🦕 DinosaursGrade 2Reading: grades 3-4AdditionWord problemsPlace valueSubtractionMissing addends
The Golden Fossil Mystery
A rogue dinosaur trainer has sneaked into the Dino Valley Reserve and taken the Golden Fossil! We need to track them down before they escape the valley.
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 | Favorite Dino | Ranger Gear | Active Hand | Crest Color | Dreaded Sound |
|---|---|---|---|---|---|
| Zack Gyro | Steggy | Night Vision | Right Handed | Red Crest | Camera Flash |
| Danny Dino | Raptor | Net Launcher | Left Handed | Green Scales | Camera Flash |
| Rexy Vance | Steggy | Dino Treats | Left Handed | Red Crest | Squeaky Toy |
| Penny Ptera | T-Rex | Net Launcher | Left Handed | Green Scales | Squeaky Toy |
| Spike Taylor | Tricera | Laser Lasso | Left Handed | Green Scales | Squeaky Toy |
| Daisy Diggs | Tricera | Night Vision | Left Handed | Green Scales | Loud Whistle |
| Barney Green | Tricera | Dino Treats | Right Handed | Green Scales | Squeaky Toy |
| Ellie Satler | T-Rex | Net Launcher | Left Handed | Red Crest | Squeaky Toy |
| Clara Claw | Tricera | Bubble Gun | Left Handed | Green Scales | Squeaky Toy |
| Ranger Rick | T-Rex | Night Vision | Left Handed | Blue Spikes | Squeaky Toy |
| Tracker Tom | T-Rex | Net Launcher | Right Handed | Green Scales | Camera Flash |
| Dr Steve | Ptera | Bubble Gun | Left Handed | Green Scales | Squeaky Toy |
| Bobby Bronto | Tricera | Night Vision | Right Handed | Green Scales | Camera Flash |
| Buster Bone | Tricera | Net Launcher | Left Handed | Green Scales | Camera Flash |
| Sally Swamps | Steggy | Night Vision | Left Handed | Red Crest | Camera Flash |
| Owen Raptor | Ptera | Dino Treats | Left Handed | Red Crest | Squeaky Toy |
| Steggy Mills | Ptera | Net Launcher | Left Handed | Blue Spikes | Squeaky Toy |
| Gray Valley | Ptera | Net Launcher | Left Handed | Blue Spikes | Loud Whistle |
| Alan Grant | Tricera | Night Vision | Right Handed | Red Crest | Loud Whistle |
| Raptor Ryan | Ptera | Night Vision | Left Handed | Green Scales | Loud Whistle |
| Trixie Stone | Steggy | Bubble Gun | Left Handed | Green Scales | Squeaky Toy |
Clue 1
Addition
To find the first clue, we need to count all the dinosaur tracking chips. Add the green chips and the red chips together.
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
56
32
86
T
56
32
72
86
63
24
80
86
38
95
80
T
56
98
38
86
T
56
32
86
95
86
T
56
77
69
98
95
27
32
86
79
20 + 36 =T
14 + 13 =C
32 + 40 =I
20 + 12 =H
27 + 53 =O
57 + 29 =E
12 + 12 =D
35 + 34 =A
38 + 25 =F
28 + 49 =L
56 + 39 =N
63 + 35 =U
46 + 33 =R
25 + 13 =S
0/14 letters found
Clue 2
Word problems
A friendly baby Triceratops dropped a puzzle card. Solve the word problem about feeding dino snacks to get the next clue.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
L
39
18
33
7
10
28
12
D
18
D
There were 45 toy raptors. 6 were used up. How many toy raptors are left?L
Ranger Rex lined up 5 rows of 2 dino treats. How many dino treats in all?H
Ranger Rex lined up 11 rows of 3 mud boots. How many mud boots in all?F
Ranger Rex lined up 9 rows of 2 fossil brushes. How many fossil brushes in all?E
Ranger Rex lined up 4 rows of 3 dino treats. How many dino treats in all?N
Ranger Rex lined up 7 rows of 4 fossil brushes. How many fossil brushes in all?A
Ranger Rex found 4 toy raptors yesterday and 3 more today. How many toy raptors in all?T
0/7 letters found
Clue 3
Place value
The security screen is flickering! Read the place value digits on the main computer to unlock the suspect's description.
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
98
31
81
57
77
97
95
97
73
97
57
47
77
26
27
97
21
16
92
81
97
83
57
T
98
26
57
What number has 9 tens and 8 ones?T
What number has 2 tens and 7 ones?M
What number has 9 tens and 2 ones?U
What number has 4 tens and 7 ones?F
What number has 7 tens and 3 ones?W
What number has 2 tens and 6 ones?O
What number has 1 ten and 6 ones?Q
What number has 8 tens and 3 ones?K
What number has 8 tens and 1 one?E
What number has 7 tens and 7 ones?R
What number has 9 tens and 5 ones?N
What number has 2 tens and 1 one?S
What number has 9 tens and 7 ones?A
What number has 5 tens and 7 ones?Y
What number has 3 tens and 1 one?H
0/15 letters found
Clue 4
Subtraction
Some water bottles were knocked over during the chase. Subtract the spilled bottles from the total 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.
A
63
68
43
31
42
31
33
85
88
86
31
31
71
75
42
A
63
77
31
35
A
63
75
77
31
85
81
32
31
52
43
71
82
71 - 8 =A
125 - 40 =F
101 - 26 =S
94 - 12 =D
49 - 16 =O
90 - 13 =L
65 - 22 =I
92 - 11 =T
72 - 40 =B
46 - 11 =W
71 - 19 =H
91 - 20 =N
114 - 26 =G
69 - 27 =C
48 - 17 =E
95 - 27 =P
121 - 35 =R
0/17 letters found
Clue 5
Missing addends — the last clue
We need to load the dino-copter with enough gear. Find the missing number of gear bags we need to reach the safe weight limit.
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 + ___ = 11
10 + ___ = 14
3 + ___ = 12
6 + ___ = 13
3 + ___ = 14
8 + ___ = 11
9 + ___ = 19
6 + ___ = 12
1 + ___ = 3
8 + ___ = 16
9 + ___ = 21
Step 2 — cross out the sentence with each answer
1.The villain marches with a Steggy, then shoots a giant Bubble Gun.
2.The villain soars with a Ptera, then swings a glowing Laser Lasso.
3.The villain charges with a Tricera, then peers through Night Vision.
4.The villain charges with a Tricera, then swings a glowing Laser Lasso.
5.The villain charges with a Tricera, then shoots a giant Bubble Gun.
6.The villain marches with a Steggy, then swings a glowing Laser Lasso.
7.The villain soars with a Ptera, then peers through Night Vision.
8.The villain leaps with a Raptor, then peers through Night Vision.
9.The villain soars with a Ptera, then shoots a giant Bubble Gun.
10.The villain soars with a Ptera, then fires a heavy Net Launcher.
11.The villain charges with a Tricera, then fires a heavy Net Launcher.
12.The villain rides a giant T-Rex, then peers through Night Vision.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Fossil Mystery
Culprit: Clara Claw (Tricera · Bubble Gun · Left Handed · Green Scales · Squeaky Toy)
- Clue 1 (Addition): "THE THIEF DOES NOT USE THE NET LAUNCHER"20 + 36 = 56 (T) · 14 + 13 = 27 (C) · 32 + 40 = 72 (I) · 20 + 12 = 32 (H) · 27 + 53 = 80 (O) · 57 + 29 = 86 (E) · 12 + 12 = 24 (D) · 35 + 34 = 69 (A) · 38 + 25 = 63 (F) · 28 + 49 = 77 (L) · 56 + 39 = 95 (N) · 63 + 35 = 98 (U) · 46 + 33 = 79 (R) · 25 + 13 = 38 (S)
- Clue 2 (Word problems): "LEFT HANDED"There were 45 toy raptors. 6 were used up. How many toy raptors are left? = 39 (L) · Ranger Rex lined up 5 rows of 2 dino treats. How many dino treats in all? = 10 (H) · Ranger Rex lined up 11 rows of 3 mud boots. How many mud boots in all? = 33 (F) · Ranger Rex lined up 9 rows of 2 fossil brushes. How many fossil brushes in all? = 18 (E) · Ranger Rex lined up 4 rows of 3 dino treats. How many dino treats in all? = 12 (N) · Ranger Rex lined up 7 rows of 4 fossil brushes. How many fossil brushes in all? = 28 (A) · Ranger Rex found 4 toy raptors yesterday and 3 more today. How many toy raptors in all? = 7 (T)
- Clue 3 (Place value): "THEY RAN AWAY FROM A SQUEAKY TOY"What number has 9 tens and 8 ones? = 98 (T) · What number has 2 tens and 7 ones? = 27 (M) · What number has 9 tens and 2 ones? = 92 (U) · What number has 4 tens and 7 ones? = 47 (F) · What number has 7 tens and 3 ones? = 73 (W) · What number has 2 tens and 6 ones? = 26 (O) · What number has 1 ten and 6 ones? = 16 (Q) · What number has 8 tens and 3 ones? = 83 (K) · What number has 8 tens and 1 one? = 81 (E) · What number has 7 tens and 7 ones? = 77 (R) · What number has 9 tens and 5 ones? = 95 (N) · What number has 2 tens and 1 one? = 21 (S) · What number has 9 tens and 7 ones? = 97 (A) · What number has 5 tens and 7 ones? = 57 (Y) · What number has 3 tens and 1 one? = 31 (H)
- Clue 4 (Subtraction): "A PIECE OF GREEN SCALE WAS LEFT BEHIND"71 - 8 = 63 (A) · 125 - 40 = 85 (F) · 101 - 26 = 75 (S) · 94 - 12 = 82 (D) · 49 - 16 = 33 (O) · 90 - 13 = 77 (L) · 65 - 22 = 43 (I) · 92 - 11 = 81 (T) · 72 - 40 = 32 (B) · 46 - 11 = 35 (W) · 71 - 19 = 52 (H) · 91 - 20 = 71 (N) · 114 - 26 = 88 (G) · 69 - 27 = 42 (C) · 48 - 17 = 31 (E) · 95 - 27 = 68 (P) · 121 - 35 = 86 (R)
- Clue 5 (Missing addends): surviving statement (box 5) → Clara Claw10 + ___ = 11 = 1 · 10 + ___ = 14 = 4 · 3 + ___ = 12 = 9 · 6 + ___ = 13 = 7 · 3 + ___ = 14 = 11 · 8 + ___ = 11 = 3 · 9 + ___ = 19 = 10 · 6 + ___ = 12 = 6 · 1 + ___ = 3 = 2 · 8 + ___ = 16 = 8 · 9 + ___ = 21 = 12
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Addition, Word problems, Place value, Subtraction, Missing addends
- Reading level
- grades 3-4
- Theme
- The Golden Fossil Mystery — set in Dino Valley Reserve
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects