Grade 4Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision
The Lost Compass Mystery
Someone snuck into the Whispering Pines clubhouse and snatched the golden camp trophy! Ranger Sam found clues on the trail to help figure out who did it.
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 Gadget | Extra Tool | Handedness | Hair Color | Weakness |
|---|---|---|---|---|---|
| Mason Rivera | Compass Watch | Pocket Telescope | Right Handed | Red Hair | Bright Light |
| Ethan Zhang | Grappling Hook | Paracord Rope | Left Handed | Blonde Hair | Scent of Vanilla |
| Grace Mercer | Torch Flashlight | Bronze Key | Right Handed | Black Hair | Scent of Vanilla |
| Sophia Chen | Compass Watch | Pocket Telescope | Right Handed | Red Hair | Loud Noises |
| Noah Miller | Compass Watch | Survival Whistle | Left Handed | Black Hair | Scent of Vanilla |
| Ava Jackson | Smoke Pellets | Paracord Rope | Right Handed | Blonde Hair | Bright Light |
| Liam Obrien | Torch Flashlight | Bronze Key | Left Handed | Blonde Hair | Scent of Vanilla |
| Lucas Kim | Decoder Ring | Survival Whistle | Right Handed | Black Hair | Loud Noises |
| Caleb Thorne | Torch Flashlight | Survival Whistle | Left Handed | Black Hair | Scent of Vanilla |
| Aaliyah Reed | Compass Watch | Pocket Telescope | Left Handed | Blonde Hair | Bright Light |
| Owen Sterling | Decoder Ring | Pocket Telescope | Right Handed | Black Hair | Bright Light |
| Ruby Rhodes | Smoke Pellets | Paracord Rope | Right Handed | Black Hair | Loud Noises |
| Nora Vance | Smoke Pellets | Pocket Telescope | Right Handed | Black Hair | Loud Noises |
| Isaac Connor | Torch Flashlight | Trail Chalk | Left Handed | Black Hair | Loud Noises |
| Samir Patel | Torch Flashlight | Pocket Telescope | Left Handed | Black Hair | Loud Noises |
| Maya Lin | Decoder Ring | Survival Whistle | Left Handed | Blonde Hair | Scent of Vanilla |
| Aria Montgomery | Torch Flashlight | Bronze Key | Right Handed | Blonde Hair | Loud Noises |
| Diego Cruz | Compass Watch | Bronze Key | Right Handed | Black Hair | Loud Noises |
| Ella Dubois | Grappling Hook | Bronze Key | Right Handed | Black Hair | Loud Noises |
| Eli Hudson | Compass Watch | Pocket Telescope | Left Handed | Red Hair | Scent of Vanilla |
| Zoe Castiglione | Smoke Pellets | Pocket Telescope | Left Handed | Black Hair | Loud Noises |
Clue 1
Addition
Ranger Sam gathers up all the loose trail maps left at camp to total them up.
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
4385
8634
7186
3159
3678
8737
8737
6007
3678
9048
9019
7704
7186
9869
9048
7704
T
4385
7920
9869
7186
6007
5790
7704
4342
7950
7186
T
4385
T
4385
7186
8737
7186
9869
4342
7704
5790
7186
2492 + 1893 =T
4257 + 2929 =E
4651 + 4368 =D
5051 + 4818 =S
1400 + 2278 =I
3170 + 5464 =H
4290 + 4447 =L
2370 + 1972 =C
2099 + 1060 =V
3959 + 1831 =P
5164 + 3884 =N
5443 + 2477 =U
3839 + 2168 =A
5159 + 2545 =O
5316 + 2634 =K
0/15 letters found
Clue 2
Rounding
The outpost scanner display only shows rounded distances to nearby landmarks.
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
370
700
1300
20
200
T
370
290
1300
9000
9000
290
2000
T
370
200
30
1300
7000
70
2900
200
5000
700
T
370
700
70
290
7000
1300
7000
430
200
1700
1700
70
200
290
Round 373 to the nearest tenT
Round 8,647 to the nearest thousandS
Round 6,701 to the nearest thousandD
Round 5,007 to the nearest thousandG
Round 1,283 to the nearest hundredE
Round 239 to the nearest hundredI
Round 1,737 to the nearest hundredL
Round 1,914 to the nearest thousandO
Round 2,858 to the nearest hundredR
Round 692 to the nearest hundredH
Round 29 to the nearest tenC
Round 71 to the nearest tenA
Round 292 to the nearest tenN
Round 23 to the nearest tenW
Round 430 to the nearest tenV
0/15 letters found
Clue 3
Subtraction
Ranger Sam checks the remaining supply crates after taking out used items.
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
6854
3000
3332
8130
8204
1378
1378
8633
8204
5224
1348
8633
5224
8633
4760
8633
5956
2389
1348
3773
4305
1378
3773
7334
3357
5224
3773
8204
5742
3332
5742
7779 - 925 =T
3564 - 564 =H
7417 - 83 =U
1745 - 397 =R
8255 - 4898 =D
9031 - 3075 =Y
9092 - 459 =A
8617 - 4844 =O
9230 - 3488 =S
8226 - 3921 =M
3302 - 1924 =L
6899 - 3567 =E
7358 - 4969 =F
9301 - 4077 =N
9972 - 1768 =I
8492 - 362 =V
8160 - 3400 =W
0/17 letters found
Clue 4
Multiplication facts (1-12)
The team counts gear bags arranged in equal rows inside the supply tent.
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
55
90
100
77
110
60
33
48
100
21
110
4
66
144
49
108
T
55
72
49
66
144
110
21
14
60
49
48
44
90
49
33
72
11 × 5 =T
7 × 2 =B
1 × 4 =U
10 × 9 =H
12 × 4 =C
10 × 10 =E
3 × 7 =F
6 × 12 =R
11 × 3 =I
12 × 12 =D
7 × 7 =A
11 × 7 =P
4 × 11 =K
11 × 10 =O
9 × 12 =S
6 × 10 =L
11 × 6 =N
0/17 letters found
Clue 5
Division facts (1-12) — the last clue
Ranger Sam splits up the discovery badges equally among the scout groups.
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
3 ÷ 1 = ?
14 ÷ 7 = ?
16 ÷ 2 = ?
60 ÷ 10 = ?
10 ÷ 2 = ?
32 ÷ 8 = ?
70 ÷ 10 = ?
22 ÷ 2 = ?
108 ÷ 12 = ?
36 ÷ 3 = ?
7 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain lit up the dark cavern with a torch flashlight, then marked a secret path using trail chalk.
2.The villain escaped behind a cloud of smoke pellets, then tied up the camp gate using paracord rope.
3.The villain checked directions with a compass watch, then unlocked the side door with a bronze key.
4.The villain unlocked the ancient chest with a decoder ring, then tied up the camp gate using paracord rope.
5.The villain checked directions with a compass watch, then scouted the high ridge with a pocket telescope.
6.The villain escaped behind a cloud of smoke pellets, then scouted the high ridge with a pocket telescope.
7.The villain checked directions with a compass watch, then blew a sharp warning on a survival whistle.
8.The villain swung across the canyon with a grappling hook, then unlocked the side door with a bronze key.
9.The villain escaped behind a cloud of smoke pellets, then blew a sharp warning on a survival whistle.
10.The villain unlocked the ancient chest with a decoder ring, then blew a sharp warning on a survival whistle.
11.The villain escaped behind a cloud of smoke pellets, then marked a secret path using trail chalk.
12.The villain escaped behind a cloud of smoke pellets, then unlocked the side door with a bronze key.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Compass Mystery
Culprit: Lucas Kim (Decoder Ring · Survival Whistle · Right Handed · Black Hair · Loud Noises)
- Clue 1 (Addition): "THE VILLAIN DOES NOT USE A POCKET TELESCOPE"2492 + 1893 = 4385 (T) · 4257 + 2929 = 7186 (E) · 4651 + 4368 = 9019 (D) · 5051 + 4818 = 9869 (S) · 1400 + 2278 = 3678 (I) · 3170 + 5464 = 8634 (H) · 4290 + 4447 = 8737 (L) · 2370 + 1972 = 4342 (C) · 2099 + 1060 = 3159 (V) · 3959 + 1831 = 5790 (P) · 5164 + 3884 = 9048 (N) · 5443 + 2477 = 7920 (U) · 3839 + 2168 = 6007 (A) · 5159 + 2545 = 7704 (O) · 5316 + 2634 = 7950 (K)
- Clue 2 (Rounding): "THE WITNESS NOTICED A RIGHT HANDED VILLAIN"Round 373 to the nearest ten = 370 (T) · Round 8,647 to the nearest thousand = 9000 (S) · Round 6,701 to the nearest thousand = 7000 (D) · Round 5,007 to the nearest thousand = 5000 (G) · Round 1,283 to the nearest hundred = 1300 (E) · Round 239 to the nearest hundred = 200 (I) · Round 1,737 to the nearest hundred = 1700 (L) · Round 1,914 to the nearest thousand = 2000 (O) · Round 2,858 to the nearest hundred = 2900 (R) · Round 692 to the nearest hundred = 700 (H) · Round 29 to the nearest ten = 30 (C) · Round 71 to the nearest ten = 70 (A) · Round 292 to the nearest ten = 290 (N) · Round 23 to the nearest ten = 20 (W) · Round 430 to the nearest ten = 430 (V)
- Clue 3 (Subtraction): "THE VILLAIN RAN AWAY FROM LOUD NOISES"7779 - 925 = 6854 (T) · 3564 - 564 = 3000 (H) · 7417 - 83 = 7334 (U) · 1745 - 397 = 1348 (R) · 8255 - 4898 = 3357 (D) · 9031 - 3075 = 5956 (Y) · 9092 - 459 = 8633 (A) · 8617 - 4844 = 3773 (O) · 9230 - 3488 = 5742 (S) · 8226 - 3921 = 4305 (M) · 3302 - 1924 = 1378 (L) · 6899 - 3567 = 3332 (E) · 7358 - 4969 = 2389 (F) · 9301 - 4077 = 5224 (N) · 9972 - 1768 = 8204 (I) · 8492 - 362 = 8130 (V) · 8160 - 3400 = 4760 (W)
- Clue 4 (Multiplication facts (1-12)): "THE POLICE FOUND A STRAND OF BLACK HAIR"11 × 5 = 55 (T) · 7 × 2 = 14 (B) · 1 × 4 = 4 (U) · 10 × 9 = 90 (H) · 12 × 4 = 48 (C) · 10 × 10 = 100 (E) · 3 × 7 = 21 (F) · 6 × 12 = 72 (R) · 11 × 3 = 33 (I) · 12 × 12 = 144 (D) · 7 × 7 = 49 (A) · 11 × 7 = 77 (P) · 4 × 11 = 44 (K) · 11 × 10 = 110 (O) · 9 × 12 = 108 (S) · 6 × 10 = 60 (L) · 11 × 6 = 66 (N)
- Clue 5 (Division facts (1-12)): surviving statement (box 10) → Lucas Kim3 ÷ 1 = 3 · 14 ÷ 7 = 2 · 16 ÷ 2 = 8 · 60 ÷ 10 = 6 · 10 ÷ 2 = 5 · 32 ÷ 8 = 4 · 70 ÷ 10 = 7 · 22 ÷ 2 = 11 · 108 ÷ 12 = 9 · 36 ÷ 3 = 12 · 7 ÷ 7 = 1
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Addition, Rounding, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Lost Compass Mystery — set in Whispering Pines Adventure Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects