🦕 DinosaursGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Golden Egg Mystery
Oh no! The shiny Golden Dino Egg is gone from the main nest. The ground is covered in giant footprints and crushed leaves. Ranger Bobby needs your help to track down the sneaky dinosaur who took it before the big museum opening!
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 Attack | Special Gear | Footprint Angle | Crest Color | Secret Weakness |
|---|---|---|---|---|---|
| Cera | sonic screech | glow scales | left footprint | green crest | loud whistles |
| Rex | super roar | ice breath | left footprint | red crest | sweet berries |
| Pippa | sonic screech | ice breath | left footprint | red crest | bright lights |
| Petrie | sonic screech | glow scales | right footprint | red crest | bright lights |
| Gogo | mega chomp | laser eyes | left footprint | green crest | loud whistles |
| Toby | stomp attack | jetpack flight | right footprint | red crest | bright lights |
| Rexy | mega chomp | glow scales | right footprint | green crest | loud whistles |
| Spike | super roar | glow scales | right footprint | red crest | loud whistles |
| Milo | tail whip | ice breath | right footprint | green crest | loud whistles |
| Littlefoot | sonic screech | laser eyes | left footprint | green crest | loud whistles |
| Trixie | super roar | digging claws | left footprint | green crest | loud whistles |
| Buster | stomp attack | jetpack flight | right footprint | red crest | sweet berries |
| Chomper | mega chomp | jetpack flight | left footprint | green crest | loud whistles |
| Steggy | mega chomp | jetpack flight | left footprint | green crest | sweet berries |
| Rocky | mega chomp | digging claws | left footprint | green crest | loud whistles |
| Ruby | stomp attack | glow scales | right footprint | blue crest | loud whistles |
| Trident | sonic screech | laser eyes | left footprint | red crest | loud whistles |
| Sammy | mega chomp | glow scales | left footprint | green crest | bright lights |
| Dolly | super roar | laser eyes | right footprint | green crest | loud whistles |
| Penny | tail whip | ice breath | left footprint | green crest | bright lights |
| Sandy | tail whip | jetpack flight | right footprint | red crest | loud whistles |
Clue 1
Addition
Ranger Bobby adds the path signs together to find where the thief went.
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
20
16
3
18
4
9
17
14
T
20
17
19
3
11
9
19
T
20
16
4
5
3
17
14
6
6
14
9
6
12
8
4
13
11
14 + 6 =T
8 + 10 =B
5 + 7 =C
9 + 4 =W
7 + 4 =S
4 + 1 =V
3 + 6 =N
9 + 5 =I
1 + 2 =E
12 + 4 =H
14 + 5 =O
1 + 3 =A
4 + 4 =L
3 + 3 =G
10 + 7 =D
0/15 letters found
Clue 2
Subtraction
We find dropped treats and subtract the eaten ones to get 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
1
3
13
7
4
13
14
17
16
6
19
19
T
1
2
18
15
4
T
1
9
13
14
4
7
T
1
19
T
1
3
13
9
13
6
T
1
4 - 3 =T
20 - 4 =Y
20 - 1 =O
14 - 8 =F
6 - 4 =P
18 - 5 =E
20 - 2 =R
9 - 2 =S
14 - 5 =L
6 - 3 =H
20 - 6 =A
19 - 2 =K
20 - 5 =I
11 - 7 =N
0/14 letters found
Clue 3
Skip counting
We count the muddy toe prints by twos to follow the 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
110
8
36
T
110
8
90
36
35
120
30
6
30
24
30
130
35
120
12
27
42
12
39
55
24
8
90
65
T
110
42
36
65
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33M
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28W
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150Y
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10N
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140R
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42E
Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50A
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75S
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45F
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18O
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48L
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45U
0/16 letters found
Clue 4
Place value
The locked room has a secret keypad code with tens and ones.
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
53
48
17
36
17
25
28
21
40
36
17
17
72
46
36
17
28
T
53
28
46
21
30
17
21
T
53
T
53
48
17
72
17
28
T
53
What number has 5 tens and 3 ones?T
What number has 4 tens and 6 ones?C
What number has 4 tens and 8 ones?H
What number has 4 tens and 0 ones?G
What number has 3 tens and 0 ones?L
What number has 3 tens and 6 ones?R
What number has 1 ten and 7 ones?E
What number has 2 tens and 1 one?A
What number has 7 tens and 2 ones?N
What number has 2 tens and 8 ones?S
What number has 2 tens and 5 ones?I
0/11 letters found
Clue 5
Missing addends — the last clue
We need ten fossil brushes but some are missing from the box.
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
6 + ___ = 14
9 + ___ = 19
2 + ___ = 5
10 + ___ = 16
4 + ___ = 16
10 + ___ = 17
9 + ___ = 18
10 + ___ = 21
1 + ___ = 2
7 + ___ = 12
4 + ___ = 6
Step 2 — cross out the sentence with each answer
1.The villain stomped past the big ferns, then zipped away using a rocket jetpack.
2.The villain chomped through the wooden gate, then froze the museum door with ice breath.
3.The villain chomped through the wooden gate, then zapped the lock with laser eyes.
4.The villain chomped through the wooden gate, then zipped away using a rocket jetpack.
5.The villain let out a loud rumbling roar, then scratched the dirt floor.
6.The villain let out a loud rumbling roar, then zapped the lock with laser eyes.
7.The villain made a high pitch screech, then froze the museum door with ice breath.
8.The villain made a high pitch screech, then lit up the dark room with glow scales.
9.The villain stomped past the big ferns, then zapped the lock with laser eyes.
10.The villain made a high pitch screech, then zapped the lock with laser eyes.
11.The villain stomped past the big ferns, then lit up the dark room with glow scales.
12.The villain let out a loud rumbling roar, then lit up the dark room with glow scales.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Egg Mystery
Culprit: Chomper (mega chomp · jetpack flight · left footprint · green crest · loud whistles)
- Clue 1 (Addition): "THE BANDIT DOES NOT HAVE DIGGING CLAWS"14 + 6 = 20 (T) · 8 + 10 = 18 (B) · 5 + 7 = 12 (C) · 9 + 4 = 13 (W) · 7 + 4 = 11 (S) · 4 + 1 = 5 (V) · 3 + 6 = 9 (N) · 9 + 5 = 14 (I) · 1 + 2 = 3 (E) · 12 + 4 = 16 (H) · 14 + 5 = 19 (O) · 1 + 3 = 4 (A) · 4 + 4 = 8 (L) · 3 + 3 = 6 (G) · 10 + 7 = 17 (D)
- Clue 2 (Subtraction): "THE SNEAKY FOOTPRINT LEANS TO THE LEFT"4 - 3 = 1 (T) · 20 - 4 = 16 (Y) · 20 - 1 = 19 (O) · 14 - 8 = 6 (F) · 6 - 4 = 2 (P) · 18 - 5 = 13 (E) · 20 - 2 = 18 (R) · 9 - 2 = 7 (S) · 14 - 5 = 9 (L) · 6 - 3 = 3 (H) · 20 - 6 = 14 (A) · 19 - 2 = 17 (K) · 20 - 5 = 15 (I) · 11 - 7 = 4 (N)
- Clue 3 (Skip counting): "THE THIEF RAN AWAY FROM LOUD WHISTLES"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (M) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (Y) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (N) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (R) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (E) · Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50 = 30 (A) · 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 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (I) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (F) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (O) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (L) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (U)
- Clue 4 (Place value): "THERE IS A GREEN CREST SCALE AT THE NEST"What number has 5 tens and 3 ones? = 53 (T) · What number has 4 tens and 6 ones? = 46 (C) · What number has 4 tens and 8 ones? = 48 (H) · What number has 4 tens and 0 ones? = 40 (G) · What number has 3 tens and 0 ones? = 30 (L) · What number has 3 tens and 6 ones? = 36 (R) · What number has 1 ten and 7 ones? = 17 (E) · What number has 2 tens and 1 one? = 21 (A) · What number has 7 tens and 2 ones? = 72 (N) · What number has 2 tens and 8 ones? = 28 (S) · What number has 2 tens and 5 ones? = 25 (I)
- Clue 5 (Missing addends): surviving statement (box 4) → Chomper6 + ___ = 14 = 8 · 9 + ___ = 19 = 10 · 2 + ___ = 5 = 3 · 10 + ___ = 16 = 6 · 4 + ___ = 16 = 12 · 10 + ___ = 17 = 7 · 9 + ___ = 18 = 9 · 10 + ___ = 21 = 11 · 1 + ___ = 2 = 1 · 7 + ___ = 12 = 5 · 4 + ___ = 6 = 2
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 Golden Egg Mystery — set in The Dino Valley Museum
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects