🦕 DinosaursGrade 4Reading: grades 3-4Place valueAdditionSubtractionMultiplicationDivision
The Golden Dino Egg Mystery
Someone has swiped the Golden Triceratops Egg from the sanctuary hatchery! Chief Park Ranger Mary needs your math skills to track down the sneaky dino 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 Roar | Super Gear | Scratch Style | Head Crest | Scare Factor |
|---|---|---|---|---|---|
| Cope | Earth shake | Steel armor | left claw scratch | bony dome | loud whistles |
| Steggy | Forest sprint | Sonar collar | left claw scratch | spiky frill | shiny mirrors |
| Sue Rex | Spike roll | Steel armor | right claw scratch | bony dome | cold water |
| Rocky Micro | Forest sprint | Lava boots | left claw scratch | bony dome | shiny mirrors |
| Anning | Spike roll | Steel armor | right claw scratch | feathery plume | shiny mirrors |
| Pip Raptor | Spike roll | Rocket pack | right claw scratch | bony dome | shiny mirrors |
| Gigi Giga | Forest sprint | Lava boots | left claw scratch | spiky frill | cold water |
| Trudy Tricera | Tail smash | Rocket pack | right claw scratch | bony dome | loud whistles |
| Rexy | Tail smash | Prism visor | right claw scratch | spiky frill | shiny mirrors |
| Buckland | Tail smash | Lava boots | right claw scratch | spiky frill | shiny mirrors |
| Spiny Pete | Tail smash | Sonar collar | right claw scratch | bony dome | shiny mirrors |
| Barnum | Earth shake | Rocket pack | right claw scratch | bony dome | cold water |
| Horner | Spike roll | Steel armor | right claw scratch | bony dome | shiny mirrors |
| Diplo Dan | Lava leap | Sonar collar | left claw scratch | spiky frill | shiny mirrors |
| Pippa Ptero | Spike roll | Steel armor | right claw scratch | feathery plume | loud whistles |
| Marsh | Earth shake | Rocket pack | left claw scratch | bony dome | shiny mirrors |
| Toby Troodon | Tail smash | Sonar collar | right claw scratch | bony dome | loud whistles |
| Albie Allosaurus | Spike roll | Sonar collar | right claw scratch | bony dome | shiny mirrors |
| Clover Cory | Spike roll | Sonar collar | right claw scratch | bony dome | cold water |
| Buster Bronto | Lava leap | Prism visor | right claw scratch | bony dome | shiny mirrors |
| Stan T-Rex | Spike roll | Steel armor | left claw scratch | feathery plume | shiny mirrors |
Clue 1
Place value
We look at the digital incubator readout. The display lights are scrambled, but understanding the value of the hundreds place will unlock the first 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
60
300
6000
10
900
400
400
2000
900
4000
7000
40
6000
50
4000
40
T
60
200
6000
2000
8000
2000
8000
40
80
30
6000
T
60
600
2000
80
30
What is the value of the 6 in 2,563?T
What is the value of the 3 in 5,341?H
What is the value of the 6 in 6,247?E
What is the value of the 2 in 268?W
What is the value of the 8 in 28,557?R
What is the value of the 9 in 976?I
What is the value of the 4 in 14,586?N
What is the value of the 4 in 9,480?L
What is the value of the 4 in 747?O
What is the value of the 7 in 97,088?D
What is the value of the 2 in 92,019?A
What is the value of the 1 in 710?V
What is the value of the 6 in 5,674?P
What is the value of the 8 in 6,984?C
What is the value of the 5 in 751?S
What is the value of the 3 in 838?K
0/16 letters found
Clue 2
Addition
We count the giant footprints leading away from the hatchery. Adding the tracks in the mud and the tracks in the sand gives us the exact count we need.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
R
5073
8069
6876
9018
7545
5830
5377
7747
4211
2876
5830
R
5073
7747
7545
5830
9018
7683
2876
4211
7683
R
5073
7683
4451
6758
5477
4576
3139
6758
4576
7545
9018
7683
4211
7747
5377
5377
1900 + 3173 =R
3051 + 2326 =L
3557 + 4512 =I
1704 + 2747 =F
1705 + 2871 =N
3321 + 2156 =U
3239 + 4306 =T
1267 + 1609 =S
6239 + 2779 =H
3391 + 3367 =O
3034 + 2796 =C
2418 + 1793 =W
1047 + 2092 =D
3235 + 4448 =E
3272 + 4475 =A
2597 + 4279 =G
0/16 letters found
Clue 3
Subtraction
The thief broke some protective fences. Subtracting the broken fence posts from the total standing posts reveals the direction they fled.
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
8570
6767
6637
4572
6637
5209
8817
T
8570
4442
5209
2163
5209
8552
5209
1888
3694
4442
6957
4354
8817
6767
5904
2163
1888
4354
5904
4442
4442
6957
4442
8817
10892 - 2322 =T
8147 - 1190 =O
2719 - 556 =N
9336 - 4764 =B
11468 - 2651 =S
7894 - 3540 =M
4554 - 2666 =Y
8830 - 2926 =I
5631 - 422 =A
7398 - 761 =E
13548 - 4996 =W
7654 - 3960 =F
10352 - 3585 =H
5274 - 832 =R
0/14 letters found
Clue 4
Multiplication facts (1-12)
We find rows of mysterious fossilized plants crushed along the path. Multiplying the number of rows by the plants in each row gives us our next lead.
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
96
110
144
11
32
50
144
70
60
36
72
60
50
36
144
70
60
50
22
36
81
120
11
81
72
60
66
A
96
121
60
8 × 12 =A
5 × 10 =D
11 × 11 =V
10 × 11 =B
10 × 7 =M
5 × 12 =E
6 × 12 =H
11 × 1 =N
10 × 12 =I
6 × 11 =C
2 × 11 =U
6 × 6 =S
12 × 12 =O
9 × 9 =T
4 × 8 =Y
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
The ranger needs to share the energy snacks equally among the search teams. Dividing the boxes of snacks tells us which trail to follow next.
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
48 ÷ 6 = ?
108 ÷ 9 = ?
55 ÷ 11 = ?
2 ÷ 2 = ?
110 ÷ 11 = ?
56 ÷ 8 = ?
44 ÷ 11 = ?
55 ÷ 5 = ?
33 ÷ 11 = ?
9 ÷ 1 = ?
14 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain rolls like a giant spike ball, then zooms off with a rocket pack.
2.The villain leaps over the hot bubbling lava, then stomps around in hot lava boots.
3.The villain sprints through the dense fern forest, then rattles heavy steel armor.
4.The villain leaps over the hot bubbling lava, then pings everyone with a sonar collar.
5.The villain leaps over the hot bubbling lava, then flashes a bright prism visor.
6.The villain smashes the ancient stone wall, then pings everyone with a sonar collar.
7.The villain smashes the ancient stone wall, then flashes a bright prism visor.
8.The villain rolls like a giant spike ball, then pings everyone with a sonar collar.
9.The villain sprints through the dense fern forest, then zooms off with a rocket pack.
10.The villain leaps over the hot bubbling lava, then rattles heavy steel armor.
11.The villain shakes the valley floor, then pings everyone with a sonar collar.
12.The villain rolls like a giant spike ball, then rattles heavy steel armor.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Dino Egg Mystery
Culprit: Spiny Pete (Tail smash · Sonar collar · right claw scratch · bony dome · shiny mirrors)
- Clue 1 (Place value): "THE VILLAIN DOES NOT WEAR A ROCKET PACK"What is the value of the 6 in 2,563? = 60 (T) · What is the value of the 3 in 5,341? = 300 (H) · What is the value of the 6 in 6,247? = 6000 (E) · What is the value of the 2 in 268? = 200 (W) · What is the value of the 8 in 28,557? = 8000 (R) · What is the value of the 9 in 976? = 900 (I) · What is the value of the 4 in 14,586? = 4000 (N) · What is the value of the 4 in 9,480? = 400 (L) · What is the value of the 4 in 747? = 40 (O) · What is the value of the 7 in 97,088? = 7000 (D) · What is the value of the 2 in 92,019? = 2000 (A) · What is the value of the 1 in 710? = 10 (V) · What is the value of the 6 in 5,674? = 600 (P) · What is the value of the 8 in 6,984? = 80 (C) · What is the value of the 5 in 751? = 50 (S) · What is the value of the 3 in 838? = 30 (K)
- Clue 2 (Addition): "RIGHT CLAW SCRATCHES WERE FOUND ON THE WALL"1900 + 3173 = 5073 (R) · 3051 + 2326 = 5377 (L) · 3557 + 4512 = 8069 (I) · 1704 + 2747 = 4451 (F) · 1705 + 2871 = 4576 (N) · 3321 + 2156 = 5477 (U) · 3239 + 4306 = 7545 (T) · 1267 + 1609 = 2876 (S) · 6239 + 2779 = 9018 (H) · 3391 + 3367 = 6758 (O) · 3034 + 2796 = 5830 (C) · 2418 + 1793 = 4211 (W) · 1047 + 2092 = 3139 (D) · 3235 + 4448 = 7683 (E) · 3272 + 4475 = 7747 (A) · 2597 + 4279 = 6876 (G)
- Clue 3 (Subtraction): "THE BEAST RAN AWAY FROM SHINY MIRRORS"10892 - 2322 = 8570 (T) · 8147 - 1190 = 6957 (O) · 2719 - 556 = 2163 (N) · 9336 - 4764 = 4572 (B) · 11468 - 2651 = 8817 (S) · 7894 - 3540 = 4354 (M) · 4554 - 2666 = 1888 (Y) · 8830 - 2926 = 5904 (I) · 5631 - 422 = 5209 (A) · 7398 - 761 = 6637 (E) · 13548 - 4996 = 8552 (W) · 7654 - 3960 = 3694 (F) · 10352 - 3585 = 6767 (H) · 5274 - 832 = 4442 (R)
- Clue 4 (Multiplication facts (1-12)): "A BONY DOME SHED SOME DUST IN THE CAVE"8 × 12 = 96 (A) · 5 × 10 = 50 (D) · 11 × 11 = 121 (V) · 10 × 11 = 110 (B) · 10 × 7 = 70 (M) · 5 × 12 = 60 (E) · 6 × 12 = 72 (H) · 11 × 1 = 11 (N) · 10 × 12 = 120 (I) · 6 × 11 = 66 (C) · 2 × 11 = 22 (U) · 6 × 6 = 36 (S) · 12 × 12 = 144 (O) · 9 × 9 = 81 (T) · 4 × 8 = 32 (Y)
- Clue 5 (Division facts (1-12)): surviving statement (box 6) → Spiny Pete48 ÷ 6 = 8 · 108 ÷ 9 = 12 · 55 ÷ 11 = 5 · 2 ÷ 2 = 1 · 110 ÷ 11 = 10 · 56 ÷ 8 = 7 · 44 ÷ 11 = 4 · 55 ÷ 5 = 11 · 33 ÷ 11 = 3 · 9 ÷ 1 = 9 · 14 ÷ 7 = 2
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Place value, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Golden Dino Egg Mystery — set in The Great Dino Valley Sanctuary
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects