Grade 6Reading: grades 5-6Fractions of a numberRoundingPercentagesExponents
The Mystery of the Sunken Sun Stone
Someone stole the Golden Sun Stone from Professor Drake's campsite in the middle of Serpent Island. Solve the clues to reveal the culprit before the escape boat sails away.
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 | Expedition Tool | Explorer Gear | Camp Habit | Hat Style | Jungle Fear |
|---|---|---|---|---|---|
| Jax Mercer | Machete | Snake Boots | Taps Right Boot | Safari Cap | Mosquito Swarms |
| Koa Rivers | Compass Watch | Brass Telescope | Taps Right Boot | Pith Helmet | Quick Sand |
| Felix Vance | Grappling Hook | Leather Canteen | Taps Right Boot | Felt Fedora | Mosquito Swarms |
| Aria Finch | Signal Flare | Climbing Harness | Taps Left Boot | Felt Fedora | Mosquito Swarms |
| Maya Cruz | Signal Flare | Leather Canteen | Taps Right Boot | Safari Cap | Mosquito Swarms |
| Gavin Stone | Compass Watch | Brass Telescope | Taps Right Boot | Safari Cap | Mosquito Swarms |
| Mateo Silva | Signal Flare | Snake Boots | Taps Right Boot | Felt Fedora | Quick Sand |
| Caleb Thorne | Machete | Map Pouch | Taps Right Boot | Pith Helmet | Mosquito Swarms |
| Jasper Drake | Torch Flashlight | Map Pouch | Taps Right Boot | Felt Fedora | Mosquito Swarms |
| Ivy Holbrook | Torch Flashlight | Snake Boots | Taps Left Boot | Felt Fedora | Mosquito Swarms |
| Chloe Bennett | Torch Flashlight | Leather Canteen | Taps Right Boot | Felt Fedora | Mosquito Swarms |
| Wyatt Steele | Compass Watch | Leather Canteen | Taps Left Boot | Pith Helmet | Mud Pits |
| Isla Barrett | Machete | Leather Canteen | Taps Left Boot | Pith Helmet | Mosquito Swarms |
| Leo Vance | Compass Watch | Brass Telescope | Taps Left Boot | Felt Fedora | Quick Sand |
| Elena Frost | Compass Watch | Brass Telescope | Taps Left Boot | Pith Helmet | Mud Pits |
| Nora Wilde | Machete | Climbing Harness | Taps Right Boot | Felt Fedora | Mosquito Swarms |
| Talia Reed | Grappling Hook | Snake Boots | Taps Right Boot | Pith Helmet | Mud Pits |
| Owen Hayes | Compass Watch | Brass Telescope | Taps Left Boot | Pith Helmet | Mosquito Swarms |
| Ethan Cross | Compass Watch | Climbing Harness | Taps Right Boot | Felt Fedora | Mosquito Swarms |
| Luna Marsh | Torch Flashlight | Leather Canteen | Taps Left Boot | Safari Cap | Mud Pits |
| Indiana Rex | Machete | Climbing Harness | Taps Left Boot | Felt Fedora | Mosquito Swarms |
Clue 1
Fractions of a number
We surveyed the expedition supply crates to find out what portion of the food packs were tampered with.
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
24
32
18
3
9
29
29
28
9
37
4
27
18
20
37
27
T
24
22
28
10
10
19
28
36
28
21
21
27
14
22
32
4/6 of 36 =T
4/10 of 80 =H
1/6 of 18 =V
2/6 of 111 =N
1/6 of 108 =E
1/2 of 56 =A
1/5 of 100 =S
4/10 of 10 =D
1/2 of 28 =U
3/5 of 45 =O
2/10 of 95 =Y
3/5 of 15 =I
3/8 of 96 =M
3/6 of 58 =L
5/10 of 20 =R
3/5 of 35 =P
1/4 of 88 =C
0/17 letters found
Clue 2
Rounding
The camp sonar scanner only displays terrain distances rounded to the nearest ten meters.
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
70
2900
2300
90
370
200
200
200
9000
W
70
2300
2000
370
4300
2300
9000
3700
3700
2900
90
130
2300
2000
370
2900
230
230
2900
130
2000
2300
5000
300
300
2300
Round 72 to the nearest tenW
Round 8,700 to the nearest thousandA
Round 260 to the nearest hundredO
Round 369 to the nearest tenE
Round 5,139 to the nearest thousandB
Round 92 to the nearest tenN
Round 4,322 to the nearest hundredM
Round 230 to the nearest tenR
Round 131 to the nearest tenG
Round 239 to the nearest hundredS
Round 3,744 to the nearest hundredP
Round 1,584 to the nearest thousandH
Round 2,918 to the nearest hundredI
Round 2,289 to the nearest hundredT
0/14 letters found
Clue 3
Percentages
We calculated the exact percentage of ancient symbols decoded on the altar wall.
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
2
9
38
5
36
T
2
21
6
23
38
21
33
17
38
23
33
21
7
32
42
32
7
14
34
6
5
T
2
7
14
26
42
21
32
50% of 4 =T
50% of 14 =O
50% of 46 =D
25% of 84 =R
5% of 180 =H
50% of 28 =S
40% of 80 =M
50% of 72 =N
40% of 15 =U
50% of 76 =E
60% of 70 =A
20% of 170 =Q
50% of 10 =I
50% of 52 =W
25% of 132 =F
10% of 170 =L
0/16 letters found
Clue 4
Exponents
The power grid reading showed energy growth calculated using repeated exponential factors.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
F
27
216
121
81
9
64
4
196
32
F
27
196
64
243
4
400
F
27
4
216
32
125
F
27
243
169
49
F
27
243
9
216
4
125
3^3 =F
14^2 =I
5^3 =A
2^5 =M
6^3 =O
2^2 =R
3^5 =E
7^2 =T
3^4 =N
3^2 =D
20^2 =S
11^2 =U
4^3 =B
13^2 =L
0/14 letters found
Clue 5
Fractions of a number — the last clue
We checked the fraction of mud tracks left along the riverbank trail.
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
1/6 of 66 = ?
1/6 of 48 = ?
4/10 of 30 = ?
2/8 of 20 = ?
2/6 of 3 = ?
1/6 of 36 = ?
1/3 of 27 = ?
2/6 of 21 = ?
1/4 of 12 = ?
5/6 of 12 = ?
2/8 of 8 = ?
Step 2 — cross out the sentence with each answer
1.The villain threw a grappling hook up the ledge, then laced up heavy snake boots.
2.The villain shined a torch flashlight into the cave, then laced up heavy snake boots.
3.The villain checked a compass watch for direction, then laced up heavy snake boots.
4.The villain swung a machete through vines, then clipped onto a climbing harness.
5.The villain swung a machete through vines, then stuffed maps into a map pouch.
6.The villain threw a grappling hook up the ledge, then adjusted a brass telescope.
7.The villain swung a machete through vines, then adjusted a brass telescope.
8.The villain checked a compass watch for direction, then clipped onto a climbing harness.
9.The villain swung a machete through vines, then laced up heavy snake boots.
10.The villain shined a torch flashlight into the cave, then clipped onto a climbing harness.
11.The villain threw a grappling hook up the ledge, then took a drink from a leather canteen.
12.The villain shined a torch flashlight into the cave, then took a drink from a leather canteen.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Sunken Sun Stone
Culprit: Nora Wilde (Machete · Climbing Harness · Taps Right Boot · Felt Fedora · Mosquito Swarms)
- Clue 1 (Fractions of a number): "THE VILLAIN DOES NOT CARRY A MAP POUCH"4/6 of 36 = 24 (T) · 4/10 of 80 = 32 (H) · 1/6 of 18 = 3 (V) · 2/6 of 111 = 37 (N) · 1/6 of 108 = 18 (E) · 1/2 of 56 = 28 (A) · 1/5 of 100 = 20 (S) · 4/10 of 10 = 4 (D) · 1/2 of 28 = 14 (U) · 3/5 of 45 = 27 (O) · 2/10 of 95 = 19 (Y) · 3/5 of 15 = 9 (I) · 3/8 of 96 = 36 (M) · 3/6 of 58 = 29 (L) · 5/10 of 20 = 10 (R) · 3/5 of 35 = 21 (P) · 1/4 of 88 = 22 (C)
- Clue 2 (Rounding): "WITNESS SAW THEM TAPPING THEIR RIGHT BOOT"Round 72 to the nearest ten = 70 (W) · Round 8,700 to the nearest thousand = 9000 (A) · Round 260 to the nearest hundred = 300 (O) · Round 369 to the nearest ten = 370 (E) · Round 5,139 to the nearest thousand = 5000 (B) · Round 92 to the nearest ten = 90 (N) · Round 4,322 to the nearest hundred = 4300 (M) · Round 230 to the nearest ten = 230 (R) · Round 131 to the nearest ten = 130 (G) · Round 239 to the nearest hundred = 200 (S) · Round 3,744 to the nearest hundred = 3700 (P) · Round 1,584 to the nearest thousand = 2000 (H) · Round 2,918 to the nearest hundred = 2900 (I) · Round 2,289 to the nearest hundred = 2300 (T)
- Clue 3 (Percentages): "THE INTRUDER FLED FROM A MOSQUITO SWARM"50% of 4 = 2 (T) · 50% of 14 = 7 (O) · 50% of 46 = 23 (D) · 25% of 84 = 21 (R) · 5% of 180 = 9 (H) · 50% of 28 = 14 (S) · 40% of 80 = 32 (M) · 50% of 72 = 36 (N) · 40% of 15 = 6 (U) · 50% of 76 = 38 (E) · 60% of 70 = 42 (A) · 20% of 170 = 34 (Q) · 50% of 10 = 5 (I) · 50% of 52 = 26 (W) · 25% of 132 = 33 (F) · 10% of 170 = 17 (L)
- Clue 4 (Exponents): "FOUND BRIM FIBERS FROM A FELT FEDORA"3^3 = 27 (F) · 14^2 = 196 (I) · 5^3 = 125 (A) · 2^5 = 32 (M) · 6^3 = 216 (O) · 2^2 = 4 (R) · 3^5 = 243 (E) · 7^2 = 49 (T) · 3^4 = 81 (N) · 3^2 = 9 (D) · 20^2 = 400 (S) · 11^2 = 121 (U) · 4^3 = 64 (B) · 13^2 = 169 (L)
- Clue 5 (Fractions of a number): surviving statement (box 4) → Nora Wilde1/6 of 66 = 11 · 1/6 of 48 = 8 · 4/10 of 30 = 12 · 2/8 of 20 = 5 · 2/6 of 3 = 1 · 1/6 of 36 = 6 · 1/3 of 27 = 9 · 2/6 of 21 = 7 · 1/4 of 12 = 3 · 5/6 of 12 = 10 · 2/8 of 8 = 2
About this mystery
- Grade level
- Grade 6 math
- Math topics
- Fractions of a number, Rounding, Percentages, Exponents
- Reading level
- grades 5-6
- Theme
- The Mystery of the Sunken Sun Stone — set in Serpent Island Jungle Ruins
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects