Grade 4Reading: grades 3-4AdditionSubtractionPlace valueWord problemsDivision
The Mystery of Bramble Cay
A glowing power crystal has vanished from the research camp on Bramble Cay! The Chief Archaeologist needs your help to decode clues, clear innocent explorers, and catch the real thief.
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 | Main Tool | Extra Gear | Observational Tell | Hair Style | Secret Weakness |
|---|---|---|---|---|---|
| Sailor Leo | Signal Flare | Compass Watch | Left Handed | Short Crop | Loud Whistles |
| Guide Uri | Signal Flare | Brass Telescope | Left Handed | Braided Hair | Itchy Pollen |
| Diver Quinn | Signal Flare | Brass Telescope | Right Handed | Curly Locks | Itchy Pollen |
| Captain Avery | Jungle Machete | Night Goggles | Left Handed | Short Crop | Loud Whistles |
| Hunter Sam | Grappling Hook | Climbing Pitons | Left Handed | Braided Hair | Bright Lights |
| Ranger Tara | Signal Flare | Climbing Pitons | Left Handed | Curly Locks | Bright Lights |
| Navigator Jasper | Jungle Machete | Climbing Pitons | Left Handed | Short Crop | Bright Lights |
| Scout Rita | Jungle Machete | Brass Telescope | Right Handed | Short Crop | Itchy Pollen |
| Explorer Vera | Glider Wings | Night Goggles | Left Handed | Curly Locks | Loud Whistles |
| Botanist Hugo | Jungle Machete | Brass Telescope | Left Handed | Braided Hair | Bright Lights |
| Professor Kora | Signal Flare | Climbing Pitons | Right Handed | Curly Locks | Loud Whistles |
| Tracker Elena | Jungle Machete | Night Goggles | Right Handed | Braided Hair | Loud Whistles |
| Explorer Clara | Grappling Hook | Pocket Radio | Left Handed | Curly Locks | Bright Lights |
| Tracker Will | Grappling Hook | Compass Watch | Right Handed | Curly Locks | Bright Lights |
| Pilot Isla | Smoke Bombs | Climbing Pitons | Left Handed | Braided Hair | Bright Lights |
| Hiker Olivia | Grappling Hook | Night Goggles | Left Handed | Braided Hair | Bright Lights |
| Dr Drake | Glider Wings | Compass Watch | Right Handed | Curly Locks | Bright Lights |
| Officer Noah | Signal Flare | Night Goggles | Left Handed | Braided Hair | Itchy Pollen |
| Cartographer Maya | Signal Flare | Night Goggles | Right Handed | Short Crop | Itchy Pollen |
| Ranger Felix | Signal Flare | Night Goggles | Left Handed | Braided Hair | Bright Lights |
| Guide Greta | Jungle Machete | Pocket Radio | Right Handed | Braided Hair | Bright Lights |
Clue 1
Addition
Our expedition team found supply crates scattered along the jungle trail. We need to add up the totals to count our gear.
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
2899
5088
2248
8801
5402
4834
4834
6371
5402
4508
9088
8853
2248
5463
4508
8853
T
2899
4350
6371
4104
4104
3181
6371
8168
4104
6371
5463
5463
T
2899
2248
4834
2248
5463
4350
8853
4802
2248
930 + 1969 =T
2414 + 2674 =H
6184 + 2904 =D
5893 + 2960 =O
2131 + 2377 =N
1294 + 1887 =Y
3145 + 2257 =I
2247 + 2103 =C
1716 + 3086 =P
1501 + 747 =E
3581 + 1882 =S
1451 + 3383 =L
5350 + 3451 =V
4285 + 2086 =A
5040 + 3128 =B
2584 + 1520 =R
0/16 letters found
Clue 2
Subtraction
Someone took food supplies from our base camp during the night. We must calculate how much is missing from our packs.
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
4616
5563
1945
5218
4713
5218
8330
1945
2752
T
4616
1264
1945
4387
T
4616
3708
1264
1945
4387
T
4616
5563
3708
8632
6819
8330
6846
4367
8632
T
4616
2807
8632
T
4616
5563
1945
1264
2807
6347
8591 - 3975 =T
5735 - 517 =S
5140 - 2388 =C
7752 - 1405 =G
5692 - 2885 =O
4998 - 3734 =L
6487 - 2779 =A
7996 - 3609 =F
5050 - 337 =U
11680 - 4834 =R
5189 - 3244 =E
9183 - 3620 =H
13162 - 4530 =N
6939 - 120 =D
7864 - 3497 =I
8948 - 618 =P
0/16 letters found
Clue 3
Place value
A locked stone door guards the ancient ruins. We need to read the digit values on the dial to unlock it.
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
100
300
80
600
500
800
800
60
500
70
400
800
80
8000
900
300
80
70
60
4000
2000
500
6000
300
T
100
800
500
6000
300
T
100
400
800
60
9000
300
80
8000
What is the value of the 1 in 5,176?T
What is the value of the 4 in 34,269?B
What is the value of the 6 in 8,613?V
What is the value of the 6 in 16,525?G
What is the value of the 4 in 3,491?F
What is the value of the 8 in 6,382?E
What is the value of the 8 in 1,824?L
What is the value of the 5 in 567?I
What is the value of the 9 in 6,921?W
What is the value of the 6 in 5,264?A
What is the value of the 3 in 327?H
What is the value of the 9 in 9,335?S
What is the value of the 2 in 2,955?R
What is the value of the 8 in 18,711?D
What is the value of the 7 in 379?N
0/15 letters found
Clue 4
Word problems
The camp scout wrote down notes about trail markers and supplies. Let us solve these story problems to track the thief.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Astrandofhairturnedupatthescene.
B
76
10
46
57
74
8
74
52
46
57
10
There were 98 torches. 22 were used up. How many torches are left?B
There were 95 canteen cups. 21 were used up. How many canteen cups are left?D
Camp scout found 27 torches yesterday and 19 more today. How many torches in all?A
Camp scout lined up 4 rows of 2 maps. How many maps in all?E
Camp scout found 2 maps yesterday and 8 more today. How many maps in all?R
There were 84 canteen cups. 27 were used up. How many canteen cups are left?I
Camp scout found 37 canteen cups yesterday and 15 more today. How many canteen cups in all?H
0/7 letters found
Clue 5
Division facts (1-12) — the last clue
We found a pile of golden coins in a hidden chest. We must split them equally into groups to pack them safely.
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
55 ÷ 5 = ?
20 ÷ 2 = ?
11 ÷ 11 = ?
81 ÷ 9 = ?
12 ÷ 4 = ?
6 ÷ 3 = ?
70 ÷ 10 = ?
72 ÷ 9 = ?
24 ÷ 6 = ?
24 ÷ 4 = ?
5 ÷ 1 = ?
Step 2 — cross out the sentence with each answer
1.The villain vanished into a cloud of smoke bombs, then anchored the rope with climbing pitons.
2.The villain vanished into a cloud of smoke bombs, then spotted the route with night goggles.
3.The villain vanished into a cloud of smoke bombs, then listened for news on a pocket radio.
4.The villain soared over the treetops on glider wings, then listened for news on a pocket radio.
5.The villain soared over the treetops on glider wings, then anchored the rope with climbing pitons.
6.The villain cleared a hidden path with a jungle machete, then checked the time using a compass watch.
7.The villain vanished into a cloud of smoke bombs, then checked the time using a compass watch.
8.The villain swung across the ravine with a grappling hook, then listened for news on a pocket radio.
9.The villain cleared a hidden path with a jungle machete, then listened for news on a pocket radio.
10.The villain swung across the ravine with a grappling hook, then spotted the route with night goggles.
11.The villain swung across the ravine with a grappling hook, then anchored the rope with climbing pitons.
12.The villain lit up the jungle sky with a signal flare, then spotted the route with night goggles.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of Bramble Cay
Culprit: Ranger Felix (Signal Flare · Night Goggles · Left Handed · Braided Hair · Bright Lights)
- Clue 1 (Addition): "THE VILLAIN DOES NOT CARRY A BRASS TELESCOPE"930 + 1969 = 2899 (T) · 2414 + 2674 = 5088 (H) · 6184 + 2904 = 9088 (D) · 5893 + 2960 = 8853 (O) · 2131 + 2377 = 4508 (N) · 1294 + 1887 = 3181 (Y) · 3145 + 2257 = 5402 (I) · 2247 + 2103 = 4350 (C) · 1716 + 3086 = 4802 (P) · 1501 + 747 = 2248 (E) · 3581 + 1882 = 5463 (S) · 1451 + 3383 = 4834 (L) · 5350 + 3451 = 8801 (V) · 4285 + 2086 = 6371 (A) · 5040 + 3128 = 8168 (B) · 2584 + 1520 = 4104 (R)
- Clue 2 (Subtraction): "THE SUSPECT LEFT A LEFT HAND PRINT ON THE LOG"8591 - 3975 = 4616 (T) · 5735 - 517 = 5218 (S) · 5140 - 2388 = 2752 (C) · 7752 - 1405 = 6347 (G) · 5692 - 2885 = 2807 (O) · 4998 - 3734 = 1264 (L) · 6487 - 2779 = 3708 (A) · 7996 - 3609 = 4387 (F) · 5050 - 337 = 4713 (U) · 11680 - 4834 = 6846 (R) · 5189 - 3244 = 1945 (E) · 9183 - 3620 = 5563 (H) · 13162 - 4530 = 8632 (N) · 6939 - 120 = 6819 (D) · 7864 - 3497 = 4367 (I) · 8948 - 618 = 8330 (P)
- Clue 3 (Place value): "THE VILLAIN FLED WHEN A BRIGHT LIGHT FLASHED"What is the value of the 1 in 5,176? = 100 (T) · What is the value of the 4 in 34,269? = 4000 (B) · What is the value of the 6 in 8,613? = 600 (V) · What is the value of the 6 in 16,525? = 6000 (G) · What is the value of the 4 in 3,491? = 400 (F) · What is the value of the 8 in 6,382? = 80 (E) · What is the value of the 8 in 1,824? = 800 (L) · What is the value of the 5 in 567? = 500 (I) · What is the value of the 9 in 6,921? = 900 (W) · What is the value of the 6 in 5,264? = 60 (A) · What is the value of the 3 in 327? = 300 (H) · What is the value of the 9 in 9,335? = 9000 (S) · What is the value of the 2 in 2,955? = 2000 (R) · What is the value of the 8 in 18,711? = 8000 (D) · What is the value of the 7 in 379? = 70 (N)
- Clue 4 (Word problems): "BRAIDED HAIR"There were 98 torches. 22 were used up. How many torches are left? = 76 (B) · There were 95 canteen cups. 21 were used up. How many canteen cups are left? = 74 (D) · Camp scout found 27 torches yesterday and 19 more today. How many torches in all? = 46 (A) · Camp scout lined up 4 rows of 2 maps. How many maps in all? = 8 (E) · Camp scout found 2 maps yesterday and 8 more today. How many maps in all? = 10 (R) · There were 84 canteen cups. 27 were used up. How many canteen cups are left? = 57 (I) · Camp scout found 37 canteen cups yesterday and 15 more today. How many canteen cups in all? = 52 (H)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Ranger Felix55 ÷ 5 = 11 · 20 ÷ 2 = 10 · 11 ÷ 11 = 1 · 81 ÷ 9 = 9 · 12 ÷ 4 = 3 · 6 ÷ 3 = 2 · 70 ÷ 10 = 7 · 72 ÷ 9 = 8 · 24 ÷ 6 = 4 · 24 ÷ 4 = 6 · 5 ÷ 1 = 5
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Addition, Subtraction, Place value, Word problems, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of Bramble Cay — set in the thick jungle of Bramble Cay
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects