Grade 7Reading: grades 7-9AdditionMultiplicationRoundingWord problemsDivision
The Case of the Sunken Sun Stone
During a midnight expedition deep inside Serpent Ridge Temple, someone sabotaged the vault and vanished with an ancient relic. The camp was left in disarray, but careful field notes and clues hold the key to unmasking the intruder.
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 Artifact | Gadget | Stance | Hat Style | Trajectory Trap |
|---|---|---|---|---|---|
| Holly Hunter | Obsidian Key | Signal Flare | Right Handed | Pith Helmet | Dart Launcher |
| Fiona Glen | Obsidian Key | Grappling Hook | Left Handed | Pith Helmet | Dart Launcher |
| Leo Rivers | Ruby Beetle | Signal Flare | Right Handed | Safari Cap | Net Trap |
| Silas Thorne | Crystal Skull | Smoke Bomb | Left Handed | Fedora | Net Trap |
| Ivy Chen | Obsidian Key | Smoke Bomb | Right Handed | Safari Cap | Dart Launcher |
| Paige Turner | Golden Compass | Sound Decoy | Right Handed | Pith Helmet | Pitfall Fallback |
| Sam Danger | Golden Compass | Flash Beacon | Left Handed | Safari Cap | Pitfall Fallback |
| Maya Lin | Ruby Beetle | Smoke Bomb | Right Handed | Safari Cap | Net Trap |
| Amelia Earhart | Golden Compass | Sound Decoy | Right Handed | Safari Cap | Net Trap |
| Jack Mercer | Crystal Skull | Grappling Hook | Right Handed | Pith Helmet | Net Trap |
| Elena Cruz | Golden Compass | Signal Flare | Right Handed | Pith Helmet | Pitfall Fallback |
| Rupert Finch | Crystal Skull | Smoke Bomb | Left Handed | Pith Helmet | Net Trap |
| Harrison Ford | Crystal Skull | Grappling Hook | Right Handed | Pith Helmet | Dart Launcher |
| Brody Vance | Golden Compass | Signal Flare | Right Handed | Fedora | Net Trap |
| Captain Sterling | Obsidian Key | Smoke Bomb | Right Handed | Pith Helmet | Net Trap |
| Jasper Cole | Ruby Beetle | Sound Decoy | Right Handed | Safari Cap | Net Trap |
| Zane Cross | Obsidian Key | Flash Beacon | Right Handed | Safari Cap | Net Trap |
| Dr Marcus Vance | Ruby Beetle | Grappling Hook | Right Handed | Pith Helmet | Net Trap |
| Victor Stone | Ruby Beetle | Signal Flare | Left Handed | Safari Cap | Pitfall Fallback |
| Clara Oswald | Jade Idol | Grappling Hook | Left Handed | Safari Cap | Net Trap |
| Professor Drake | Crystal Skull | Signal Flare | Right Handed | Safari Cap | Dart Launcher |
Clue 1
Addition
We tallied the total supply crates found near the campsite to trace where the rogue explorer fled.
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
3258
2627
7732
5034
3214
3816
3816
3887
3214
5065
5924
3214
5924
5065
2582
T
3258
8713
4834
7732
3887
8437
3816
3887
4834
2627
6403
7732
3887
4595
2582
5065
1345 + 1913 =T
2078 + 1738 =L
1556 + 3039 =C
3301 + 2623 =D
2354 + 4049 =B
5071 + 2661 =E
4222 + 4215 =F
2723 + 2311 =V
1486 + 1141 =H
1811 + 1403 =I
2506 + 1381 =A
2105 + 2729 =S
4262 + 4451 =U
2698 + 2367 =N
1034 + 1548 =O
0/15 letters found
Clue 2
Multiplication facts (1-12)
Examining the temple floor tiles, we calculated the total grid area to pinpoint the hidden latch.
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
12
84
8
3
20
T
12
70
8
48
48
48
90
3
90
88
20
1
84
T
12
84
90
70
35
8
35
48
70
8
90
49
6 × 2 =T
8 × 11 =R
8 × 6 =S
1 × 1 =G
4 × 5 =I
7 × 10 =N
1 × 3 =W
2 × 4 =E
10 × 9 =A
12 × 7 =H
7 × 7 =K
5 × 7 =D
0/12 letters found
Clue 3
Rounding
The digital sonar scanner only displays rounded distance readouts, so we estimated our depth.
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
130
5000
50
5000
50
70
300
T
130
70
700
290
290
50
2300
T
130
5000
50
70
300
2900
3700
50
200
900
T
130
5000
700
7000
50
T
130
T
130
70
700
290
Round 126 to the nearest tenT
Round 54 to the nearest tenE
Round 887 to the nearest hundredI
Round 3,694 to the nearest hundredU
Round 4,571 to the nearest thousandH
Round 266 to the nearest hundredO
Round 68 to the nearest tenR
Round 6,542 to the nearest thousandN
Round 2,872 to the nearest hundredG
Round 239 to the nearest hundredW
Round 2,318 to the nearest hundredD
Round 713 to the nearest hundredA
Round 293 to the nearest tenP
0/13 letters found
Clue 4
Word problems
We decoded the ledger notes from the camp stash to track how the stolen gear was moved.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Astrandofhairturnedupatthescene.
S
44
42
105
42
65
16
83
42
18
Expedition scout found 20 compasses yesterday and 24 more today. How many compasses in all?S
There were 132 lanterns. 27 were used up. How many lanterns are left?F
There were 71 map scrolls. 6 were used up. How many map scrolls are left?R
There were 117 rope coils. 34 were used up. How many rope coils are left?C
Expedition scout lined up 8 rows of 2 compasses. How many compasses in all?I
Expedition scout lined up 2 rows of 9 lanterns. How many lanterns in all?P
There were 82 map scrolls. 40 were used up. How many map scrolls are left?A
0/7 letters found
Clue 5
Division facts (1-12) — the last clue
Splitting the recovery rations evenly among the scouts helped us measure the journey back.
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
36 ÷ 6 = ?
120 ÷ 12 = ?
22 ÷ 11 = ?
44 ÷ 11 = ?
84 ÷ 12 = ?
24 ÷ 8 = ?
99 ÷ 11 = ?
32 ÷ 4 = ?
35 ÷ 7 = ?
132 ÷ 11 = ?
7 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain secured the crystal skull, then deployed a grappling hook.
2.The villain grabbed the ruby beetle, then set off a sound decoy.
3.The villain pocketed the jade idol, then deployed a grappling hook.
4.The villain grabbed the ruby beetle, then triggered a flash beacon.
5.The villain secured the crystal skull, then fired a signal flare.
6.The villain snatched the golden compass, then set off a sound decoy.
7.The villain snatched the golden compass, then dropped a smoke bomb.
8.The villain grabbed the ruby beetle, then deployed a grappling hook.
9.The villain pocketed the jade idol, then triggered a flash beacon.
10.The villain grabbed the ruby beetle, then fired a signal flare.
11.The villain grabbed the ruby beetle, then dropped a smoke bomb.
12.The villain pocketed the jade idol, then fired a signal flare.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Sunken Sun Stone
Culprit: Maya Lin (Ruby Beetle · Smoke Bomb · Right Handed · Safari Cap · Net Trap)
- Clue 1 (Addition): "THE VILLAIN DID NOT USE A FLASH BEACON"1345 + 1913 = 3258 (T) · 2078 + 1738 = 3816 (L) · 1556 + 3039 = 4595 (C) · 3301 + 2623 = 5924 (D) · 2354 + 4049 = 6403 (B) · 5071 + 2661 = 7732 (E) · 4222 + 4215 = 8437 (F) · 2723 + 2311 = 5034 (V) · 1486 + 1141 = 2627 (H) · 1811 + 1403 = 3214 (I) · 2506 + 1381 = 3887 (A) · 2105 + 2729 = 4834 (S) · 4262 + 4451 = 8713 (U) · 2698 + 2367 = 5065 (N) · 1034 + 1548 = 2582 (O)
- Clue 2 (Multiplication facts (1-12)): "THE WITNESS SAW A RIGHT HANDED SNEAK"6 × 2 = 12 (T) · 8 × 11 = 88 (R) · 8 × 6 = 48 (S) · 1 × 1 = 1 (G) · 4 × 5 = 20 (I) · 7 × 10 = 70 (N) · 1 × 3 = 3 (W) · 2 × 4 = 8 (E) · 10 × 9 = 90 (A) · 12 × 7 = 84 (H) · 7 × 7 = 49 (K) · 5 × 7 = 35 (D)
- Clue 3 (Rounding): "THE HERO TRAPPED THE ROGUE WITH A NET TRAP"Round 126 to the nearest ten = 130 (T) · Round 54 to the nearest ten = 50 (E) · Round 887 to the nearest hundred = 900 (I) · Round 3,694 to the nearest hundred = 3700 (U) · Round 4,571 to the nearest thousand = 5000 (H) · Round 266 to the nearest hundred = 300 (O) · Round 68 to the nearest ten = 70 (R) · Round 6,542 to the nearest thousand = 7000 (N) · Round 2,872 to the nearest hundred = 2900 (G) · Round 239 to the nearest hundred = 200 (W) · Round 2,318 to the nearest hundred = 2300 (D) · Round 713 to the nearest hundred = 700 (A) · Round 293 to the nearest ten = 290 (P)
- Clue 4 (Word problems): "SAFARI CAP"Expedition scout found 20 compasses yesterday and 24 more today. How many compasses in all? = 44 (S) · There were 132 lanterns. 27 were used up. How many lanterns are left? = 105 (F) · There were 71 map scrolls. 6 were used up. How many map scrolls are left? = 65 (R) · There were 117 rope coils. 34 were used up. How many rope coils are left? = 83 (C) · Expedition scout lined up 8 rows of 2 compasses. How many compasses in all? = 16 (I) · Expedition scout lined up 2 rows of 9 lanterns. How many lanterns in all? = 18 (P) · There were 82 map scrolls. 40 were used up. How many map scrolls are left? = 42 (A)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Maya Lin36 ÷ 6 = 6 · 120 ÷ 12 = 10 · 22 ÷ 11 = 2 · 44 ÷ 11 = 4 · 84 ÷ 12 = 7 · 24 ÷ 8 = 3 · 99 ÷ 11 = 9 · 32 ÷ 4 = 8 · 35 ÷ 7 = 5 · 132 ÷ 11 = 12 · 7 ÷ 7 = 1
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Addition, Multiplication, Rounding, Word problems, Division
- Reading level
- grades 7-9
- Theme
- The Case of the Sunken Sun Stone — set in Serpent Ridge Jungle Temple
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects