🦕 DinosaursGrade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Great Dino Egg Chase
Someone took the golden dino egg from the Dino Valley Park! Ranger Rex needs your help to find the sneaky dinosaur who did it. Look at the clues and solve the case!
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 Power | Special Skill | Footprint Type | Dino Armor | Dino Distraction |
|---|---|---|---|---|---|
| Cera | High Jump | Tree Climber | Left Footprint | Green Spikes | Loud Whistle |
| Maias | Loud Roar | Deep Digger | Left Footprint | Blue Plates | Sweet Fruit |
| Deino | Loud Roar | Swift Swimmer | Left Footprint | Green Spikes | Loud Whistle |
| Rexy | Loud Roar | Tree Climber | Right Footprint | Green Spikes | Shiny Lights |
| Toby Rex | Sharp Eye | Tree Climber | Right Footprint | Red Crest | Loud Whistle |
| Anky | Fast Dash | Deep Digger | Left Footprint | Green Spikes | Shiny Lights |
| Megal | Fast Dash | Deep Digger | Right Footprint | Green Spikes | Loud Whistle |
| Troo | High Jump | Swift Swimmer | Right Footprint | Blue Plates | Loud Whistle |
| Veloc | Hard Tail | Deep Digger | Left Footprint | Green Spikes | Shiny Lights |
| Allo | Loud Roar | Tree Climber | Left Footprint | Green Spikes | Shiny Lights |
| Steggy | High Jump | Mud Splasher | Left Footprint | Green Spikes | Shiny Lights |
| Iguan | Hard Tail | Mud Splasher | Right Footprint | Blue Plates | Shiny Lights |
| Ptera | Loud Roar | Swift Swimmer | Right Footprint | Red Crest | Loud Whistle |
| Raptor Ryan | Sharp Eye | Night Vision | Left Footprint | Blue Plates | Shiny Lights |
| Paras | Sharp Eye | Night Vision | Right Footprint | Red Crest | Shiny Lights |
| Pachy | Fast Dash | Night Vision | Left Footprint | Red Crest | Sweet Fruit |
| Barney | Sharp Eye | Deep Digger | Right Footprint | Red Crest | Loud Whistle |
| Cory | High Jump | Swift Swimmer | Right Footprint | Green Spikes | Loud Whistle |
| Trina Tri | Loud Roar | Swift Swimmer | Right Footprint | Red Crest | Shiny Lights |
| Spino | High Jump | Deep Digger | Left Footprint | Blue Plates | Shiny Lights |
| Giga | Fast Dash | Night Vision | Left Footprint | Green Spikes | Shiny Lights |
Clue 1
Addition
Ranger Rex counts the dino treats. He adds the red treats and the green treats to find the total.
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
5
20
9
T
5
20
16
9
4
16
19
14
7
T
5
3
15
17
8
19
11
12
3
19
20
9
13
1 + 4 =T
7 + 6 =R
2 + 1 =A
7 + 9 =I
5 + 2 =O
1 + 3 =F
7 + 7 =N
8 + 12 =H
12 + 7 =S
9 + 3 =L
4 + 5 =E
8 + 3 =P
7 + 8 =M
7 + 10 =U
2 + 6 =D
0/15 letters found
Clue 2
Subtraction
Some juicy leaves are gone. We take away the eaten leaves to see what is 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
8
17
3
10
2
3
5
4
1
T
8
17
6
3
18
13
3
5
9
3
10
5
13
3
18
T
8
18
16
16
T
8
15
14
6
2
T
8
13 - 5 =T
12 - 2 =S
4 - 3 =Y
11 - 6 =A
5 - 1 =K
17 - 1 =O
15 - 1 =R
19 - 2 =H
15 - 2 =L
20 - 2 =F
9 - 3 =I
17 - 2 =P
4 - 1 =E
13 - 4 =V
7 - 5 =N
0/15 letters found
Clue 3
Skip counting
We find heavy footsteps in the mud. Let us count the toes by twos to follow the path.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
U
25
26
18
26
27
130
14
33
21
130
50
27
100
26
100
39
26
100
39
16
100
27
130
26
42
18
22
26
100
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70G
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39Y
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18N
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20P
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45O
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48B
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26A
0/14 letters found
Clue 4
Place value
We find a pile of shiny rocks. We pack them in groups of ten and some single 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.
W
87
79
24
92
69
78
80
63
56
79
80
82
88
79
79
78
63
17
25
47
79
63
97
60
60
56
79
63
62
79
78
79
What number has 8 tens and 7 ones?W
What number has 6 tens and 3 ones?S
What number has 5 tens and 6 ones?H
What number has 4 tens and 7 ones?K
What number has 8 tens and 0 ones?D
What number has 1 ten and 7 ones?P
What number has 7 tens and 8 ones?N
What number has 2 tens and 4 ones?F
What number has 6 tens and 9 ones?U
What number has 8 tens and 2 ones?G
What number has 6 tens and 0 ones?T
What number has 6 tens and 2 ones?C
What number has 7 tens and 9 ones?E
What number has 8 tens and 8 ones?R
What number has 2 tens and 5 ones?I
What number has 9 tens and 2 ones?O
What number has 9 tens and 7 ones?A
0/17 letters found
Clue 5
Missing addends — the last clue
The wooden fence is broken. Six logs are safe, but we need ten total. How many are gone?
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 + ___ = 13
6 + ___ = 8
3 + ___ = 10
8 + ___ = 11
6 + ___ = 10
10 + ___ = 20
3 + ___ = 4
7 + ___ = 19
8 + ___ = 19
5 + ___ = 10
1 + ___ = 10
Step 2 — cross out the sentence with each answer
1.The villain took a high jump, then acted as a tree climber to hide.
2.The villain made a fast dash, then acted as a deep digger to hide.
3.The villain used a sharp eye, then used night vision to escape.
4.The villain used a sharp eye, then became a swift swimmer to flee.
5.The villain let out a loud roar, then used night vision to escape.
6.The villain swung a hard tail, then acted as a deep digger to hide.
7.The villain let out a loud roar, then acted as a tree climber to hide.
8.The villain made a fast dash, then used night vision to escape.
9.The villain used a sharp eye, then acted as a deep digger to hide.
10.The villain swung a hard tail, then became a swift swimmer to flee.
11.The villain let out a loud roar, then became a mud splasher to run.
12.The villain took a high jump, then became a mud splasher to run.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Dino Egg Chase
Culprit: Giga (Fast Dash · Night Vision · Left Footprint · Green Spikes · Shiny Lights)
- Clue 1 (Addition): "THE THIEF IS NOT A MUD SPLASHER"1 + 4 = 5 (T) · 7 + 6 = 13 (R) · 2 + 1 = 3 (A) · 7 + 9 = 16 (I) · 5 + 2 = 7 (O) · 1 + 3 = 4 (F) · 7 + 7 = 14 (N) · 8 + 12 = 20 (H) · 12 + 7 = 19 (S) · 9 + 3 = 12 (L) · 4 + 5 = 9 (E) · 8 + 3 = 11 (P) · 7 + 8 = 15 (M) · 7 + 10 = 17 (U) · 2 + 6 = 8 (D)
- Clue 2 (Subtraction): "THE SNEAKY THIEF LEAVES A LEFT FOOTPRINT"13 - 5 = 8 (T) · 12 - 2 = 10 (S) · 4 - 3 = 1 (Y) · 11 - 6 = 5 (A) · 5 - 1 = 4 (K) · 17 - 1 = 16 (O) · 15 - 1 = 14 (R) · 19 - 2 = 17 (H) · 15 - 2 = 13 (L) · 20 - 2 = 18 (F) · 9 - 3 = 6 (I) · 17 - 2 = 15 (P) · 4 - 1 = 3 (E) · 13 - 4 = 9 (V) · 7 - 5 = 2 (N)
- Clue 3 (Skip counting): "USE SHINY LIGHTS TO STOP THIS BEAST"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, ___, 60, 70 = 50 (G) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (Y) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (P) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (O) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (B) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (A)
- Clue 4 (Place value): "WE FOUND SHED GREEN SPIKES AT THE SCENE"What number has 8 tens and 7 ones? = 87 (W) · What number has 6 tens and 3 ones? = 63 (S) · What number has 5 tens and 6 ones? = 56 (H) · What number has 4 tens and 7 ones? = 47 (K) · What number has 8 tens and 0 ones? = 80 (D) · What number has 1 ten and 7 ones? = 17 (P) · What number has 7 tens and 8 ones? = 78 (N) · What number has 2 tens and 4 ones? = 24 (F) · What number has 6 tens and 9 ones? = 69 (U) · What number has 8 tens and 2 ones? = 82 (G) · What number has 6 tens and 0 ones? = 60 (T) · What number has 6 tens and 2 ones? = 62 (C) · What number has 7 tens and 9 ones? = 79 (E) · What number has 8 tens and 8 ones? = 88 (R) · What number has 2 tens and 5 ones? = 25 (I) · What number has 9 tens and 2 ones? = 92 (O) · What number has 9 tens and 7 ones? = 97 (A)
- Clue 5 (Missing addends): surviving statement (box 8) → Giga7 + ___ = 13 = 6 · 6 + ___ = 8 = 2 · 3 + ___ = 10 = 7 · 8 + ___ = 11 = 3 · 6 + ___ = 10 = 4 · 10 + ___ = 20 = 10 · 3 + ___ = 4 = 1 · 7 + ___ = 19 = 12 · 8 + ___ = 19 = 11 · 5 + ___ = 10 = 5 · 1 + ___ = 10 = 9
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 Great Dino Egg Chase — set in Dino Valley Park
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects