🦕 DinosaursGrade 1Reading: grades 1-2AdditionSubtractionMultiplicationSkip countingDivision
The Great Dino Bone Mystery
Someone swiped the shiny gold T-Rex tooth from the paleontology tent! Track the footprints and decode the clues to catch 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 Suit | Fossil Gadget | Compass Strap | Expedition Hat | Distraction Toy |
|---|---|---|---|---|---|
| Sam Fossil | Raptor Suit | Bone Scanner | Right Wrist Strap | Camo Bandana | Shiny Mirror |
| Maya Diggs | Raptor Suit | Magnifying Lens | Right Wrist Strap | Camo Bandana | Shiny Mirror |
| Rose Valley | Triceratops Suit | Chisel Tool | Right Wrist Strap | Safari Cap | Shiny Mirror |
| Ivy Creek | Pterodactyl Suit | Chisel Tool | Left Wrist Strap | Camo Bandana | Shiny Mirror |
| Ella Fern | Triceratops Suit | Chisel Tool | Right Wrist Strap | Camo Bandana | Shiny Mirror |
| Leo Raptor | Raptor Suit | Dust Brush | Left Wrist Strap | Safari Cap | Shiny Mirror |
| Luke Tracks | Triceratops Suit | Magnifying Lens | Left Wrist Strap | Camo Bandana | Shiny Mirror |
| Zack Boulder | Pterodactyl Suit | Dust Brush | Left Wrist Strap | Pith Helmet | Squeaky Duck |
| Tina Clay | Pterodactyl Suit | Bone Scanner | Right Wrist Strap | Pith Helmet | Shiny Mirror |
| Owen Park | T-Rex Suit | Magnifying Lens | Left Wrist Strap | Camo Bandana | Shiny Mirror |
| Toby Spike | Raptor Suit | Magnifying Lens | Left Wrist Strap | Pith Helmet | Shiny Mirror |
| Rex Stone | Pterodactyl Suit | Bone Scanner | Right Wrist Strap | Camo Bandana | Shiny Mirror |
| Jack Slate | T-Rex Suit | Chisel Tool | Right Wrist Strap | Camo Bandana | Whistle Toy |
| Ruby Flint | Stegosaurus Suit | Bone Scanner | Right Wrist Strap | Pith Helmet | Whistle Toy |
| Bruno Ridge | Stegosaurus Suit | GPS Radar | Right Wrist Strap | Pith Helmet | Whistle Toy |
| Hank Dirt | Pterodactyl Suit | Chisel Tool | Right Wrist Strap | Safari Cap | Whistle Toy |
| Mia Quarry | Stegosaurus Suit | Bone Scanner | Left Wrist Strap | Camo Bandana | Shiny Mirror |
| Pete Basin | Triceratops Suit | Dust Brush | Left Wrist Strap | Pith Helmet | Shiny Mirror |
| Nina Amber | Pterodactyl Suit | GPS Radar | Right Wrist Strap | Camo Bandana | Shiny Mirror |
| Cam Mud | Stegosaurus Suit | Chisel Tool | Right Wrist Strap | Camo Bandana | Squeaky Duck |
| Nora Cliff | Raptor Suit | GPS Radar | Right Wrist Strap | Camo Bandana | Whistle Toy |
Clue 1
Addition
We counted the footprint tracks found near the tent to learn our 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
14
3
17
T
14
3
5
17
7
13
4
17
12
16
4
T
14
15
12
17
8
10
3
5
12
17
19
T
14
4
4
19
7 + 7 =T
1 + 2 =H
8 + 11 =L
5 + 11 =N
5 + 2 =F
1 + 3 =O
3 + 7 =C
5 + 3 =A
10 + 5 =U
9 + 4 =D
7 + 5 =S
1 + 4 =I
12 + 5 =E
0/13 letters found
Clue 2
Subtraction
We took away the fake fossil tracks to reveal a hidden secret message.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
W
4
16
17
1
7
11
11
11
5
W
4
5
11
17
12
5
8
18
1
17
13
7
12
16
10
13
17
W
4
12
16
11
17
12 - 8 =W
19 - 1 =O
15 - 3 =R
20 - 4 =I
20 - 3 =T
20 - 7 =H
17 - 6 =S
15 - 7 =P
15 - 5 =G
9 - 4 =A
10 - 9 =N
16 - 9 =E
0/12 letters found
Clue 3
Multiplication facts (1-12)
We checked three rows of specimen boxes to find a carved 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.
T
16
108
44
T
16
108
77
44
64
27
45
120
120
T
16
60
84
84
44
49
33
7
45
120
108
77
22
7
50
77
144
144
60
144
4 × 4 =T
7 × 11 =I
12 × 12 =R
5 × 9 =A
3 × 9 =W
8 × 8 =F
3 × 11 =B
2 × 11 =N
12 × 5 =O
7 × 12 =P
11 × 4 =E
7 × 7 =D
12 × 9 =H
5 × 10 =M
10 × 12 =S
1 × 7 =Y
0/16 letters found
Clue 4
Skip counting
We counted by twos along the dinosaur trail to spot a lost item.
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
18
120
A
18
20
45
8
A
18
30
21
A
18
30
A
18
14
A
18
65
39
27
A
18
35
35
6
21
45
30
A
18
39
27
6
6
8
27
A
18
30
120
10
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40N
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12B
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14H
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18W
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24M
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140C
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33R
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75S
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45P
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45T
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
We shared the discovery tools into equal piles to decode 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
12 ÷ 6 = ?
50 ÷ 5 = ?
30 ÷ 5 = ?
84 ÷ 12 = ?
55 ÷ 5 = ?
8 ÷ 8 = ?
48 ÷ 12 = ?
54 ÷ 6 = ?
80 ÷ 10 = ?
18 ÷ 6 = ?
36 ÷ 3 = ?
Step 2 — cross out the sentence with each answer
1.The villain charged in a Triceratops suit, then swept dirt with a dust brush.
2.The villain pounced in a Raptor suit, then peered through a magnifying lens.
3.The villain swung a Stegosaurus suit tail, then swept dirt with a dust brush.
4.The villain stomped in a T-Rex suit, then swept dirt with a dust brush.
5.The villain glided in a Pterodactyl suit, then tracked signs with a GPS radar.
6.The villain glided in a Pterodactyl suit, then scanned the mud with a bone scanner.
7.The villain glided in a Pterodactyl suit, then peered through a magnifying lens.
8.The villain pounced in a Raptor suit, then tracked signs with a GPS radar.
9.The villain stomped in a T-Rex suit, then tracked signs with a GPS radar.
10.The villain pounced in a Raptor suit, then scanned the mud with a bone scanner.
11.The villain glided in a Pterodactyl suit, then swept dirt with a dust brush.
12.The villain pounced in a Raptor suit, then swept dirt with a dust brush.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Dino Bone Mystery
Culprit: Nina Amber (Pterodactyl Suit · GPS Radar · Right Wrist Strap · Camo Bandana · Shiny Mirror)
- Clue 1 (Addition): "THE THIEF DOES NOT USE A CHISEL TOOL"7 + 7 = 14 (T) · 1 + 2 = 3 (H) · 8 + 11 = 19 (L) · 5 + 11 = 16 (N) · 5 + 2 = 7 (F) · 1 + 3 = 4 (O) · 3 + 7 = 10 (C) · 5 + 3 = 8 (A) · 10 + 5 = 15 (U) · 9 + 4 = 13 (D) · 7 + 5 = 12 (S) · 1 + 4 = 5 (I) · 12 + 5 = 17 (E)
- Clue 2 (Subtraction): "WITNESS SAW A STRAP ON THE RIGHT WRIST"12 - 8 = 4 (W) · 19 - 1 = 18 (O) · 15 - 3 = 12 (R) · 20 - 4 = 16 (I) · 20 - 3 = 17 (T) · 20 - 7 = 13 (H) · 17 - 6 = 11 (S) · 15 - 7 = 8 (P) · 15 - 5 = 10 (G) · 9 - 4 = 5 (A) · 10 - 9 = 1 (N) · 16 - 9 = 7 (E)
- Clue 3 (Multiplication facts (1-12)): "THE THIEF WAS STOPPED BY A SHINY MIRROR"4 × 4 = 16 (T) · 7 × 11 = 77 (I) · 12 × 12 = 144 (R) · 5 × 9 = 45 (A) · 3 × 9 = 27 (W) · 8 × 8 = 64 (F) · 3 × 11 = 33 (B) · 2 × 11 = 22 (N) · 12 × 5 = 60 (O) · 7 × 12 = 84 (P) · 11 × 4 = 44 (E) · 7 × 7 = 49 (D) · 12 × 9 = 108 (H) · 5 × 10 = 50 (M) · 10 × 12 = 120 (S) · 1 × 7 = 7 (Y)
- Clue 4 (Skip counting): "A CAMO BANDANA WAS TRAPPED ON A TREE BRANCH"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (A) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (B) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (H) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (W) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (M) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (C) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (R) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (S) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (P) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (T)
- Clue 5 (Division facts (1-12)): surviving statement (box 5) → Nina Amber12 ÷ 6 = 2 · 50 ÷ 5 = 10 · 30 ÷ 5 = 6 · 84 ÷ 12 = 7 · 55 ÷ 5 = 11 · 8 ÷ 8 = 1 · 48 ÷ 12 = 4 · 54 ÷ 6 = 9 · 80 ÷ 10 = 8 · 18 ÷ 6 = 3 · 36 ÷ 3 = 12
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 Bone Mystery — set in Cretaceous Camp Outpost
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects