Grade 5Reading: grades 5-6Place valueAdditionSubtractionFractions of a number
The Mystery of Amber Cove
During a midnight storm, someone snuck into the camp tent, bypassed the security grid, and stole the ancient Golden Sun Disk. Expedition Delta needs your deduction skills to track down the culprit before they escape the island!
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 | Exploration Gear | Pocket Artifact | Wristband Color | Bandana Color | Phobia |
|---|---|---|---|---|---|
| Kevin Cross | Diving Scooter | Silver Coin | Wears Blue Wristband | Sapphire Bandana | Scared of Bats |
| Valerie Marsh | Grappling Hook | Silver Coin | Wears Blue Wristband | Emerald Bandana | Scared of Snakes |
| Marcus Vance | Torch Lantern | Compass Rose | Wears Red Wristband | Sapphire Bandana | Scared of Spiders |
| Alex Vance | Rope Launcher | Amber Bead | Wears Red Wristband | Sapphire Bandana | Scared of Snakes |
| Tara Cove | Grappling Hook | Jade Idol | Wears Red Wristband | Sapphire Bandana | Scared of Spiders |
| Quinn Archer | Grappling Hook | Amber Bead | Wears Blue Wristband | Sapphire Bandana | Scared of Spiders |
| Dana Explorer | Rope Launcher | Silver Coin | Wears Red Wristband | Sapphire Bandana | Scared of Bats |
| Brooke Sterling | Diving Scooter | Compass Rose | Wears Red Wristband | Sapphire Bandana | Scared of Bats |
| Ethan Huntley | Torch Lantern | Compass Rose | Wears Blue Wristband | Emerald Bandana | Scared of Spiders |
| Sam Horizon | Torch Lantern | Silver Coin | Wears Red Wristband | Sapphire Bandana | Scared of Bats |
| Laura Croft | Sonic Scanner | Amber Bead | Wears Red Wristband | Crimson Bandana | Scared of Bats |
| Julia Stone | Rope Launcher | Ruby Key | Wears Blue Wristband | Sapphire Bandana | Scared of Snakes |
| Rachel Reed | Torch Lantern | Jade Idol | Wears Blue Wristband | Emerald Bandana | Scared of Snakes |
| Piper Sands | Diving Scooter | Silver Coin | Wears Red Wristband | Sapphire Bandana | Scared of Bats |
| Nina West | Torch Lantern | Ruby Key | Wears Red Wristband | Sapphire Bandana | Scared of Bats |
| Charlie Drake | Grappling Hook | Jade Idol | Wears Blue Wristband | Sapphire Bandana | Scared of Bats |
| Fiona Flint | Rope Launcher | Jade Idol | Wears Red Wristband | Crimson Bandana | Scared of Spiders |
| Owen Wilder | Diving Scooter | Amber Bead | Wears Red Wristband | Crimson Bandana | Scared of Spiders |
| Ian Rivers | Diving Scooter | Jade Idol | Wears Blue Wristband | Emerald Bandana | Scared of Spiders |
| Wyatt Forest | Grappling Hook | Silver Coin | Wears Blue Wristband | Sapphire Bandana | Scared of Bats |
| Gabe Oakes | Diving Scooter | Jade Idol | Wears Red Wristband | Emerald Bandana | Scared of Snakes |
Clue 1
Place value
The camp security panel recorded a four-digit access code, but the numbers were scrambled by place value. Solve the digits to 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
30
600
200
60
1000
70
70
80
1000
3000
40
100
200
10
3000
100
T
30
6000
80
20
20
9000
80
20
900
90
9000
8000
200
9000
What is the value of the 3 in 476,030?T
What is the value of the 2 in 683,244?E
What is the value of the 6 in 486,021?C
What is the value of the 1 in 51,726?I
What is the value of the 1 in 580,172?O
What is the value of the 6 in 217,067?V
What is the value of the 6 in 34,634?H
What is the value of the 9 in 73,928?U
What is the value of the 4 in 67,247?D
What is the value of the 8 in 43,285?A
What is the value of the 3 in 583,178?N
What is the value of the 8 in 68,995?K
What is the value of the 9 in 521,696?B
What is the value of the 2 in 41,021?R
What is the value of the 1 in 464,810?S
What is the value of the 9 in 39,830?Y
What is the value of the 7 in 843,971?L
0/17 letters found
Clue 2
Addition
Our team gathered all the scattered expedition supply crates along the trail. Totaling up the gear weight reveals where the suspect headed.
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
7718
7811
4051
6511
5359
6388
6388
6388
9838
W
7718
9838
5808
5359
8285
W
7718
5808
7811
6388
4051
2031
9838
6511
8285
2944
6511
4051
9876
5359
9838
5808
5614
3290 + 4428 =W
3782 + 4503 =D
5270 + 4606 =H
2634 + 2725 =E
1935 + 2116 =T
5436 + 4402 =A
3740 + 1874 =M
806 + 1225 =B
5145 + 2666 =I
2825 + 3563 =S
1961 + 3847 =R
1772 + 1172 =O
3329 + 3182 =N
0/13 letters found
Clue 3
Subtraction
The dive tank pressure gauge dropped significantly after the suspect fled. Calculate the missing air volume to uncover vital evidence.
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
5877
8774
8304
4444
4645
8397
8895
3762
6496
1085
4645
6831
S
5877
S
5877
7514
4645
4946
4444
8366
6831
4562
4444
1787
6074
4444
4444
8895
3762
6496
S
5877
8304
S
5877
1567
4444
7514
6831
6819 - 942 =S
10174 - 1279 =I
6524 - 4957 =P
5242 - 597 =A
7514 - 2568 =R
8291 - 2217 =L
8655 - 351 =U
2799 - 1012 =F
8396 - 882 =C
5517 - 1755 =N
8834 - 2338 =G
4891 - 3806 =B
11077 - 2711 =D
10284 - 1887 =K
5067 - 505 =H
6827 - 2383 =E
9545 - 2714 =T
9301 - 527 =Q
0/18 letters found
Clue 4
Fractions of a number
Only a portion of the ancient stone tiles in the main hall contained hidden switches. Figure out the fraction of active tiles to decipher the note.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
B
35
14
16
30
B
35
17
31
38
17
31
17
25
37
22
30
17
38
4
14
30
7
25
20
31
25
37
30
B
35
22
17
31
32
37
2/4 of 70 =B
4/8 of 34 =A
7/8 of 8 =F
5/6 of 24 =O
2/5 of 35 =L
2/3 of 45 =E
3/6 of 8 =S
1/5 of 155 =N
5/10 of 74 =H
2/4 of 50 =T
1/5 of 160 =C
2/4 of 32 =U
2/10 of 110 =R
4/6 of 57 =D
0/14 letters found
Clue 5
Fractions of a number — the last clue
A fraction of the expedition maps were marked with red ink by the intruder. Work out the exact number of marked maps to reveal the final witness report.
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
1/5 of 5 = ?
1/6 of 30 = ?
2/4 of 14 = ?
1/4 of 32 = ?
1/8 of 16 = ?
1/6 of 18 = ?
1/3 of 33 = ?
1/10 of 120 = ?
3/6 of 18 = ?
2/4 of 8 = ?
2/6 of 18 = ?
Step 2 — cross out the sentence with each answer
1.The villain escaped underwater on a diving scooter, then dropped a shiny silver coin near the altar.
2.The villain mapped the hidden door using a sonic scanner, then snagged an amber bead on a vine.
3.The villain swung across the chasm with a grappling hook, then accidentally left behind a jade idol.
4.The villain lit up the dark cavern with a torch lantern, then accidentally left behind a jade idol.
5.The villain lit up the dark cavern with a torch lantern, then dropped a shiny silver coin near the altar.
6.The villain swung across the chasm with a grappling hook, then left a scratch with a ruby key.
7.The villain scaled the ancient stone cliff with a rope launcher, then dropped a shiny silver coin near the altar.
8.The villain lit up the dark cavern with a torch lantern, then dropped a compass rose in the mud.
9.The villain scaled the ancient stone cliff with a rope launcher, then snagged an amber bead on a vine.
10.The villain escaped underwater on a diving scooter, then dropped a compass rose in the mud.
11.The villain swung across the chasm with a grappling hook, then snagged an amber bead on a vine.
12.The villain escaped underwater on a diving scooter, then left a scratch with a ruby key.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of Amber Cove
Culprit: Brooke Sterling (Diving Scooter · Compass Rose · Wears Red Wristband · Sapphire Bandana · Scared of Bats)
- Clue 1 (Place value): "THE VILLAIN DOES NOT CARRY A RUBY KEY"What is the value of the 3 in 476,030? = 30 (T) · What is the value of the 2 in 683,244? = 200 (E) · What is the value of the 6 in 486,021? = 6000 (C) · What is the value of the 1 in 51,726? = 1000 (I) · What is the value of the 1 in 580,172? = 100 (O) · What is the value of the 6 in 217,067? = 60 (V) · What is the value of the 6 in 34,634? = 600 (H) · What is the value of the 9 in 73,928? = 900 (U) · What is the value of the 4 in 67,247? = 40 (D) · What is the value of the 8 in 43,285? = 80 (A) · What is the value of the 3 in 583,178? = 3000 (N) · What is the value of the 8 in 68,995? = 8000 (K) · What is the value of the 9 in 521,696? = 90 (B) · What is the value of the 2 in 41,021? = 20 (R) · What is the value of the 1 in 464,810? = 10 (S) · What is the value of the 9 in 39,830? = 9000 (Y) · What is the value of the 7 in 843,971? = 70 (L)
- Clue 2 (Addition): "WITNESS SAW A RED WRISTBAND ON THE ARM"3290 + 4428 = 7718 (W) · 3782 + 4503 = 8285 (D) · 5270 + 4606 = 9876 (H) · 2634 + 2725 = 5359 (E) · 1935 + 2116 = 4051 (T) · 5436 + 4402 = 9838 (A) · 3740 + 1874 = 5614 (M) · 806 + 1225 = 2031 (B) · 5145 + 2666 = 7811 (I) · 2825 + 3563 = 6388 (S) · 1961 + 3847 = 5808 (R) · 1772 + 1172 = 2944 (O) · 3329 + 3182 = 6511 (N)
- Clue 3 (Subtraction): "SQUEAKING BATS SCARED THE FLEEING SUSPECT"6819 - 942 = 5877 (S) · 10174 - 1279 = 8895 (I) · 6524 - 4957 = 1567 (P) · 5242 - 597 = 4645 (A) · 7514 - 2568 = 4946 (R) · 8291 - 2217 = 6074 (L) · 8655 - 351 = 8304 (U) · 2799 - 1012 = 1787 (F) · 8396 - 882 = 7514 (C) · 5517 - 1755 = 3762 (N) · 8834 - 2338 = 6496 (G) · 4891 - 3806 = 1085 (B) · 11077 - 2711 = 8366 (D) · 10284 - 1887 = 8397 (K) · 5067 - 505 = 4562 (H) · 6827 - 2383 = 4444 (E) · 9545 - 2714 = 6831 (T) · 9301 - 527 = 8774 (Q)
- Clue 4 (Fractions of a number): "BLUE BANDANA THREADS LEFT ON THE BRANCH"2/4 of 70 = 35 (B) · 4/8 of 34 = 17 (A) · 7/8 of 8 = 7 (F) · 5/6 of 24 = 20 (O) · 2/5 of 35 = 14 (L) · 2/3 of 45 = 30 (E) · 3/6 of 8 = 4 (S) · 1/5 of 155 = 31 (N) · 5/10 of 74 = 37 (H) · 2/4 of 50 = 25 (T) · 1/5 of 160 = 32 (C) · 2/4 of 32 = 16 (U) · 2/10 of 110 = 22 (R) · 4/6 of 57 = 38 (D)
- Clue 5 (Fractions of a number): surviving statement (box 10) → Brooke Sterling1/5 of 5 = 1 · 1/6 of 30 = 5 · 2/4 of 14 = 7 · 1/4 of 32 = 8 · 1/8 of 16 = 2 · 1/6 of 18 = 3 · 1/3 of 33 = 11 · 1/10 of 120 = 12 · 3/6 of 18 = 9 · 2/4 of 8 = 4 · 2/6 of 18 = 6
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Place value, Addition, Subtraction, Fractions of a number
- Reading level
- grades 5-6
- Theme
- The Mystery of Amber Cove — set in The Sunken Temple Ruins
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects