Grade 7Reading: grades 3-4AdditionSubtractionMultiplicationSkip countingDivision
The Mystery of the Crystal Monkey
A sneaky bandit stole the golden crystal monkey from the jungle camp overnight! Detective, examine the tracks and solve the clues to find out which explorer took 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 | Gear Item | Scout Tool | Dominant Hand | Hairstyle | Trap Weakness |
|---|---|---|---|---|---|
| Harper West | Crank lantern | Decodable map | Left handed | Ponytail hair | Loud whistles |
| Ruby Rhodes | Smoke bomb | Climbing boots | Left handed | Braided hair | Flashlight beams |
| Lucas Thorne | Glider wings | Decodable map | Left handed | Ponytail hair | Flashlight beams |
| Noah Finch | Glider wings | Scout drone | Right handed | Ponytail hair | Sticky mud |
| Zoe Vance | Compass watch | Decodable map | Right handed | Braided hair | Loud whistles |
| Caleb Hayes | Glider wings | Decodable map | Right handed | Spiky hair | Loud whistles |
| Ella Wilde | Compass watch | Climbing boots | Right handed | Braided hair | Sticky mud |
| Nora Drake | Smoke bomb | Climbing boots | Right handed | Spiky hair | Flashlight beams |
| Eli Cruz | Smoke bomb | Binoculars | Left handed | Ponytail hair | Flashlight beams |
| Ethan Blake | Compass watch | Climbing boots | Left handed | Spiky hair | Flashlight beams |
| Ava Chen | Glider wings | Climbing boots | Left handed | Ponytail hair | Flashlight beams |
| Leo Rivers | Crank lantern | Climbing boots | Right handed | Ponytail hair | Flashlight beams |
| Maya Brooks | Smoke bomb | Climbing boots | Left handed | Ponytail hair | Loud whistles |
| Mason Reed | Crank lantern | Climbing boots | Left handed | Ponytail hair | Flashlight beams |
| Sam Stone | Grappling hook | Decodable map | Left handed | Braided hair | Flashlight beams |
| Jack Sterling | Crank lantern | Binoculars | Right handed | Braided hair | Flashlight beams |
| Mia Torres | Smoke bomb | Climbing boots | Left handed | Spiky hair | Loud whistles |
| Ivy Mercer | Grappling hook | Climbing boots | Left handed | Ponytail hair | Flashlight beams |
| Grace Hall | Glider wings | Whistle gadget | Right handed | Spiky hair | Sticky mud |
| Chloe Park | Glider wings | Climbing boots | Right handed | Braided hair | Sticky mud |
| Oliver Vance | Crank lantern | Climbing boots | Left handed | Ponytail hair | Sticky mud |
Clue 1
Addition
You add up all the lost supply crates found along the muddy jungle path to reveal the first piece of 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.
T
7685
6069
9687
3519
8836
8529
8529
9377
8836
5520
5088
8220
9687
2825
5520
8220
T
7685
8434
9377
5162
5162
7683
5487
8836
5520
8220
8434
5514
8529
9377
5162
2825
4083 + 3602 =T
3377 + 5152 =L
1987 + 3500 =B
2041 + 3479 =N
1996 + 1523 =V
4834 + 3600 =C
3620 + 2449 =H
5074 + 2609 =Y
6339 + 3038 =A
3803 + 5033 =I
2726 + 2436 =R
5361 + 4326 =E
2287 + 3227 =U
3074 + 5146 =O
2649 + 2439 =D
1778 + 1047 =S
0/16 letters found
Clue 2
Subtraction
You subtract the broken camp gear from the main inventory list to uncover another clear 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
6394
3903
1219
4761
1726
4761
4257
1219
7920
T
6394
2451
1219
2423
T
6394
2119
2451
1219
2423
T
6394
3903
2119
4061
4298
4257
8640
2477
4061
T
6394
4502
4061
T
6394
3903
1219
2546
2119
T
6394
1219
9690 - 3296 =T
5677 - 916 =S
3497 - 1074 =F
5823 - 1321 =O
5568 - 1665 =H
11233 - 2593 =R
6496 - 4377 =A
8078 - 158 =C
6711 - 4165 =G
7335 - 3274 =N
8307 - 4009 =D
3595 - 1118 =I
8296 - 4039 =P
4665 - 2214 =L
4212 - 2993 =E
5922 - 4196 =U
0/16 letters found
Clue 3
Multiplication facts (1-12)
You count the rows of ancient stone tiles inside the ruin chamber to unlock a hidden message.
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
49
77
16
64
5
7
7
36
5
22
144
77
5
16
7
70
16
70
16
80
16
144
33
30
14
1
33
7
36
144
77
7
5
45
77
T
49
50
16
36
1
144
7 × 7 =T
7 × 10 =D
10 × 8 =Y
2 × 11 =N
8 × 2 =E
3 × 11 =F
3 × 10 =R
7 × 1 =L
8 × 8 =V
1 × 1 =M
6 × 6 =A
9 × 5 =G
2 × 7 =O
7 × 11 =H
1 × 5 =I
5 × 10 =B
12 × 12 =S
0/17 letters found
Clue 4
Skip counting
You skip count the carved stone steps leading up the pyramid temple to track the thiefs trail.
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
70
27
100
22
24
18
21
65
A
70
22
20
100
30
39
100
22
6
21
A
70
110
27
80
A
70
110
65
120
A
70
18
30
100
140
22
20
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26N
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160U
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45P
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75R
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10Y
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140W
Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50F
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130I
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
You divide the total snack rations equally among the search teams to organize the final clue sheet.
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
80 ÷ 8 = ?
77 ÷ 7 = ?
56 ÷ 7 = ?
72 ÷ 12 = ?
72 ÷ 6 = ?
24 ÷ 8 = ?
27 ÷ 3 = ?
12 ÷ 6 = ?
35 ÷ 7 = ?
6 ÷ 6 = ?
84 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain threw a smoke bomb, then laced up climbing boots.
2.The villain checked the compass watch, then launched a scout drone.
3.The villain lit up the crank lantern, then scouted with binoculars.
4.The villain swung across the canyon, then laced up climbing boots.
5.The villain lit up the crank lantern, then blew a whistle gadget.
6.The villain swung across the canyon, then scouted with binoculars.
7.The villain threw a smoke bomb, then launched a scout drone.
8.The villain soared on glider wings, then read a decodable map.
9.The villain checked the compass watch, then blew a whistle gadget.
10.The villain lit up the crank lantern, then laced up climbing boots.
11.The villain soared on glider wings, then laced up climbing boots.
12.The villain threw a smoke bomb, then read a decodable map.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Crystal Monkey
Culprit: Ivy Mercer (Grappling hook · Climbing boots · Left handed · Ponytail hair · Flashlight beams)
- Clue 1 (Addition): "THE VILLAIN DOES NOT CARRY BINOCULARS"4083 + 3602 = 7685 (T) · 3377 + 5152 = 8529 (L) · 1987 + 3500 = 5487 (B) · 2041 + 3479 = 5520 (N) · 1996 + 1523 = 3519 (V) · 4834 + 3600 = 8434 (C) · 3620 + 2449 = 6069 (H) · 5074 + 2609 = 7683 (Y) · 6339 + 3038 = 9377 (A) · 3803 + 5033 = 8836 (I) · 2726 + 2436 = 5162 (R) · 5361 + 4326 = 9687 (E) · 2287 + 3227 = 5514 (U) · 3074 + 5146 = 8220 (O) · 2649 + 2439 = 5088 (D) · 1778 + 1047 = 2825 (S)
- Clue 2 (Subtraction): "THE SUSPECT LEFT A LEFT HAND PRINT ON THE GATE"9690 - 3296 = 6394 (T) · 5677 - 916 = 4761 (S) · 3497 - 1074 = 2423 (F) · 5823 - 1321 = 4502 (O) · 5568 - 1665 = 3903 (H) · 11233 - 2593 = 8640 (R) · 6496 - 4377 = 2119 (A) · 8078 - 158 = 7920 (C) · 6711 - 4165 = 2546 (G) · 7335 - 3274 = 4061 (N) · 8307 - 4009 = 4298 (D) · 3595 - 1118 = 2477 (I) · 8296 - 4039 = 4257 (P) · 4665 - 2214 = 2451 (L) · 4212 - 2993 = 1219 (E) · 5922 - 4196 = 1726 (U)
- Clue 3 (Multiplication facts (1-12)): "THE VILLAIN SHIELDED EYES FROM FLASHLIGHT BEAMS"7 × 7 = 49 (T) · 7 × 10 = 70 (D) · 10 × 8 = 80 (Y) · 2 × 11 = 22 (N) · 8 × 2 = 16 (E) · 3 × 11 = 33 (F) · 3 × 10 = 30 (R) · 7 × 1 = 7 (L) · 8 × 8 = 64 (V) · 1 × 1 = 1 (M) · 6 × 6 = 36 (A) · 9 × 5 = 45 (G) · 2 × 7 = 14 (O) · 7 × 11 = 77 (H) · 1 × 5 = 5 (I) · 5 × 10 = 50 (B) · 12 × 12 = 144 (S)
- Clue 4 (Skip counting): "A LONG STRAND OF PONYTAIL HAIR WAS FOUND"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, ___, 24, 27 = 21 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (N) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (U) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (P) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (R) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (Y) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (W) · Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50 = 30 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (I)
- Clue 5 (Division facts (1-12)): surviving statement (box 4) → Ivy Mercer80 ÷ 8 = 10 · 77 ÷ 7 = 11 · 56 ÷ 7 = 8 · 72 ÷ 12 = 6 · 72 ÷ 6 = 12 · 24 ÷ 8 = 3 · 27 ÷ 3 = 9 · 12 ÷ 6 = 2 · 35 ÷ 7 = 5 · 6 ÷ 6 = 1 · 84 ÷ 12 = 7
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Addition, Subtraction, Multiplication, Skip counting, Division
- Reading level
- grades 3-4
- Theme
- The Mystery of the Crystal Monkey — set in Whispering Jungle Ruins
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects