Grade 7Reading: grades 3-4MultiplicationSubtractionAdditionPlace valueTwo-step equations
The Lost Compass Mystery
Someone snuck into Jungle Camp Alpha and snatched the Golden Compass from the Chief Expeditioner! Use your math skills to eliminate suspects and find the camp bandit.
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 Gear | Extra Tool | Habit | Hair Style | Foiled By |
|---|---|---|---|---|---|
| Trekker Luke | Grappling Hook | Binoculars | Taps Left Foot | Spiky Black | Flash Bomb |
| Pilot Nina | Grappling Hook | Matchbox | Taps Right Foot | Spiky Black | Net Snare |
| Hunter Ivy | Jungle Machete | Binoculars | Taps Left Foot | Curly Brown | Net Snare |
| Rover Dan | Grappling Hook | Walkie Talkie | Taps Right Foot | Braided Red | Net Snare |
| Tracker Sam | Pocket Drone | Rope Coil | Taps Left Foot | Spiky Black | Net Snare |
| Surveyor Owen | Signal Flare | Rope Coil | Taps Right Foot | Braided Red | Flash Bomb |
| Veteran Ruth | Jungle Machete | Matchbox | Taps Right Foot | Braided Red | Net Snare |
| Ranger Jack | Jungle Machete | Binoculars | Taps Left Foot | Curly Brown | Mud Trap |
| Pathfinder Ava | Grappling Hook | Rope Coil | Taps Right Foot | Braided Red | Net Snare |
| Dr Kai | Jungle Machete | Matchbox | Taps Left Foot | Curly Brown | Flash Bomb |
| Adventurer Chloe | Map Compass | Flashlight | Taps Left Foot | Curly Brown | Mud Trap |
| Pioneer Noah | Grappling Hook | Walkie Talkie | Taps Left Foot | Braided Red | Net Snare |
| Wilderness Jade | Map Compass | Rope Coil | Taps Right Foot | Curly Brown | Flash Bomb |
| Navigator Mia | Pocket Drone | Binoculars | Taps Right Foot | Braided Red | Net Snare |
| Officer Zoe | Jungle Machete | Rope Coil | Taps Right Foot | Spiky Black | Net Snare |
| Captain Leo | Pocket Drone | Rope Coil | Taps Right Foot | Braided Red | Net Snare |
| Rookie Cole | Signal Flare | Rope Coil | Taps Left Foot | Spiky Black | Net Snare |
| Guide Ben | Grappling Hook | Rope Coil | Taps Right Foot | Curly Brown | Flash Bomb |
| Outrider Ian | Grappling Hook | Flashlight | Taps Right Foot | Spiky Black | Mud Trap |
| Professor Amy | Jungle Machete | Walkie Talkie | Taps Left Foot | Braided Red | Net Snare |
| Agent Max | Map Compass | Flashlight | Taps Left Foot | Spiky Black | Flash Bomb |
Clue 1
Multiplication facts (1-12)
To count the supplies packed in equal crates, you need to do multiplication.
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
44
88
120
144
12
120
63
121
110
11
63
12
3
10
T
44
3
35
120
144
12
35
T
44
28
63
81
81
110
11
10
12
35
28
33
14
63
81
144
4 × 11 =T
9 × 9 =R
7 × 4 =C
9 × 7 =A
12 × 10 =E
12 × 12 =S
7 × 2 =L
11 × 3 =U
10 × 1 =I
1 × 3 =D
11 × 1 =B
8 × 11 =H
7 × 5 =O
11 × 10 =Y
6 × 2 =N
11 × 11 =K
0/16 letters found
Clue 2
Subtraction
To find out how many supply crates are left after the raid, subtract the lost 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.
A
5045
2494
2034
7823
3263
5125
7560
7560
7560
A
5045
2494
7823
1092
5125
5792
A
5045
3263
4224
2034
7823
7823
A
5045
7819
7823
1092
5125
2034
2084
2084
2034
6241
1092
7823
7333
4849
4849
7823
6428 - 1383 =A
6961 - 720 =G
10339 - 2516 =T
5027 - 2943 =R
9413 - 1853 =S
3395 - 132 =N
10341 - 4549 =B
8337 - 518 =P
4530 - 2496 =I
4968 - 119 =O
5314 - 4222 =H
5764 - 3270 =W
6679 - 2455 =D
8332 - 3207 =E
9568 - 2235 =F
0/15 letters found
Clue 3
Addition
To total up all the clues gathered from the north and south trails, add them together.
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
6009
6581
3883
6581
3883
3350
2787
5285
T
6009
2787
5979
5979
3883
2121
T
6009
6581
3883
7721
6647
4900
4900
9897
6647
6953
6088
6647
T
6009
6581
9897
6953
3883
T
6009
5285
6953
9897
3350
3883
1924 + 4085 =T
3646 + 3307 =N
3693 + 2395 =W
656 + 1465 =D
1417 + 1370 =O
2248 + 1102 =R
3240 + 2739 =P
2672 + 2613 =S
4138 + 2443 =H
2082 + 1801 =E
4197 + 3524 =V
3057 + 1843 =L
3396 + 3251 =I
4622 + 5275 =A
0/14 letters found
Clue 4
Place value
The digital lock on the temple gate needs a place value code to open.
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
80
200
600
2000
600
T
80
600
40
T
80
50
10
600
20
90
6000
60
2000
900
500
5000
50
2000
600
2000
500
600
2000
200
5000
50
500
5000
T
80
40
5000
30
400
What is the value of the 8 in 23,382?T
What is the value of the 2 in 677,204?H
What is the value of the 5 in 272,652?I
What is the value of the 2 in 82,158?D
What is the value of the 5 in 25,812?A
What is the value of the 9 in 34,591?O
What is the value of the 5 in 608,512?R
What is the value of the 2 in 77,925?F
What is the value of the 9 in 425,917?B
What is the value of the 6 in 36,445?U
What is the value of the 4 in 238,541?C
What is the value of the 6 in 14,652?E
What is the value of the 6 in 85,067?N
What is the value of the 4 in 50,409?P
What is the value of the 1 in 358,518?V
What is the value of the 3 in 87,736?M
0/16 letters found
Clue 5
Two-step equations — the last clue
To figure out the total weight of gear across two teams, solve this two step equation.
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
5x + 4 = 54, x = ?
5x + 1 = 26, x = ?
3x + 3 = 15, x = ?
4x + 7 = 31, x = ?
5x + 3 = 48, x = ?
5x + 9 = 19, x = ?
2x + 5 = 27, x = ?
3x + 1 = 37, x = ?
3x + 12 = 15, x = ?
3x + 12 = 33, x = ?
5x + 1 = 41, x = ?
Step 2 — cross out the sentence with each answer
1.The villain used a grappling hook to escape, then shone a flashlight down the path.
2.The villain fired a signal flare into the sky, then shone a flashlight down the path.
3.The villain used a grappling hook to escape, then unraveled a rope coil.
4.The villain used a grappling hook to escape, then spoke into a walkie talkie.
5.The villain launched a pocket drone overhead, then unraveled a rope coil.
6.The villain launched a pocket drone overhead, then looked through binoculars.
7.The villain used a grappling hook to escape, then looked through binoculars.
8.The villain launched a pocket drone overhead, then shone a flashlight down the path.
9.The villain launched a pocket drone overhead, then struck a matchbox for light.
10.The villain swung a jungle machete through vines, then struck a matchbox for light.
11.The villain checked a map compass for directions, then struck a matchbox for light.
12.The villain swung a jungle machete through vines, then shone a flashlight down the path.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Compass Mystery
Culprit: Pathfinder Ava (Grappling Hook · Rope Coil · Taps Right Foot · Braided Red · Net Snare)
- Clue 1 (Multiplication facts (1-12)): "THE SNEAKY BANDIT DOES NOT CARRY BINOCULARS"4 × 11 = 44 (T) · 9 × 9 = 81 (R) · 7 × 4 = 28 (C) · 9 × 7 = 63 (A) · 12 × 10 = 120 (E) · 12 × 12 = 144 (S) · 7 × 2 = 14 (L) · 11 × 3 = 33 (U) · 10 × 1 = 10 (I) · 1 × 3 = 3 (D) · 11 × 1 = 11 (B) · 8 × 11 = 88 (H) · 7 × 5 = 35 (O) · 11 × 10 = 110 (Y) · 6 × 2 = 12 (N) · 11 × 11 = 121 (K)
- Clue 2 (Subtraction): "A WITNESS SAW THE BANDIT TAP THEIR RIGHT FOOT"6428 - 1383 = 5045 (A) · 6961 - 720 = 6241 (G) · 10339 - 2516 = 7823 (T) · 5027 - 2943 = 2084 (R) · 9413 - 1853 = 7560 (S) · 3395 - 132 = 3263 (N) · 10341 - 4549 = 5792 (B) · 8337 - 518 = 7819 (P) · 4530 - 2496 = 2034 (I) · 4968 - 119 = 4849 (O) · 5314 - 4222 = 1092 (H) · 5764 - 3270 = 2494 (W) · 6679 - 2455 = 4224 (D) · 8332 - 3207 = 5125 (E) · 9568 - 2235 = 7333 (F)
- Clue 3 (Addition): "THE HERO STOPPED THE VILLAIN WITH A NET SNARE"1924 + 4085 = 6009 (T) · 3646 + 3307 = 6953 (N) · 3693 + 2395 = 6088 (W) · 656 + 1465 = 2121 (D) · 1417 + 1370 = 2787 (O) · 2248 + 1102 = 3350 (R) · 3240 + 2739 = 5979 (P) · 2672 + 2613 = 5285 (S) · 4138 + 2443 = 6581 (H) · 2082 + 1801 = 3883 (E) · 4197 + 3524 = 7721 (V) · 3057 + 1843 = 4900 (L) · 3396 + 3251 = 6647 (I) · 4622 + 5275 = 9897 (A)
- Clue 4 (Place value): "THE DETECTIVE FOUND BRAIDED RED HAIR AT CAMP"What is the value of the 8 in 23,382? = 80 (T) · What is the value of the 2 in 677,204? = 200 (H) · What is the value of the 5 in 272,652? = 50 (I) · What is the value of the 2 in 82,158? = 2000 (D) · What is the value of the 5 in 25,812? = 5000 (A) · What is the value of the 9 in 34,591? = 90 (O) · What is the value of the 5 in 608,512? = 500 (R) · What is the value of the 2 in 77,925? = 20 (F) · What is the value of the 9 in 425,917? = 900 (B) · What is the value of the 6 in 36,445? = 6000 (U) · What is the value of the 4 in 238,541? = 40 (C) · What is the value of the 6 in 14,652? = 600 (E) · What is the value of the 6 in 85,067? = 60 (N) · What is the value of the 4 in 50,409? = 400 (P) · What is the value of the 1 in 358,518? = 10 (V) · What is the value of the 3 in 87,736? = 30 (M)
- Clue 5 (Two-step equations): surviving statement (box 3) → Pathfinder Ava5x + 4 = 54, x = 10 · 5x + 1 = 26, x = 5 · 3x + 3 = 15, x = 4 · 4x + 7 = 31, x = 6 · 5x + 3 = 48, x = 9 · 5x + 9 = 19, x = 2 · 2x + 5 = 27, x = 11 · 3x + 1 = 37, x = 12 · 3x + 12 = 15, x = 1 · 3x + 12 = 33, x = 7 · 5x + 1 = 41, x = 8
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Multiplication, Subtraction, Addition, Place value, Two-step equations
- Reading level
- grades 3-4
- Theme
- The Lost Compass Mystery — set in Jungle Camp Alpha
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects