Grade 3Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Lost Idol of Mist Valley
Someone snuck into the temple campsite and swapped the golden idol with a fake rock! Use math to crack the clues and find 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 | Primary Tool | Special Gear | Glove Hand | Hat Feather | Distraction |
|---|---|---|---|---|---|
| Officer Owen | Torch | Glider Wings | Right Yellow Glove | Green Feather | Bright Lantern |
| Explorer Eli | Climbing Rope | Glider Wings | Left Yellow Glove | Green Feather | Loud Whistle |
| Captain Carlos | Binoculars | Decoy Horn | Right Yellow Glove | Blue Feather | Squeaky Parrot |
| Sailor Sam | Binoculars | Smoke Bombs | Right Yellow Glove | Blue Feather | Squeaky Parrot |
| Deputy Daisy | Torch | Decoy Horn | Right Yellow Glove | Blue Feather | Loud Whistle |
| Scout Maya | Binoculars | Smoke Bombs | Right Yellow Glove | Green Feather | Squeaky Parrot |
| Guide Gabe | Map Scroll | Glider Wings | Right Yellow Glove | Red Feather | Squeaky Parrot |
| Warden Will | Binoculars | Decoy Horn | Right Yellow Glove | Blue Feather | Loud Whistle |
| Racer Rita | Torch | Smoke Bombs | Left Yellow Glove | Blue Feather | Bright Lantern |
| Scout Samira | Machete | Grappling Hook | Right Yellow Glove | Red Feather | Loud Whistle |
| Cadet Chloe | Map Scroll | Glider Wings | Right Yellow Glove | Blue Feather | Loud Whistle |
| Pilot Penny | Torch | Tracking Compass | Right Yellow Glove | Red Feather | Loud Whistle |
| Ranger Rick | Binoculars | Grappling Hook | Right Yellow Glove | Blue Feather | Loud Whistle |
| Doc Dan | Torch | Tracking Compass | Right Yellow Glove | Blue Feather | Loud Whistle |
| Detective Nora | Climbing Rope | Grappling Hook | Left Yellow Glove | Blue Feather | Loud Whistle |
| Marshal Mark | Climbing Rope | Glider Wings | Right Yellow Glove | Red Feather | Squeaky Parrot |
| Navigator Ned | Machete | Tracking Compass | Left Yellow Glove | Green Feather | Loud Whistle |
| Explorer Elena | Binoculars | Tracking Compass | Right Yellow Glove | Green Feather | Loud Whistle |
| Agent Amy | Torch | Decoy Horn | Right Yellow Glove | Red Feather | Loud Whistle |
| Tracker Tess | Map Scroll | Smoke Bombs | Right Yellow Glove | Green Feather | Bright Lantern |
| Guard Ben | Binoculars | Smoke Bombs | Right Yellow Glove | Red Feather | Loud Whistle |
Clue 1
Rounding
The ancient temple scanner only displays rounded numbers on the stone screen.
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
4000
70
40
600
2000
400
400
30
2000
60
800
90
40
5000
60
90
T
4000
70
30
600
40
9000
400
2000
800
40
3000
20
2000
60
9000
5000
Round 4,314 to the nearest thousandT
Round 1,767 to the nearest thousandI
Round 3,235 to the nearest thousandR
Round 42 to the nearest tenE
Round 93 to the nearest tenO
Round 16 to the nearest tenW
Round 407 to the nearest hundredL
Round 58 to the nearest tenN
Round 765 to the nearest hundredD
Round 8,936 to the nearest thousandG
Round 595 to the nearest hundredV
Round 5,168 to the nearest thousandS
Round 27 to the nearest tenA
Round 71 to the nearest tenH
0/14 letters found
Clue 2
Addition
The camp leader tallying all the extra supplies found another clue written on a crate.
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
809
509
900
410
506
949
929
929
929
A
809
509
A
809
350
949
754
754
542
509
370
754
542
852
949
542
506
410
536
949
254
900
370
536
410
536
A
809
506
414
547 + 262 =A
147 + 223 =G
294 + 212 =N
258 + 156 =D
198 + 311 =W
167 + 369 =H
389 + 511 =I
486 + 268 =L
145 + 109 =R
210 + 140 =Y
450 + 499 =E
342 + 587 =S
149 + 261 =T
294 + 248 =O
478 + 374 =V
0/15 letters found
Clue 3
Subtraction
After subtracting the damaged coins from the chest a secret message appeared.
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
749
233
597
656
421
467
293
T
749
590
597
146
328
597
328
T
749
233
597
444
467
590
590
436
322
T
749
233
426
292
467
293
328
436
233
322
656
T
749
292
597
780 - 31 =T
573 - 340 =H
487 - 51 =W
625 - 35 =F
666 - 344 =I
613 - 285 =D
682 - 389 =U
510 - 43 =O
526 - 82 =M
602 - 176 =A
879 - 223 =S
635 - 214 =C
582 - 290 =L
899 - 302 =E
369 - 223 =N
0/15 letters found
Clue 4
Multiplication facts (1-12)
A grid of carved tiles on the altar revealed a pattern in equal rows.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
E
36
100
77
28
E
36
49
7
E
36
84
15
144
7
E
36
49
E
36
144
44
5
20
144
84
80
90
1
E
36
99
E
36
84
15
44
E
36
30
9 × 4 =E
7 × 4 =D
3 × 10 =R
8 × 10 =B
12 × 12 =S
5 × 1 =O
11 × 7 =I
9 × 11 =F
10 × 10 =V
7 × 12 =A
7 × 7 =N
1 × 7 =C
4 × 11 =H
10 × 9 =L
1 × 1 =U
2 × 10 =W
3 × 5 =T
0/17 letters found
Clue 5
Division facts (1-12) — the last clue
Sharing the food rations evenly among the scouts uncovered the final secret note.
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
54 ÷ 9 = ?
64 ÷ 8 = ?
120 ÷ 10 = ?
14 ÷ 7 = ?
56 ÷ 8 = ?
44 ÷ 4 = ?
45 ÷ 9 = ?
100 ÷ 10 = ?
20 ÷ 5 = ?
4 ÷ 4 = ?
54 ÷ 6 = ?
Step 2 — cross out the sentence with each answer
1.The villain lit up the dark cavern with a bright torch, then zipped across the canyon with a grappling hook.
2.The villain cleared thick vines with a machete, then confused the guard dogs with a decoy horn.
3.The villain spied on the camp with binoculars, then confused the guard dogs with a decoy horn.
4.The villain checked the hidden paths on a map scroll, then escaped into the mist using smoke bombs.
5.The villain scaled the stone temple wall with a climbing rope, then navigated the maze with a tracking compass.
6.The villain lit up the dark cavern with a bright torch, then navigated the maze with a tracking compass.
7.The villain spied on the camp with binoculars, then escaped into the mist using smoke bombs.
8.The villain spied on the camp with binoculars, then zipped across the canyon with a grappling hook.
9.The villain cleared thick vines with a machete, then soared over the treetops with glider wings.
10.The villain scaled the stone temple wall with a climbing rope, then escaped into the mist using smoke bombs.
11.The villain checked the hidden paths on a map scroll, then navigated the maze with a tracking compass.
12.The villain lit up the dark cavern with a bright torch, then confused the guard dogs with a decoy horn.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Idol of Mist Valley
Culprit: Warden Will (Binoculars · Decoy Horn · Right Yellow Glove · Blue Feather · Loud Whistle)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT HAVE GLIDER WINGS"Round 4,314 to the nearest thousand = 4000 (T) · Round 1,767 to the nearest thousand = 2000 (I) · Round 3,235 to the nearest thousand = 3000 (R) · Round 42 to the nearest ten = 40 (E) · Round 93 to the nearest ten = 90 (O) · Round 16 to the nearest ten = 20 (W) · Round 407 to the nearest hundred = 400 (L) · Round 58 to the nearest ten = 60 (N) · Round 765 to the nearest hundred = 800 (D) · Round 8,936 to the nearest thousand = 9000 (G) · Round 595 to the nearest hundred = 600 (V) · Round 5,168 to the nearest thousand = 5000 (S) · Round 27 to the nearest ten = 30 (A) · Round 71 to the nearest ten = 70 (H)
- Clue 2 (Addition): "A WITNESS SAW A YELLOW GLOVE ON THE RIGHT HAND"547 + 262 = 809 (A) · 147 + 223 = 370 (G) · 294 + 212 = 506 (N) · 258 + 156 = 414 (D) · 198 + 311 = 509 (W) · 167 + 369 = 536 (H) · 389 + 511 = 900 (I) · 486 + 268 = 754 (L) · 145 + 109 = 254 (R) · 210 + 140 = 350 (Y) · 450 + 499 = 949 (E) · 342 + 587 = 929 (S) · 149 + 261 = 410 (T) · 294 + 248 = 542 (O) · 478 + 374 = 852 (V)
- Clue 3 (Subtraction): "THE SCOUT FENDED THEM OFF WITH A LOUD WHISTLE"780 - 31 = 749 (T) · 573 - 340 = 233 (H) · 487 - 51 = 436 (W) · 625 - 35 = 590 (F) · 666 - 344 = 322 (I) · 613 - 285 = 328 (D) · 682 - 389 = 293 (U) · 510 - 43 = 467 (O) · 526 - 82 = 444 (M) · 602 - 176 = 426 (A) · 879 - 223 = 656 (S) · 635 - 214 = 421 (C) · 582 - 290 = 292 (L) · 899 - 302 = 597 (E) · 369 - 223 = 146 (N)
- Clue 4 (Multiplication facts (1-12)): "EVIDENCE AT SCENE SHOWS A BLUE FEATHER"9 × 4 = 36 (E) · 7 × 4 = 28 (D) · 3 × 10 = 30 (R) · 8 × 10 = 80 (B) · 12 × 12 = 144 (S) · 5 × 1 = 5 (O) · 11 × 7 = 77 (I) · 9 × 11 = 99 (F) · 10 × 10 = 100 (V) · 7 × 12 = 84 (A) · 7 × 7 = 49 (N) · 1 × 7 = 7 (C) · 4 × 11 = 44 (H) · 10 × 9 = 90 (L) · 1 × 1 = 1 (U) · 2 × 10 = 20 (W) · 3 × 5 = 15 (T)
- Clue 5 (Division facts (1-12)): surviving statement (box 3) → Warden Will54 ÷ 9 = 6 · 64 ÷ 8 = 8 · 120 ÷ 10 = 12 · 14 ÷ 7 = 2 · 56 ÷ 8 = 7 · 44 ÷ 4 = 11 · 45 ÷ 9 = 5 · 100 ÷ 10 = 10 · 20 ÷ 5 = 4 · 4 ÷ 4 = 1 · 54 ÷ 6 = 9
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Lost Idol of Mist Valley — set in Mist Valley Temple
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects