Grade 6Reading: grades 1-2Fractions of a numberPercentagesExponentsOrder of operations
The Great Treehouse Mystery
Someone took the Golden Acorn from the Treehouse Kingdom! The chief ranger needs your help to search the high branches and find the sneaky bandit before sunset.
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 | Favorite Gear | Badge Earned | Writing Hand | Cap Color | Fear |
|---|---|---|---|---|---|
| Mia | laser flashlight | zipline flyer | writes right handed | sky blue cap | scared of the dark |
| Sam | laser flashlight | map reader | writes left handed | sky blue cap | scared of spiders |
| Amy | climbing rope | bridge builder | writes right handed | sky blue cap | scared of spiders |
| Roy | magnifying glass | star gazer | writes right handed | bright red cap | scared of the dark |
| Ida | climbing rope | camp cooker | writes left handed | bright red cap | scared of the dark |
| Ted | climbing rope | zipline flyer | writes left handed | bright red cap | scared of heights |
| Liz | climbing rope | bridge builder | writes right handed | leaf green cap | scared of spiders |
| Eli | climbing rope | star gazer | writes right handed | sky blue cap | scared of the dark |
| Fay | grappling hook | bridge builder | writes right handed | bright red cap | scared of heights |
| Tom | laser flashlight | zipline flyer | writes left handed | leaf green cap | scared of the dark |
| Zoe | climbing rope | zipline flyer | writes right handed | leaf green cap | scared of the dark |
| Ava | pocket compass | zipline flyer | writes right handed | bright red cap | scared of spiders |
| Ken | magnifying glass | star gazer | writes right handed | sky blue cap | scared of spiders |
| Max | pocket compass | star gazer | writes right handed | sky blue cap | scared of spiders |
| Ben | laser flashlight | camp cooker | writes right handed | sky blue cap | scared of spiders |
| Dan | pocket compass | star gazer | writes left handed | sky blue cap | scared of spiders |
| Joy | climbing rope | map reader | writes left handed | bright red cap | scared of spiders |
| Meg | grappling hook | star gazer | writes right handed | leaf green cap | scared of heights |
| Ned | grappling hook | zipline flyer | writes right handed | leaf green cap | scared of spiders |
| Abe | climbing rope | bridge builder | writes right handed | leaf green cap | scared of heights |
| Leo | pocket compass | map reader | writes right handed | sky blue cap | scared of spiders |
Clue 1
Fractions of a number
We need to split the rescue rope. We must cut off a fraction of the long rope to help us climb down.
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
29
20
25
15
32
14
35
31
T
29
35
6
25
21
14
6
T
29
4
6
6
13
4
32
18
7
6
9
T
29
8
6
6
35
2/10 of 145 =T
2/3 of 27 =M
4/10 of 35 =N
1/4 of 140 =D
1/3 of 12 =C
1/2 of 14 =P
5/10 of 42 =S
1/5 of 155 =I
1/5 of 45 =U
1/2 of 30 =B
2/10 of 100 =H
1/4 of 52 =K
1/4 of 100 =E
2/4 of 12 =O
1/5 of 160 =A
3/6 of 16 =F
0/16 letters found
Clue 2
Percentages
Our flashlight battery is low. The screen shows the percentage of power left. Let us check it now.
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
6
39
27
3
8
5
4
18
T
6
30
21
27
21
T
6
39
27
18
10
10
18
17
39
T
6
39
8
5
4
T
6
33
19
10
18
T
6
27
10% of 60 =T
25% of 16 =D
75% of 28 =S
50% of 60 =U
20% of 90 =I
10% of 100 =R
5% of 100 =N
20% of 95 =W
5% of 660 =O
20% of 135 =E
40% of 20 =A
10% of 170 =G
10% of 30 =B
50% of 78 =H
0/14 letters found
Clue 3
Exponents
The sneaky bandit left a box. The box has rows of locked buttons. The buttons multiply in blocks.
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
289
8
400
49
343
361
64
81
T
289
196
121
324
400
343
225
196
343
T
289
T
289
81
361
256
196
216
81
64
400
324
196
17^2 =T
18^2 =R
4^3 =D
15^2 =M
14^2 =S
19^2 =N
2^3 =H
6^3 =P
7^2 =B
11^2 =C
20^2 =E
16^2 =Y
3^4 =I
7^3 =A
0/14 letters found
Clue 4
Order of operations
To unlock the secret wooden gate, we must push the buttons in the right order. Follow the steps carefully.
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
25
75
51
20
18
37
7
7
51
10
T
25
75
76
51
24
10
20
42
51
76
51
20
26
29
35
43
27
51
11 × 3 - 8 =T
10 × 3 - 10 =S
13 + 6 × 4 =I
48 + 7 × 4 =R
12 × 4 - 13 =B
6 + 2 × 2 =D
9 × 4 - 10 =K
12 + 9 × 7 =H
3 + 8 × 6 =E
7 × 4 - 21 =P
7 + 4 × 9 =L
8 × 6 - 19 =Y
4 × 7 - 10 =N
12 + 2 × 6 =A
6 × 6 - 9 =U
11 × 4 - 2 =W
0/16 letters found
Clue 5
Fractions of a number — the last clue
We found a map torn into small bits. We must count how many fractions of the map we have put back together.
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
1/2 of 10 = ?
2/6 of 9 = ?
2/10 of 45 = ?
1/5 of 10 = ?
1/2 of 14 = ?
3/8 of 16 = ?
2/4 of 2 = ?
5/10 of 8 = ?
8/10 of 15 = ?
4/8 of 22 = ?
4/6 of 15 = ?
Step 2 — cross out the sentence with each answer
1.The villain shines a laser flashlight, then points at the North Star.
2.The villain swings on a grappling hook, then builds a wooden bridge.
3.The villain climbs up a rope, then builds a wooden bridge.
4.The villain swings on a grappling hook, then rides down the zipline.
5.The villain checks a pocket compass, then points at the North Star.
6.The villain climbs up a rope, then bakes some trail mix biscuits.
7.The villain checks a pocket compass, then rides down the zipline.
8.The villain checks a pocket compass, then examines the secret map.
9.The villain uses a magnifying glass, then points at the North Star.
10.The villain shines a laser flashlight, then rides down the zipline.
11.The villain shines a laser flashlight, then bakes some trail mix biscuits.
12.The villain shines a laser flashlight, then builds a wooden bridge.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Treehouse Mystery
Culprit: Leo (pocket compass · map reader · writes right handed · sky blue cap · scared of spiders)
- Clue 1 (Fractions of a number): "THE BANDIT DOES NOT COOK CAMPOUT FOOD"2/10 of 145 = 29 (T) · 2/3 of 27 = 18 (M) · 4/10 of 35 = 14 (N) · 1/4 of 140 = 35 (D) · 1/3 of 12 = 4 (C) · 1/2 of 14 = 7 (P) · 5/10 of 42 = 21 (S) · 1/5 of 155 = 31 (I) · 1/5 of 45 = 9 (U) · 1/2 of 30 = 15 (B) · 2/10 of 100 = 20 (H) · 1/4 of 52 = 13 (K) · 1/4 of 100 = 25 (E) · 2/4 of 12 = 6 (O) · 1/5 of 160 = 32 (A) · 3/6 of 16 = 8 (F)
- Clue 2 (Percentages): "THE BANDIT USES THEIR RIGHT HAND TO WRITE"10% of 60 = 6 (T) · 25% of 16 = 4 (D) · 75% of 28 = 21 (S) · 50% of 60 = 30 (U) · 20% of 90 = 18 (I) · 10% of 100 = 10 (R) · 5% of 100 = 5 (N) · 20% of 95 = 19 (W) · 5% of 660 = 33 (O) · 20% of 135 = 27 (E) · 40% of 20 = 8 (A) · 10% of 170 = 17 (G) · 10% of 30 = 3 (B) · 50% of 78 = 39 (H)
- Clue 3 (Exponents): "THE BANDIT SCREAMS AT TINY SPIDERS"17^2 = 289 (T) · 18^2 = 324 (R) · 4^3 = 64 (D) · 15^2 = 225 (M) · 14^2 = 196 (S) · 19^2 = 361 (N) · 2^3 = 8 (H) · 6^3 = 216 (P) · 7^2 = 49 (B) · 11^2 = 121 (C) · 20^2 = 400 (E) · 16^2 = 256 (Y) · 3^4 = 81 (I) · 7^3 = 343 (A)
- Clue 4 (Order of operations): "THE SNIPPED THREADS WERE SKY BLUE"11 × 3 - 8 = 25 (T) · 10 × 3 - 10 = 20 (S) · 13 + 6 × 4 = 37 (I) · 48 + 7 × 4 = 76 (R) · 12 × 4 - 13 = 35 (B) · 6 + 2 × 2 = 10 (D) · 9 × 4 - 10 = 26 (K) · 12 + 9 × 7 = 75 (H) · 3 + 8 × 6 = 51 (E) · 7 × 4 - 21 = 7 (P) · 7 + 4 × 9 = 43 (L) · 8 × 6 - 19 = 29 (Y) · 4 × 7 - 10 = 18 (N) · 12 + 2 × 6 = 24 (A) · 6 × 6 - 9 = 27 (U) · 11 × 4 - 2 = 42 (W)
- Clue 5 (Fractions of a number): surviving statement (box 8) → Leo1/2 of 10 = 5 · 2/6 of 9 = 3 · 2/10 of 45 = 9 · 1/5 of 10 = 2 · 1/2 of 14 = 7 · 3/8 of 16 = 6 · 2/4 of 2 = 1 · 5/10 of 8 = 4 · 8/10 of 15 = 12 · 4/8 of 22 = 11 · 4/6 of 15 = 10
About this mystery
- Grade level
- Grade 6 math
- Math topics
- Fractions of a number, Percentages, Exponents, Order of operations
- Reading level
- grades 1-2
- Theme
- The Great Treehouse Mystery — set in The Treehouse Kingdom
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects