - 16 =F
42 - 24 =O
35 - 22 =W
57 - 23 =H
110 - 35 =P
24 - 12 =A
63 - 14 =R
83 - 27 =S
38 - 15 =I
46 - 5 =E
0/15 letters found
Clue 3
Multiplication facts (1-12)
The museum has dino eggs arranged in equal rows on display shelves. Multiply the rows to reveal what was left behind.
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
48
12
64
T
48
12
16
64
80
36
25
20
T
48
144
25
42
42
64
99
45
70
49
144
56
35
49
12
70
80
64
144
35
20
12 × 4 =T
12 × 3 =W
8 × 8 =E
5 × 5 =A
6 × 7 =P
7 × 7 =C
9 × 5 =B
4 × 5 =S
3 × 4 =H
10 × 8 =F
2 × 8 =I
10 × 7 =Y
9 × 11 =D
7 × 8 =U
12 × 12 =R
5 × 7 =N
0/16 letters found
Clue 4
Place value
A keycard reader at the cave gate shows digits for hundreds, tens, and ones. Check the place values to read the passcode.
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
61
83
74
T
61
78
53
23
29
74
78
56
58
81
76
49
53
67
58
63
49
56
74
53
T
61
83
74
78
53
T
61
T
61
83
74
50
23
74
76
74
What number has 6 tens and 1 one?T
What number has 7 tens and 8 ones?R
What number has 6 tens and 3 ones?L
What number has 8 tens and 3 ones?H
What number has 8 tens and 1 one?U
What number has 5 tens and 0 ones?S
What number has 4 tens and 9 ones?D
What number has 5 tens and 8 ones?O
What number has 2 tens and 9 ones?K
What number has 7 tens and 4 ones?E
What number has 6 tens and 7 ones?G
What number has 5 tens and 6 ones?F
What number has 7 tens and 6 ones?N
What number has 5 tens and 3 ones?A
What number has 2 tens and 3 ones?C
0/15 letters found
Clue 5
Missing addends — the last clue
Scout Sam needs to fill a crate with heavy rocks, but some are missing. Find the missing amount to finish the case.
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
1 + ___ = 8
6 + ___ = 11
5 + ___ = 15
6 + ___ = 9
1 + ___ = 10
9 + ___ = 20
3 + ___ = 4
2 + ___ = 10
3 + ___ = 7
6 + ___ = 8
7 + ___ = 13
Step 2 — cross out the sentence with each answer
1.The villain wore a rex helmet, then swung across the pit with a vine rope.
2.The villain strapped on tricera horns, then checked directions with an amber compass.
3.The villain strapped on tricera horns, then dusted off rocks with a fossil brush.
4.The villain wore a rex helmet, then dusted off rocks with a fossil brush.
5.The villain laced up raptor boots, then dusted off rocks with a fossil brush.
6.The villain laced up raptor boots, then checked directions with an amber compass.
7.The villain held a stego shield, then lit up the cave with a lava flashlight.
8.The villain held a stego shield, then dusted off rocks with a fossil brush.
9.The villain strapped on tricera horns, then scanned for clues with a bone scanner.
10.The villain spread ptero wings, then scanned for clues with a bone scanner.
11.The villain wore a rex helmet, then lit up the cave with a lava flashlight.
12.The villain spread ptero wings, then lit up the cave with a lava flashlight.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Dino Fossil Mystery
Culprit: Ranger Rex (Ptero Wings · Lava Flashlight · Left-handed grip · Gold feathers · Crunchy Ferns)
- Clue 1 (Addition): "THE THIEF DID NOT USE AN AMBER COMPASS"62 + 27 = 89 (T) · 37 + 55 = 92 (E) · 9 + 19 = 28 (N) · 24 + 43 = 67 (H) · 54 + 34 = 88 (M) · 24 + 22 = 46 (I) · 28 + 20 = 48 (D) · 36 + 29 = 65 (B) · 18 + 35 = 53 (R) · 21 + 49 = 70 (U) · 38 + 25 = 63 (F) · 58 + 38 = 96 (A) · 9 + 16 = 25 (P) · 31 + 16 = 47 (S) · 28 + 30 = 58 (C) · 39 + 25 = 64 (O)
- Clue 2 (Subtraction): "THE FOSSIL PRINTS SHOW A LEFT HANDED GRIP"99 - 30 = 69 (T) · 50 - 36 = 14 (N) · 117 - 39 = 78 (D) · 82 - 37 = 45 (L) · 75 - 3 = 72 (G) · 42 - 16 = 26 (F) · 42 - 24 = 18 (O) · 35 - 22 = 13 (W) · 57 - 23 = 34 (H) · 110 - 35 = 75 (P) · 24 - 12 = 12 (A) · 63 - 14 = 49 (R) · 83 - 27 = 56 (S) · 38 - 15 = 23 (I) · 46 - 5 = 41 (E)
- Clue 3 (Multiplication facts (1-12)): "THE THIEF WAS TRAPPED BY CRUNCHY FERNS"12 × 4 = 48 (T) · 12 × 3 = 36 (W) · 8 × 8 = 64 (E) · 5 × 5 = 25 (A) · 6 × 7 = 42 (P) · 7 × 7 = 49 (C) · 9 × 5 = 45 (B) · 4 × 5 = 20 (S) · 3 × 4 = 12 (H) · 10 × 8 = 80 (F) · 2 × 8 = 16 (I) · 10 × 7 = 70 (Y) · 9 × 11 = 99 (D) · 7 × 8 = 56 (U) · 12 × 12 = 144 (R) · 5 × 7 = 35 (N)
- Clue 4 (Place value): "THE TRACKER FOUND A GOLD FEATHER AT THE SCENE"What number has 6 tens and 1 one? = 61 (T) · What number has 7 tens and 8 ones? = 78 (R) · What number has 6 tens and 3 ones? = 63 (L) · What number has 8 tens and 3 ones? = 83 (H) · What number has 8 tens and 1 one? = 81 (U) · What number has 5 tens and 0 ones? = 50 (S) · What number has 4 tens and 9 ones? = 49 (D) · What number has 5 tens and 8 ones? = 58 (O) · What number has 2 tens and 9 ones? = 29 (K) · What number has 7 tens and 4 ones? = 74 (E) · What number has 6 tens and 7 ones? = 67 (G) · What number has 5 tens and 6 ones? = 56 (F) · What number has 7 tens and 6 ones? = 76 (N) · What number has 5 tens and 3 ones? = 53 (A) · What number has 2 tens and 3 ones? = 23 (C)
- Clue 5 (Missing addends): surviving statement (box 12) → Ranger Rex1 + ___ = 8 = 7 · 6 + ___ = 11 = 5 · 5 + ___ = 15 = 10 · 6 + ___ = 9 = 3 · 1 + ___ = 10 = 9 · 9 + ___ = 20 = 11 · 3 + ___ = 4 = 1 · 2 + ___ = 10 = 8 · 3 + ___ = 7 = 4 · 6 + ___ = 8 = 2 · 7 + ___ = 13 = 6
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Subtraction, Multiplication, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Great Dino Fossil Mystery — set in Dino Discovery Valley Museum
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects