🦕 DinosaursGrade 2Reading: grades 1-2AdditionSubtractionSkip countingMultiplicationMissing addends
The Great Fossil Mystery
Someone hid the golden T-Rex tooth at Camp Dino Dig! The Head Paleontologist needs your help to catch the dino prankster before lunch. Solve the clues 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 Mask | Dig Tool | Dominant Hand | Cap Color | Dropped Snack |
|---|---|---|---|---|---|
| Patricia Vickers | Stego Shield | Rock Hammer | Left Handed | Red Cap | Trail Mix |
| Cathy Forster | TRex Mask | Magnifier | Right Handed | Blue Cap | Trail Mix |
| Luis Chiappe | Raptor Suit | Magnifier | Right Handed | Red Cap | Cheese Sticks |
| Dong Zhiming | Stego Shield | Fossil Brush | Right Handed | Red Cap | Cheese Sticks |
| Bob Bakker | Raptor Suit | Rock Hammer | Left Handed | Red Cap | Apple Slices |
| David Weishampel | Trike Cloak | Tape Measure | Right Handed | Red Cap | Cheese Sticks |
| Barnum Brown | Ptero Wings | Magnifier | Left Handed | Blue Cap | Trail Mix |
| Roy Chapman | TRex Mask | Fossil Brush | Left Handed | Blue Cap | Trail Mix |
| Rodolfo Coria | Trike Cloak | Rock Hammer | Left Handed | Red Cap | Cheese Sticks |
| Mary Anning | TRex Mask | Magnifier | Right Handed | Red Cap | Cheese Sticks |
| Jack Horner | Raptor Suit | Magnifier | Right Handed | Blue Cap | Apple Slices |
| Sue Hendrickson | Ptero Wings | Plaster Kit | Right Handed | Green Cap | Cheese Sticks |
| Lindsay Zanno | Trike Cloak | Fossil Brush | Left Handed | Blue Cap | Trail Mix |
| Diego Pol | Raptor Suit | Plaster Kit | Right Handed | Blue Cap | Apple Slices |
| Steve Brusatte | Trike Cloak | Plaster Kit | Left Handed | Green Cap | Apple Slices |
| Kristina Curry | TRex Mask | Magnifier | Right Handed | Red Cap | Trail Mix |
| Jingmai OConnor | Trike Cloak | Magnifier | Left Handed | Green Cap | Apple Slices |
| Paul Barrett | Raptor Suit | Plaster Kit | Right Handed | Red Cap | Apple Slices |
| Xu Xing | Ptero Wings | Tape Measure | Right Handed | Red Cap | Cheese Sticks |
| Karen Chin | Stego Shield | Tape Measure | Left Handed | Red Cap | Trail Mix |
| Phil Currie | Stego Shield | Rock Hammer | Right Handed | Red Cap | Cheese Sticks |
Clue 1
Addition
Dr. Bone adds up all the dino footprints in the mud to find a 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
68
98
28
56
77
25
25
55
77
37
59
58
28
79
37
58
T
68
89
79
28
55
34
55
92
37
77
51
77
28
44
24 + 44 =T
18 + 7 =L
17 + 20 =N
23 + 21 =R
17 + 42 =D
49 + 40 =U
65 + 27 =G
25 + 26 =F
35 + 20 =A
50 + 29 =S
49 + 49 =H
32 + 26 =O
16 + 12 =E
46 + 31 =I
21 + 35 =V
13 + 21 =M
0/16 letters found
Clue 2
Subtraction
The dig crew subtracts broken tools from the supply bin to uncover a note.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
F
18
78
78
61
39
11
59
14
61
56
39
11
78
34
49
69
11
59
44
19
61
19
69
14
46
49
46
56
22
56
39
49
76
61
42 - 24 =F
59 - 37 =U
81 - 22 =I
57 - 11 =D
58 - 19 =P
107 - 38 =A
26 - 15 =R
70 - 26 =G
45 - 26 =H
22 - 8 =N
101 - 23 =O
38 - 4 =V
77 - 21 =S
50 - 1 =E
72 - 11 =T
91 - 15 =C
0/16 letters found
Clue 3
Skip counting
The ranger skip counts dino teeth along the sandy 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
55
90
80
14
40
50
10
33
8
T
55
80
40
15
40
60
14
14
80
15
50
36
90
80
80
8
80
8
T
55
35
36
33
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65T
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18P
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39K
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60A
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70O
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42C
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45I
0/13 letters found
Clue 4
Multiplication facts (1-12)
The camp leader counts crates of fossil rocks set out in equal rows.
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
96
8
45
54
45
T
96
45
36
T
96
4
35
45
100
121
25
70
54
15
11
45
54
36
15
14
15
T
96
T
96
8
45
55
36
45
70
45
12 × 8 =T
7 × 5 =V
11 × 11 =O
10 × 7 =N
1 × 8 =H
4 × 9 =C
5 × 5 =U
11 × 5 =S
4 × 1 =I
6 × 9 =D
10 × 10 =F
11 × 1 =R
5 × 9 =E
3 × 5 =A
2 × 7 =P
0/15 letters found
Clue 5
Missing addends — the last clue
The team finds missing bone counts to unlock the final message.
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
7 + ___ = 15
1 + ___ = 12
1 + ___ = 13
6 + ___ = 10
5 + ___ = 6
7 + ___ = 13
8 + ___ = 10
2 + ___ = 11
10 + ___ = 13
5 + ___ = 15
10 + ___ = 17
Step 2 — cross out the sentence with each answer
1.The villain wore the raptor suit, then measured bones with a tape measure.
2.The villain wrapped up in the trike cloak, then mixed up a plaster kit.
3.The villain wrapped up in the trike cloak, then tapped rocks with a rock hammer.
4.The villain wrapped up in the trike cloak, then looked close with a magnifier.
5.The villain carried the stego shield, then swept dust with a fossil brush.
6.The villain wore the rex mask, then mixed up a plaster kit.
7.The villain wore the raptor suit, then looked close with a magnifier.
8.The villain flew in with the ptero wings, then measured bones with a tape measure.
9.The villain flew in with the ptero wings, then mixed up a plaster kit.
10.The villain wore the rex mask, then looked close with a magnifier.
11.The villain carried the stego shield, then tapped rocks with a rock hammer.
12.The villain wrapped up in the trike cloak, then measured bones with a tape measure.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Fossil Mystery
Culprit: Dong Zhiming (Stego Shield · Fossil Brush · Right Handed · Red Cap · Cheese Sticks)
- Clue 1 (Addition): "THE VILLAIN DOES NOT USE A MAGNIFIER"24 + 44 = 68 (T) · 18 + 7 = 25 (L) · 17 + 20 = 37 (N) · 23 + 21 = 44 (R) · 17 + 42 = 59 (D) · 49 + 40 = 89 (U) · 65 + 27 = 92 (G) · 25 + 26 = 51 (F) · 35 + 20 = 55 (A) · 50 + 29 = 79 (S) · 49 + 49 = 98 (H) · 32 + 26 = 58 (O) · 16 + 12 = 28 (E) · 46 + 31 = 77 (I) · 21 + 35 = 56 (V) · 13 + 21 = 34 (M)
- Clue 2 (Subtraction): "FOOTPRINTS PROVE A RIGHT HANDED SUSPECT"42 - 24 = 18 (F) · 59 - 37 = 22 (U) · 81 - 22 = 59 (I) · 57 - 11 = 46 (D) · 58 - 19 = 39 (P) · 107 - 38 = 69 (A) · 26 - 15 = 11 (R) · 70 - 26 = 44 (G) · 45 - 26 = 19 (H) · 22 - 8 = 14 (N) · 101 - 23 = 78 (O) · 38 - 4 = 34 (V) · 77 - 21 = 56 (S) · 50 - 1 = 49 (E) · 72 - 11 = 61 (T) · 91 - 15 = 76 (C)
- Clue 3 (Skip counting): "THE PRANKSTER DROPPED A CHEESE STICK"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (P) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (K) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (A) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (O) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (C) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (I)
- Clue 4 (Multiplication facts (1-12)): "THE DETECTIVE FOUND A RED CAP AT THE SCENE"12 × 8 = 96 (T) · 7 × 5 = 35 (V) · 11 × 11 = 121 (O) · 10 × 7 = 70 (N) · 1 × 8 = 8 (H) · 4 × 9 = 36 (C) · 5 × 5 = 25 (U) · 11 × 5 = 55 (S) · 4 × 1 = 4 (I) · 6 × 9 = 54 (D) · 10 × 10 = 100 (F) · 11 × 1 = 11 (R) · 5 × 9 = 45 (E) · 3 × 5 = 15 (A) · 2 × 7 = 14 (P)
- Clue 5 (Missing addends): surviving statement (box 5) → Dong Zhiming7 + ___ = 15 = 8 · 1 + ___ = 12 = 11 · 1 + ___ = 13 = 12 · 6 + ___ = 10 = 4 · 5 + ___ = 6 = 1 · 7 + ___ = 13 = 6 · 8 + ___ = 10 = 2 · 2 + ___ = 11 = 9 · 10 + ___ = 13 = 3 · 5 + ___ = 15 = 10 · 10 + ___ = 17 = 7
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Subtraction, Skip counting, Multiplication, Missing addends
- Reading level
- grades 1-2
- Theme
- The Great Fossil Mystery — set in Camp Dino Dig
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects