Grade 4Reading: grades 3-4AdditionRoundingSubtractionMultiplicationDivision
The Case of the Missing Ruby Idol
The golden monkey temple was quiet until the famous Ruby Idol vanished from its stone pedestal! Deep jungle tracks lead in every direction. Our detective team must track down the Temple Thief 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 | Temple Gear | Secret Gadget | Compass Wrist | Bandana Color | Jungle Trap |
|---|---|---|---|---|---|
| Lily Trail | Torch | Stun Net | Right Wrist | Green Bandana | Snare Loop |
| Leo Ranger | Grappling Hook | Night Goggles | Left Wrist | Red Bandana | Banana Peel |
| Noah North | Binoculars | Stun Net | Right Wrist | Blue Bandana | Banana Peel |
| Cole Cave | Grappling Hook | Stun Net | Left Wrist | Red Bandana | Mud Pit |
| Mia Moss | Binoculars | Decoy Whistle | Left Wrist | Red Bandana | Mud Pit |
| Max Map | Map Scroll | Stun Net | Right Wrist | Red Bandana | Snare Loop |
| Clara Cruz | Map Scroll | Decoy Whistle | Left Wrist | Red Bandana | Mud Pit |
| Felix Vine | Map Scroll | Flashlight | Left Wrist | Blue Bandana | Snare Loop |
| Luke Leaf | Binoculars | Stun Net | Left Wrist | Blue Bandana | Snare Loop |
| Zoe Zen | Binoculars | Night Goggles | Left Wrist | Blue Bandana | Mud Pit |
| Ruby Ridge | Binoculars | Night Goggles | Right Wrist | Blue Bandana | Banana Peel |
| Ben Boots | Machete | Flashlight | Left Wrist | Red Bandana | Mud Pit |
| Ethan Explorer | Machete | Night Goggles | Right Wrist | Red Bandana | Mud Pit |
| Chloe Camp | Machete | Stun Net | Left Wrist | Green Bandana | Snare Loop |
| Nora River | Binoculars | Flashlight | Left Wrist | Red Bandana | Banana Peel |
| Ivy Isle | Torch | Night Goggles | Right Wrist | Green Bandana | Banana Peel |
| Ella Echo | Machete | Flashlight | Right Wrist | Green Bandana | Mud Pit |
| Maya Woods | Grappling Hook | Decoy Whistle | Left Wrist | Red Bandana | Mud Pit |
| Sam Tracker | Grappling Hook | Decoy Whistle | Right Wrist | Red Bandana | Banana Peel |
| Indy Scout | Torch | Stun Net | Right Wrist | Red Bandana | Mud Pit |
| Owen Outpost | Map Scroll | Stun Net | Left Wrist | Red Bandana | Banana Peel |
Clue 1
Addition
We counted all the coconut canteens collected from both base camps to find our 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
6359
4174
5809
T
6359
4174
8268
5809
7705
9705
8268
9705
2482
5985
T
6359
6624
6160
5809
7292
7705
2715
7292
6160
4174
2715
8268
9444
4174
T
6359
3648 + 2711 =T
2344 + 4948 =A
4450 + 2174 =U
5286 + 2419 =F
3170 + 2639 =E
6422 + 3022 =G
847 + 1868 =L
4231 + 1929 =S
757 + 1725 =N
2236 + 1938 =H
3171 + 6534 =D
2928 + 5340 =I
3968 + 2017 =O
0/13 letters found
Clue 2
Rounding
The ancient temple door scanner rounded our total step count to the nearest hundred.
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
170
130
2000
370
430
2300
2300
2300
30
W
170
30
3000
4300
1300
3700
30
2300
2300
4300
370
2000
2900
430
9000
430
500
2000
W
170
20
130
2300
2000
Round 171 to the nearest tenW
Round 16 to the nearest tenR
Round 496 to the nearest hundredF
Round 374 to the nearest tenN
Round 29 to the nearest tenA
Round 426 to the nearest tenE
Round 130 to the nearest tenI
Round 2,681 to the nearest thousandC
Round 1,601 to the nearest thousandT
Round 2,293 to the nearest hundredS
Round 4,291 to the nearest hundredO
Round 1,290 to the nearest hundredM
Round 3,722 to the nearest hundredP
Round 2,889 to the nearest hundredH
Round 8,529 to the nearest thousandL
0/15 letters found
Clue 3
Subtraction
We subtracted the used torch logs from the total pile to see what was stolen.
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
6402
3123
6009
7922
6713
7922
1202
6009
3163
T
6402
8715
7085
T
6402
7922
T
6402
6713
3163
7083
2328
3608
7779
1116
6713
1237
1202
2328
T
6402
T
6402
7943
7779
1202
8780 - 2378 =T
5121 - 4005 =M
10277 - 2334 =R
8053 - 4445 =N
9133 - 418 =G
6604 - 4276 =I
11142 - 4059 =K
10694 - 2915 =A
7052 - 339 =U
3882 - 2680 =P
7762 - 4639 =H
10732 - 4723 =E
11651 - 3729 =S
11830 - 4745 =O
6304 - 3141 =C
1910 - 673 =D
0/16 letters found
Clue 4
Multiplication facts (1-12)
We checked four wooden crates that each held six brass coins to read the note inside.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
R
11
12
99
16
108
72
R
11
80
66
33
108
100
18
108
60
45
1
12
99
80
60
18
42
12
72
25
100
42
12
100
11 × 1 =R
8 × 2 =F
1 × 1 =L
11 × 9 =D
5 × 5 =U
8 × 10 =I
6 × 10 =N
4 × 3 =E
9 × 8 =B
11 × 6 =C
6 × 7 =H
5 × 9 =G
12 × 9 =A
3 × 11 =W
9 × 2 =T
10 × 10 =S
0/16 letters found
Clue 5
Division facts (1-12) — the last clue
We shared twenty trail bars equally among five scout teams to unlock the secret code.
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
18 ÷ 9 = ?
12 ÷ 1 = ?
90 ÷ 9 = ?
49 ÷ 7 = ?
24 ÷ 6 = ?
72 ÷ 8 = ?
11 ÷ 1 = ?
8 ÷ 8 = ?
45 ÷ 9 = ?
18 ÷ 3 = ?
48 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain lit up the dark cave with a torch, then escaped into thick fog with a smoke bomb.
2.The villain spied on the camp with binoculars, then tricked the guards using a decoy whistle.
3.The villain swung across the pit with a grappling hook, then tricked the guards using a decoy whistle.
4.The villain swung across the pit with a grappling hook, then guided the way using a flashlight.
5.The villain marked the path using a map scroll, then trapped the guard dog with a stun net.
6.The villain hacked through vines with a machete, then escaped into thick fog with a smoke bomb.
7.The villain swung across the pit with a grappling hook, then escaped into thick fog with a smoke bomb.
8.The villain spied on the camp with binoculars, then crept past bats with night goggles.
9.The villain marked the path using a map scroll, then crept past bats with night goggles.
10.The villain swung across the pit with a grappling hook, then trapped the guard dog with a stun net.
11.The villain marked the path using a map scroll, then escaped into thick fog with a smoke bomb.
12.The villain marked the path using a map scroll, then tricked the guards using a decoy whistle.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Ruby Idol
Culprit: Maya Woods (Grappling Hook · Decoy Whistle · Left Wrist · Red Bandana · Mud Pit)
- Clue 1 (Addition): "THE THIEF DID NOT USE A FLASHLIGHT"3648 + 2711 = 6359 (T) · 2344 + 4948 = 7292 (A) · 4450 + 2174 = 6624 (U) · 5286 + 2419 = 7705 (F) · 3170 + 2639 = 5809 (E) · 6422 + 3022 = 9444 (G) · 847 + 1868 = 2715 (L) · 4231 + 1929 = 6160 (S) · 757 + 1725 = 2482 (N) · 2236 + 1938 = 4174 (H) · 3171 + 6534 = 9705 (D) · 2928 + 5340 = 8268 (I) · 3968 + 2017 = 5985 (O)
- Clue 2 (Rounding): "WITNESS SAW A COMPASS ON THE LEFT WRIST"Round 171 to the nearest ten = 170 (W) · Round 16 to the nearest ten = 20 (R) · Round 496 to the nearest hundred = 500 (F) · Round 374 to the nearest ten = 370 (N) · Round 29 to the nearest ten = 30 (A) · Round 426 to the nearest ten = 430 (E) · Round 130 to the nearest ten = 130 (I) · Round 2,681 to the nearest thousand = 3000 (C) · Round 1,601 to the nearest thousand = 2000 (T) · Round 2,293 to the nearest hundred = 2300 (S) · Round 4,291 to the nearest hundred = 4300 (O) · Round 1,290 to the nearest hundred = 1300 (M) · Round 3,722 to the nearest hundred = 3700 (P) · Round 2,889 to the nearest hundred = 2900 (H) · Round 8,529 to the nearest thousand = 9000 (L)
- Clue 3 (Subtraction): "THE SUSPECT GOT STUCK IN A MUD PIT TRAP"8780 - 2378 = 6402 (T) · 5121 - 4005 = 1116 (M) · 10277 - 2334 = 7943 (R) · 8053 - 4445 = 3608 (N) · 9133 - 418 = 8715 (G) · 6604 - 4276 = 2328 (I) · 11142 - 4059 = 7083 (K) · 10694 - 2915 = 7779 (A) · 7052 - 339 = 6713 (U) · 3882 - 2680 = 1202 (P) · 7762 - 4639 = 3123 (H) · 10732 - 4723 = 6009 (E) · 11651 - 3729 = 7922 (S) · 11830 - 4745 = 7085 (O) · 6304 - 3141 = 3163 (C) · 1910 - 673 = 1237 (D)
- Clue 4 (Multiplication facts (1-12)): "RED FABRIC WAS TANGLED IN THE BUSHES"11 × 1 = 11 (R) · 8 × 2 = 16 (F) · 1 × 1 = 1 (L) · 11 × 9 = 99 (D) · 5 × 5 = 25 (U) · 8 × 10 = 80 (I) · 6 × 10 = 60 (N) · 4 × 3 = 12 (E) · 9 × 8 = 72 (B) · 11 × 6 = 66 (C) · 6 × 7 = 42 (H) · 5 × 9 = 45 (G) · 12 × 9 = 108 (A) · 3 × 11 = 33 (W) · 9 × 2 = 18 (T) · 10 × 10 = 100 (S)
- Clue 5 (Division facts (1-12)): surviving statement (box 3) → Maya Woods18 ÷ 9 = 2 · 12 ÷ 1 = 12 · 90 ÷ 9 = 10 · 49 ÷ 7 = 7 · 24 ÷ 6 = 4 · 72 ÷ 8 = 9 · 11 ÷ 1 = 11 · 8 ÷ 8 = 1 · 45 ÷ 9 = 5 · 18 ÷ 3 = 6 · 48 ÷ 6 = 8
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Addition, Rounding, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Ruby Idol — set in Golden Monkey Temple Deep in the Jungle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects