Grade 8Reading: grades 7-9AdditionMultiplicationRoundingWord problemsDivision
The Lost Sapphire of Temple Peak
During a midnight storm, someone broke into the Sunken Citadel vault and snatched the ancient Star Sapphire. Detective, review the field reports from the expedition camp to unmask the culprit!
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 | Exploration Tool | Artifact Stolen | Dominant Hand | Headwear | Phobia |
|---|---|---|---|---|---|
| Scholar Ezra | Bronze Compass | Crystal Skull | Left Handed | Feathered Band | Spiders |
| Guide Iris | Signal Flare | Golden Idol | Right Handed | Feathered Band | Spiders |
| Ranger Blake | Signal Flare | Ruby Crown | Right Handed | Leather Cap | Spiders |
| Tracker Hayes | Grappling Hook | Ruby Crown | Right Handed | Feathered Band | Darkness |
| Recruit Skye | Signal Flare | Golden Idol | Right Handed | Feathered Band | Darkness |
| Agent Paige | Signal Flare | Crystal Skull | Left Handed | Feathered Band | Darkness |
| Navigator Tess | Signal Flare | Crystal Skull | Right Handed | Pith Helmet | Darkness |
| Scout Maya | Bronze Compass | Crystal Skull | Left Handed | Pith Helmet | Heights |
| Diver Kane | Grappling Hook | Crystal Skull | Right Handed | Feathered Band | Darkness |
| Surveyor Lark | Decoder Ring | Jade Tablet | Right Handed | Feathered Band | Darkness |
| Cadet Rowan | Decoder Ring | Golden Idol | Left Handed | Pith Helmet | Heights |
| Archivist Cole | Bronze Compass | Ruby Crown | Right Handed | Feathered Band | Heights |
| Curator Fenn | Signal Flare | Golden Idol | Right Handed | Leather Cap | Darkness |
| Professor Sterling | Signal Flare | Jade Tablet | Right Handed | Leather Cap | Darkness |
| Expert Quinn | Climbing Pick | Silver Chalice | Right Handed | Feathered Band | Spiders |
| Dr Aris Thorne | Bronze Compass | Silver Chalice | Right Handed | Pith Helmet | Darkness |
| Cartographer Milo | Grappling Hook | Silver Chalice | Right Handed | Feathered Band | Darkness |
| Archaeologist Gemma | Grappling Hook | Silver Chalice | Right Handed | Feathered Band | Spiders |
| Captain Vance | Decoder Ring | Ruby Crown | Right Handed | Leather Cap | Heights |
| Specialist Bram | Signal Flare | Jade Tablet | Left Handed | Pith Helmet | Heights |
| Officer Flint | Signal Flare | Silver Chalice | Right Handed | Feathered Band | Darkness |
Clue 1
Addition
To tally the total supplies gathered by camp guards before the theft, add up these inventory counts.
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
7217
5663
4620
2330
7051
3656
9276
9244
7591
T
7217
4621
7591
4621
8881
4694
T
7217
9407
T
7217
4620
6264
3656
9407
7591
3656
9288
4620
9244
2330
5663
6264
3656
7591
2330
4620
2793 + 4424 =T
1406 + 924 =C
2883 + 4708 =I
6274 + 2970 =R
2479 + 2215 =O
1717 + 2904 =D
4580 + 2471 =U
2391 + 1265 =L
2024 + 2596 =E
2664 + 2999 =H
5167 + 4121 =V
2977 + 5904 =N
3774 + 5502 =P
4388 + 5019 =S
3177 + 3087 =A
0/15 letters found
Clue 2
Multiplication facts (1-12)
The guard commander organized field patrols into equal grid sectors. Calculate the total area searched.
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
11
21
99
33
35
33
20
99
45
T
11
42
55
66
20
20
99
42
5
55
84
54
21
T
11
21
5
132
42
99
42
54
5
35
132
T
11
144
99
T
11
1 × 11 =T
5 × 4 =P
12 × 11 =N
11 × 3 =S
5 × 11 =R
12 × 12 =L
7 × 6 =D
9 × 11 =E
9 × 6 =G
5 × 9 =C
5 × 1 =A
7 × 12 =I
7 × 3 =H
5 × 7 =U
6 × 11 =O
0/15 letters found
Clue 3
Rounding
The ancient expedition sonar scanner only displays signal readings rounded to the nearest thousand.
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
110
300
30
70
1700
30
4300
200
90
9000
30
4300
200
30
20
3000
170
T
110
1300
1700
T
110
300
30
20
4300
9000
200
230
4300
50
30
Round 113 to the nearest tenT
Round 235 to the nearest hundredK
Round 282 to the nearest hundredH
Round 4,340 to the nearest hundredA
Round 46 to the nearest tenV
Round 1,291 to the nearest hundredI
Round 32 to the nearest tenE
Round 9,076 to the nearest thousandR
Round 228 to the nearest tenC
Round 2,658 to the nearest thousandO
Round 20 to the nearest tenD
Round 172 to the nearest tenU
Round 67 to the nearest tenS
Round 1,666 to the nearest hundredN
Round 90 to the nearest tenF
0/15 letters found
Clue 4
Word problems
Camp logs describe supply shipments moving between field bases. Solve the problem to reveal a secret clue.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Astrandof hairturnedupatthescene.
F
76
108
61
9
64
108
23
108
34
B
61
N
34
There were 106 canteen flasks. 30 were used up. How many canteen flasks are left?F
Expedition ranger lined up 8 rows of 8 expedition packs. How many expedition packs in all?H
There were 40 climbing ropes. 17 were used up. How many climbing ropes are left?R
Expedition ranger found 4 map scrolls yesterday and 30 more today. How many map scrolls in all?D
Expedition ranger lined up 12 rows of 9 expedition packs. How many expedition packs in all?E
Expedition ranger lined up 3 rows of 3 expedition packs. How many expedition packs in all?T
Expedition ranger found 28 torch batteries yesterday and 33 more today. How many torch batteries in all?A
0/7 letters found
Clue 5
Division facts (1-12) — the last clue
The rescue team divided emergency rations equally among the remaining search teams.
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
12 ÷ 3 = ?
14 ÷ 2 = ?
120 ÷ 12 = ?
64 ÷ 8 = ?
36 ÷ 12 = ?
96 ÷ 8 = ?
22 ÷ 11 = ?
35 ÷ 7 = ?
5 ÷ 5 = ?
6 ÷ 1 = ?
33 ÷ 3 = ?
Step 2 — cross out the sentence with each answer
1.The villain scaled the temple wall with a climbing pick, then snatched the golden idol.
2.The villain scaled the temple wall with a climbing pick, then lifted the ruby crown.
3.The villain navigated the maze with a bronze compass, then lifted the ruby crown.
4.The villain swung across the chasm with a grappling hook, then lifted the ruby crown.
5.The villain lit the cavern with a bright signal flare, then pocketed the jade tablet.
6.The villain scaled the temple wall with a climbing pick, then grabbed the silver chalice.
7.The villain unlocked the vault with a decoder ring, then pocketed the jade tablet.
8.The villain swung across the chasm with a grappling hook, then pocketed the jade tablet.
9.The villain swung across the chasm with a grappling hook, then swiped the crystal skull.
10.The villain lit the cavern with a bright signal flare, then snatched the golden idol.
11.The villain unlocked the vault with a decoder ring, then grabbed the silver chalice.
12.The villain lit the cavern with a bright signal flare, then lifted the ruby crown.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Lost Sapphire of Temple Peak
Culprit: Diver Kane (Grappling Hook · Crystal Skull · Right Handed · Feathered Band · Darkness)
- Clue 1 (Addition): "THE CULPRIT DID NOT STEAL SILVER CHALICE"2793 + 4424 = 7217 (T) · 1406 + 924 = 2330 (C) · 2883 + 4708 = 7591 (I) · 6274 + 2970 = 9244 (R) · 2479 + 2215 = 4694 (O) · 1717 + 2904 = 4621 (D) · 4580 + 2471 = 7051 (U) · 2391 + 1265 = 3656 (L) · 2024 + 2596 = 4620 (E) · 2664 + 2999 = 5663 (H) · 5167 + 4121 = 9288 (V) · 2977 + 5904 = 8881 (N) · 3774 + 5502 = 9276 (P) · 4388 + 5019 = 9407 (S) · 3177 + 3087 = 6264 (A)
- Clue 2 (Multiplication facts (1-12)): "THE SUSPECT DROPPED A RIGHT HANDED GAUNTLET"1 × 11 = 11 (T) · 5 × 4 = 20 (P) · 12 × 11 = 132 (N) · 11 × 3 = 33 (S) · 5 × 11 = 55 (R) · 12 × 12 = 144 (L) · 7 × 6 = 42 (D) · 9 × 11 = 99 (E) · 9 × 6 = 54 (G) · 5 × 9 = 45 (C) · 5 × 1 = 5 (A) · 7 × 12 = 84 (I) · 7 × 3 = 21 (H) · 5 × 7 = 35 (U) · 6 × 11 = 66 (O)
- Clue 3 (Rounding): "THE SNEAK FREAKED OUT IN THE DARK CAVE"Round 113 to the nearest ten = 110 (T) · Round 235 to the nearest hundred = 200 (K) · Round 282 to the nearest hundred = 300 (H) · Round 4,340 to the nearest hundred = 4300 (A) · Round 46 to the nearest ten = 50 (V) · Round 1,291 to the nearest hundred = 1300 (I) · Round 32 to the nearest ten = 30 (E) · Round 9,076 to the nearest thousand = 9000 (R) · Round 228 to the nearest ten = 230 (C) · Round 2,658 to the nearest thousand = 3000 (O) · Round 20 to the nearest ten = 20 (D) · Round 172 to the nearest ten = 170 (U) · Round 67 to the nearest ten = 70 (S) · Round 1,666 to the nearest hundred = 1700 (N) · Round 90 to the nearest ten = 90 (F)
- Clue 4 (Word problems): "FEATHERED BAND"There were 106 canteen flasks. 30 were used up. How many canteen flasks are left? = 76 (F) · Expedition ranger lined up 8 rows of 8 expedition packs. How many expedition packs in all? = 64 (H) · There were 40 climbing ropes. 17 were used up. How many climbing ropes are left? = 23 (R) · Expedition ranger found 4 map scrolls yesterday and 30 more today. How many map scrolls in all? = 34 (D) · Expedition ranger lined up 12 rows of 9 expedition packs. How many expedition packs in all? = 108 (E) · Expedition ranger lined up 3 rows of 3 expedition packs. How many expedition packs in all? = 9 (T) · Expedition ranger found 28 torch batteries yesterday and 33 more today. How many torch batteries in all? = 61 (A)
- Clue 5 (Division facts (1-12)): surviving statement (box 9) → Diver Kane12 ÷ 3 = 4 · 14 ÷ 2 = 7 · 120 ÷ 12 = 10 · 64 ÷ 8 = 8 · 36 ÷ 12 = 3 · 96 ÷ 8 = 12 · 22 ÷ 11 = 2 · 35 ÷ 7 = 5 · 5 ÷ 5 = 1 · 6 ÷ 1 = 6 · 33 ÷ 3 = 11
About this mystery
- Grade level
- Grade 8 math
- Math topics
- Addition, Multiplication, Rounding, Word problems, Division
- Reading level
- grades 7-9
- Theme
- The Lost Sapphire of Temple Peak — set in The Sunken Citadel of Oakhaven
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects