🦕 DinosaursGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Mystery of the Golden Egg
Oh no! Someone took the rare Golden T-Rex Egg from the park museum! We need to find the Fossil Bandit before the egg hatches!
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 Companion | Adventure Tool | Eyewear | Headwear | Frightened By |
|---|---|---|---|---|---|
| Trixie Horn | Pterodactyl helper | Bone Map | Glasses | Green Bandana | Squeaky Toy |
| Robert Bakker | Triceratops pet | Dino Treats | Glasses | Green Bandana | Flashlight |
| Paul Sereno | Raptor buddy | Dino Whistle | No glasses | Red Dino Cap | Bubble Blower |
| Dr Ellie | Stegosaurus pal | Bone Map | Glasses | Green Bandana | Squeaky Toy |
| Fossil Fred | Pterodactyl helper | Dino Treats | Glasses | Red Dino Cap | Bubble Blower |
| Penny Paleontologist | Stegosaurus pal | Dino Treats | Glasses | Red Dino Cap | Flashlight |
| Sue Hendrickson | Triceratops pet | Dino Whistle | No glasses | Explorer Hat | Flashlight |
| Digger Debbie | Triceratops pet | Fossil Brush | No glasses | Explorer Hat | Squeaky Toy |
| Barnum Brown | Triceratops pet | Bone Map | No glasses | Red Dino Cap | Flashlight |
| Rexy Watson | Triceratops pet | Fossil Brush | No glasses | Red Dino Cap | Bubble Blower |
| Raptor Ryan | Pterodactyl helper | Laser Pointer | Glasses | Green Bandana | Flashlight |
| Daisy Dig | Triceratops pet | Laser Pointer | No glasses | Explorer Hat | Flashlight |
| Bones Bailey | Raptor buddy | Dino Treats | No glasses | Red Dino Cap | Flashlight |
| Explorer Emily | Stegosaurus pal | Fossil Brush | Glasses | Explorer Hat | Squeaky Toy |
| Ranger Rick | Raptor buddy | Laser Pointer | No glasses | Red Dino Cap | Flashlight |
| Steggy Stone | Stegosaurus pal | Laser Pointer | Glasses | Red Dino Cap | Bubble Blower |
| Dr Grant | T-Rex friend | Dino Treats | No glasses | Red Dino Cap | Bubble Blower |
| Clara Claw | Raptor buddy | Laser Pointer | No glasses | Green Bandana | Flashlight |
| Tracker Tom | Pterodactyl helper | Dino Whistle | No glasses | Red Dino Cap | Flashlight |
| Jack Horner | Raptor buddy | Dino Whistle | No glasses | Red Dino Cap | Flashlight |
| Sammy Scales | Pterodactyl helper | Dino Whistle | Glasses | Explorer Hat | Squeaky Toy |
Clue 1
Addition
We found dinosaur footprints in the mud. Let us count how many tracks are in the front and the back. Add them together to find the 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
18
6
14
2
19
13
15
7
T
18
15
4
14
5
13
4
T
18
12
19
10
10
3
19
2
4
13
14
11
19
17
12 + 6 =T
6 + 9 =D
9 + 8 =P
1 + 1 =B
2 + 1 =Y
3 + 2 =S
6 + 8 =E
5 + 5 =R
3 + 3 =H
13 + 6 =A
2 + 2 =O
5 + 6 =M
3 + 10 =N
5 + 2 =I
9 + 3 =C
0/15 letters found
Clue 2
Subtraction
The thief dropped some dinosaur treats. A hungry baby raptor ate a few of them. Subtract the eaten treats to see how many are left!
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
2
19
4
18
4
12
19
1
T
14
3
16
19
4
9
16
T
14
8
19
17
11
10
7
17
4
4
19
4
16 - 2 =T
9 - 5 =S
10 - 1 =N
20 - 8 =P
8 - 7 =C
20 - 2 =U
11 - 9 =H
19 - 9 =G
6 - 3 =D
20 - 3 =A
13 - 2 =R
11 - 4 =L
14 - 6 =W
20 - 1 =E
19 - 3 =O
0/15 letters found
Clue 3
Skip counting
Look at these fossil boxes. They are lined up in neat rows. Skip count by twos to find the total number of fossils!
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
B
40
50
16
18
30
45
28
26
110
70
30
26
16
18
30
45
B
40
42
110
9
70
70
39
110
50
42
120
45
30
42
45
30
16
42
28
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50B
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15M
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45C
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48E
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32F
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40H
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20I
0/14 letters found
Clue 4
Place value
A park helper found a secret code on a screen. It shows tens blocks and ones blocks. Use place value to group the blocks!
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
33
46
91
23
34
59
85
90
96
46
85
85
37
59
23
52
90
80
23
59
90
61
96
90
59
52
75
What number has 3 tens and 3 ones?W
What number has 5 tens and 2 ones?C
What number has 5 tens and 9 ones?N
What number has 7 tens and 5 ones?H
What number has 8 tens and 5 ones?D
What number has 4 tens and 6 ones?E
What number has 6 tens and 1 one?B
What number has 8 tens and 0 ones?P
What number has 3 tens and 4 ones?U
What number has 9 tens and 1 one?F
What number has 9 tens and 0 ones?A
What number has 2 tens and 3 ones?O
What number has 9 tens and 6 ones?R
What number has 3 tens and 7 ones?I
0/14 letters found
Clue 5
Missing addends — the last clue
We need twelve dinosaur teeth to complete our displays, but we only have some. How many more do we need to make twelve?
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
10 + ___ = 12
2 + ___ = 5
3 + ___ = 7
8 + ___ = 9
6 + ___ = 16
8 + ___ = 14
2 + ___ = 9
2 + ___ = 14
5 + ___ = 14
7 + ___ = 18
5 + ___ = 13
Step 2 — cross out the sentence with each answer
1.The villain rides a giant t-rex, then shines a red laser pointer.
2.The villain dashes with a raptor, then shines a red laser pointer.
3.The villain dashes with a raptor, then blows a loud dino whistle.
4.The villain flies with a pterodactyl, then blows a loud dino whistle.
5.The villain dashes with a raptor, then tosses yummy dino treats.
6.The villain rides a giant t-rex, then tosses yummy dino treats.
7.The villain marches with a stegosaurus, then checks a secret bone map.
8.The villain stomps with a triceratops, then blows a loud dino whistle.
9.The villain marches with a stegosaurus, then sweeps the dirt with a brush.
10.The villain flies with a pterodactyl, then shines a red laser pointer.
11.The villain stomps with a triceratops, then shines a red laser pointer.
12.The villain marches with a stegosaurus, then blows a loud dino whistle.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Golden Egg
Culprit: Bones Bailey (Raptor buddy · Dino Treats · No glasses · Red Dino Cap · Flashlight)
- Clue 1 (Addition): "THE BANDIT DOES NOT CARRY A BONE MAP"12 + 6 = 18 (T) · 6 + 9 = 15 (D) · 9 + 8 = 17 (P) · 1 + 1 = 2 (B) · 2 + 1 = 3 (Y) · 3 + 2 = 5 (S) · 6 + 8 = 14 (E) · 5 + 5 = 10 (R) · 3 + 3 = 6 (H) · 13 + 6 = 19 (A) · 2 + 2 = 4 (O) · 5 + 6 = 11 (M) · 3 + 10 = 13 (N) · 5 + 2 = 7 (I) · 9 + 3 = 12 (C)
- Clue 2 (Subtraction): "THE SUSPECT DOES NOT WEAR GLASSES"16 - 2 = 14 (T) · 9 - 5 = 4 (S) · 10 - 1 = 9 (N) · 20 - 8 = 12 (P) · 8 - 7 = 1 (C) · 20 - 2 = 18 (U) · 11 - 9 = 2 (H) · 19 - 9 = 10 (G) · 6 - 3 = 3 (D) · 20 - 3 = 17 (A) · 13 - 2 = 11 (R) · 11 - 4 = 7 (L) · 14 - 6 = 8 (W) · 20 - 1 = 19 (E) · 19 - 3 = 16 (O)
- Clue 3 (Skip counting): "BRIGHT FLASHLIGHT BEAMS SCARED THE THIEF"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (B) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (M) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (F) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, ___, 35, 40 = 30 (H) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (I)
- Clue 4 (Place value): "WE FOUND A RED DINO CAP ON A BRANCH"What number has 3 tens and 3 ones? = 33 (W) · What number has 5 tens and 2 ones? = 52 (C) · What number has 5 tens and 9 ones? = 59 (N) · What number has 7 tens and 5 ones? = 75 (H) · What number has 8 tens and 5 ones? = 85 (D) · What number has 4 tens and 6 ones? = 46 (E) · What number has 6 tens and 1 one? = 61 (B) · What number has 8 tens and 0 ones? = 80 (P) · What number has 3 tens and 4 ones? = 34 (U) · What number has 9 tens and 1 one? = 91 (F) · What number has 9 tens and 0 ones? = 90 (A) · What number has 2 tens and 3 ones? = 23 (O) · What number has 9 tens and 6 ones? = 96 (R) · What number has 3 tens and 7 ones? = 37 (I)
- Clue 5 (Missing addends): surviving statement (box 5) → Bones Bailey10 + ___ = 12 = 2 · 2 + ___ = 5 = 3 · 3 + ___ = 7 = 4 · 8 + ___ = 9 = 1 · 6 + ___ = 16 = 10 · 8 + ___ = 14 = 6 · 2 + ___ = 9 = 7 · 2 + ___ = 14 = 12 · 5 + ___ = 14 = 9 · 7 + ___ = 18 = 11 · 5 + ___ = 13 = 8
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Skip counting, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Mystery of the Golden Egg — set in Dino Valley Discovery Park
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects