🦕 Dinosaurs, PiratesGrade 7Reading: grades 7-9Place valueSubtractionAdditionFractions of a number
The Mystery of the Jurassic Corsair
A rogue buccaneer mounted on a armored prehistoric beast raided the harbor vault and escaped into the jungle mist. Clues left across the dockyard will reveal the culprit.
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 | Mount Ability | Pirate Gear | Dominant Hand | Hairstyle | Repellent |
|---|---|---|---|---|---|
| Woodes Rogers | Pterodactyl Flight | Golden Compass | Left-handed | Crimson Dreadlocks | Stinky Kelp |
| Howell Davis | Spinosaurus Swim | Smoke Bomb | Left-handed | Crimson Dreadlocks | Loud Whistles |
| George Lowther | TRex Strength | Cursed Cutlass | Left-handed | Sandy Blonde Locks | Stinky Kelp |
| John Coxon | TRex Strength | Brass Spyglass | Right-handed | Black Braids | Loud Whistles |
| Mary Read | TRex Strength | Cursed Cutlass | Left-handed | Crimson Dreadlocks | Stinky Kelp |
| Alexander Exquemelin | Triceratops Armor | Flintlock Blaster | Right-handed | Black Braids | Bright Flares |
| Zheng Yi Sao | Raptor Speed | Brass Spyglass | Left-handed | Black Braids | Bright Flares |
| Charles Vane | Pterodactyl Flight | Brass Spyglass | Left-handed | Sandy Blonde Locks | Loud Whistles |
| William Fly | Pterodactyl Flight | Flintlock Blaster | Left-handed | Sandy Blonde Locks | Loud Whistles |
| Charlotte de Berry | Triceratops Armor | Golden Compass | Left-handed | Black Braids | Loud Whistles |
| Samuel Bellamy | Spinosaurus Swim | Brass Spyglass | Left-handed | Sandy Blonde Locks | Loud Whistles |
| Ned Low | Triceratops Armor | Smoke Bomb | Right-handed | Sandy Blonde Locks | Bright Flares |
| William Kidd | Triceratops Armor | Flintlock Blaster | Left-handed | Black Braids | Stinky Kelp |
| Jack Rackham | Raptor Speed | Brass Spyglass | Left-handed | Sandy Blonde Locks | Stinky Kelp |
| Edward England | Spinosaurus Swim | Golden Compass | Right-handed | Sandy Blonde Locks | Loud Whistles |
| Stede Bonnet | TRex Strength | Golden Compass | Left-handed | Sandy Blonde Locks | Loud Whistles |
| Blackbeard Teach | Triceratops Armor | Cursed Cutlass | Left-handed | Sandy Blonde Locks | Loud Whistles |
| Grace O Malley | Pterodactyl Flight | Golden Compass | Right-handed | Black Braids | Stinky Kelp |
| Thomas Tew | TRex Strength | Cursed Cutlass | Left-handed | Crimson Dreadlocks | Loud Whistles |
| Bartholomew Roberts | TRex Strength | Cursed Cutlass | Right-handed | Crimson Dreadlocks | Loud Whistles |
| Anne Bonny | Spinosaurus Swim | Smoke Bomb | Right-handed | Black Braids | Stinky Kelp |
Clue 1
Place value
The harbor guard logged the vault security code on a ledger, but the digits were shifted across place values.
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
8000
100
900
1000
700
1000
5000
900
6000
T
8000
800
70
900
1000
200
70
T
8000
700
1000
900
80
6000
700
600
1000
900
800
6000
700
T
8000
7000
80
1000
1000
What is the value of the 8 in 18,551?T
What is the value of the 9 in 54,962?E
What is the value of the 7 in 55,175?O
What is the value of the 6 in 516,731?C
What is the value of the 1 in 98,102?H
What is the value of the 7 in 960,742?U
What is the value of the 5 in 65,993?P
What is the value of the 6 in 43,693?R
What is the value of the 7 in 87,860?L
What is the value of the 1 in 41,383?S
What is the value of the 8 in 77,282?A
What is the value of the 2 in 469,265?N
What is the value of the 8 in 693,800?D
0/13 letters found
Clue 2
Subtraction
The quartermaster subtracted the stolen crates from the dock manifests to pinpoint where the saboteur struck.
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
2949
3928
6496
7902
3252
8730
A
2949
8153
8338
6496
8338
4651
4660
5278
A
2949
3252
6496
7641
5278
A
2949
2601
2601
6496
8338
3252
8730
6496
5278
6496
4660
8153
4530
7522 - 4573 =A
6492 - 1962 =S
5723 - 1072 =P
4875 - 2274 =B
12210 - 3480 =H
7174 - 3922 =T
8594 - 441 =N
8320 - 418 =F
7279 - 3351 =L
10556 - 2915 =G
4709 - 49 =I
7761 - 1265 =E
8797 - 459 =D
6887 - 1609 =R
0/14 letters found
Clue 3
Addition
By tallying all the extra dinosaur feed sacks dumped near the dock, the detective calculated the total weight.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
L
5105
9636
5651
9657
9736
3172
7460
2480
9712
L
5105
5753
2480
2480
9899
5641
8339
5753
9657
9712
3172
5753
9657
7460
2147
9636
8339
5641
7460
9657
5753
8339
1861 + 3244 =L
2816 + 4644 =I
4081 + 5655 =W
5603 + 2736 =R
1444 + 703 =N
5357 + 4355 =T
1399 + 1081 =S
6304 + 3332 =O
3076 + 2677 =E
2546 + 3105 =U
2819 + 2822 =A
4785 + 4872 =D
2165 + 1007 =H
6068 + 3831 =C
0/14 letters found
Clue 4
Fractions of a number
The navigator examined a fraction of the harbor chart to isolate the suspect escape route.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
S
38
27
12
11
51
18
34
29
12
11
57
34
29
19
46
S
38
36
57
34
34
29
12
49
33
57
S
38
27
11
11
34
57
4/6 of 57 =S
1/2 of 22 =D
2/3 of 69 =K
3/10 of 190 =E
1/8 of 96 =N
1/2 of 98 =T
6/10 of 55 =H
3/6 of 72 =F
2/10 of 170 =L
1/3 of 153 =Y
1/10 of 180 =B
6/8 of 36 =A
5/10 of 58 =O
1/10 of 190 =C
0/14 letters found
Clue 5
Fractions of a number — the last clue
Analyzing a fraction of the remaining tracks along the muddy shore revealed another vital detail.
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
2/4 of 8 = ?
2/6 of 18 = ?
4/8 of 16 = ?
5/8 of 8 = ?
2/10 of 15 = ?
2/3 of 15 = ?
1/3 of 3 = ?
4/8 of 24 = ?
5/10 of 4 = ?
1/5 of 55 = ?
3/8 of 24 = ?
Step 2 — cross out the sentence with each answer
1.The villain escapes through deep waters with spinosaurus swim, then vanishes into thick clouds from a smoke bomb.
2.The villain rams cargo crates using triceratops armor, then vanishes into thick clouds from a smoke bomb.
3.The villain rams cargo crates using triceratops armor, then swings a cursed cutlass through the air.
4.The villain soars above the bay with pterodactyl flight, then scouts the watchtowers with a brass spyglass.
5.The villain soars above the bay with pterodactyl flight, then vanishes into thick clouds from a smoke bomb.
6.The villain escapes through deep waters with spinosaurus swim, then scouts the watchtowers with a brass spyglass.
7.The villain soars above the bay with pterodactyl flight, then fires warning shots with a flintlock blaster.
8.The villain smashes heavy iron locks with trex strength, then navigates foggy reefs with a golden compass.
9.The villain charges through harbor gates with raptor speed, then scouts the watchtowers with a brass spyglass.
10.The villain soars above the bay with pterodactyl flight, then swings a cursed cutlass through the air.
11.The villain escapes through deep waters with spinosaurus swim, then fires warning shots with a flintlock blaster.
12.The villain charges through harbor gates with raptor speed, then fires warning shots with a flintlock blaster.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Jurassic Corsair
Culprit: William Fly (Pterodactyl Flight · Flintlock Blaster · Left-handed · Sandy Blonde Locks · Loud Whistles)
- Clue 1 (Place value): "THE SUSPECT DOES NOT USE A CURSED CUTLASS"What is the value of the 8 in 18,551? = 8000 (T) · What is the value of the 9 in 54,962? = 900 (E) · What is the value of the 7 in 55,175? = 70 (O) · What is the value of the 6 in 516,731? = 6000 (C) · What is the value of the 1 in 98,102? = 100 (H) · What is the value of the 7 in 960,742? = 700 (U) · What is the value of the 5 in 65,993? = 5000 (P) · What is the value of the 6 in 43,693? = 600 (R) · What is the value of the 7 in 87,860? = 7000 (L) · What is the value of the 1 in 41,383? = 1000 (S) · What is the value of the 8 in 77,282? = 80 (A) · What is the value of the 2 in 469,265? = 200 (N) · What is the value of the 8 in 693,800? = 800 (D)
- Clue 2 (Subtraction): "A LEFT HANDED PIRATE GRABBED THE REINS"7522 - 4573 = 2949 (A) · 6492 - 1962 = 4530 (S) · 5723 - 1072 = 4651 (P) · 4875 - 2274 = 2601 (B) · 12210 - 3480 = 8730 (H) · 7174 - 3922 = 3252 (T) · 8594 - 441 = 8153 (N) · 8320 - 418 = 7902 (F) · 7279 - 3351 = 3928 (L) · 10556 - 2915 = 7641 (G) · 4709 - 49 = 4660 (I) · 7761 - 1265 = 6496 (E) · 8797 - 459 = 8338 (D) · 6887 - 1609 = 5278 (R)
- Clue 3 (Addition): "LOUD WHISTLES SCARED THE DINO RAIDER"1861 + 3244 = 5105 (L) · 2816 + 4644 = 7460 (I) · 4081 + 5655 = 9736 (W) · 5603 + 2736 = 8339 (R) · 1444 + 703 = 2147 (N) · 5357 + 4355 = 9712 (T) · 1399 + 1081 = 2480 (S) · 6304 + 3332 = 9636 (O) · 3076 + 2677 = 5753 (E) · 2546 + 3105 = 5651 (U) · 2819 + 2822 = 5641 (A) · 4785 + 4872 = 9657 (D) · 2165 + 1007 = 3172 (H) · 6068 + 3831 = 9899 (C)
- Clue 4 (Fractions of a number): "SANDY BLONDE LOCKS FELL ON THE SADDLE"4/6 of 57 = 38 (S) · 1/2 of 22 = 11 (D) · 2/3 of 69 = 46 (K) · 3/10 of 190 = 57 (E) · 1/8 of 96 = 12 (N) · 1/2 of 98 = 49 (T) · 6/10 of 55 = 33 (H) · 3/6 of 72 = 36 (F) · 2/10 of 170 = 34 (L) · 1/3 of 153 = 51 (Y) · 1/10 of 180 = 18 (B) · 6/8 of 36 = 27 (A) · 5/10 of 58 = 29 (O) · 1/10 of 190 = 19 (C)
- Clue 5 (Fractions of a number): surviving statement (box 7) → William Fly2/4 of 8 = 4 · 2/6 of 18 = 6 · 4/8 of 16 = 8 · 5/8 of 8 = 5 · 2/10 of 15 = 3 · 2/3 of 15 = 10 · 1/3 of 3 = 1 · 4/8 of 24 = 12 · 5/10 of 4 = 2 · 1/5 of 55 = 11 · 3/8 of 24 = 9
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Place value, Subtraction, Addition, Fractions of a number
- Reading level
- grades 7-9
- Theme
- The Mystery of the Jurassic Corsair — set in Isla Sauria Harbor
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects