Grade 1Reading: grades 1-2AdditionSubtractionMultiplicationSkip countingDivision
The Treehouse Treasure Mystery
Someone snuck into the camp treehouse and took the golden compass! The campers need to solve the clues, find the villain, and save the camp treasure.
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 | Main Tool | Camp Badge | Hand Used | Cap Color | Scared By |
|---|---|---|---|---|---|
| Toby Trail | Jungle Map | Climber Badge | Left Handed | Green Cap | Squeaky Duck |
| Ian Ivy | Rope Ladder | Trail Badge | Left Handed | Red Cap | Loud Whistle |
| Piper Pine | Rope Ladder | Climber Badge | Right Handed | Red Cap | Loud Whistle |
| Penny Peak | Camp Lantern | Tracker Badge | Left Handed | Blue Cap | Loud Whistle |
| Lulu Log | Brass Spyglass | Tracker Badge | Left Handed | Red Cap | Loud Whistle |
| Daisy Birch | Camp Lantern | River Badge | Right Handed | Blue Cap | Bright Light |
| Nina Nest | Camp Lantern | Climber Badge | Left Handed | Red Cap | Loud Whistle |
| Benny Fern | Rope Ladder | Explorer Badge | Right Handed | Blue Cap | Bright Light |
| Eli Eco | Jungle Map | Trail Badge | Left Handed | Green Cap | Loud Whistle |
| Maya Moss | Camp Lantern | Climber Badge | Right Handed | Blue Cap | Loud Whistle |
| Holly Hill | Brass Spyglass | Climber Badge | Left Handed | Blue Cap | Bright Light |
| Jade Willow | Pocket Compass | Climber Badge | Left Handed | Blue Cap | Bright Light |
| Leo Leaf | Rope Ladder | River Badge | Left Handed | Red Cap | Squeaky Duck |
| Cody Creek | Rope Ladder | Trail Badge | Left Handed | Blue Cap | Loud Whistle |
| Gabe Grove | Jungle Map | Trail Badge | Right Handed | Blue Cap | Squeaky Duck |
| Kai Cedar | Camp Lantern | Trail Badge | Right Handed | Green Cap | Bright Light |
| Fiona Fox | Jungle Map | Trail Badge | Left Handed | Green Cap | Squeaky Duck |
| Zack River | Jungle Map | Explorer Badge | Right Handed | Red Cap | Squeaky Duck |
| Ruby Ridge | Rope Ladder | Tracker Badge | Right Handed | Blue Cap | Squeaky Duck |
| Milo Mud | Brass Spyglass | Trail Badge | Left Handed | Red Cap | Loud Whistle |
| Finn Forest | Rope Ladder | River Badge | Left Handed | Red Cap | Loud Whistle |
Clue 1
Addition
You count the wooden steps added to the ladder to find a hidden note.
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
19
5
T
12
19
15
5
7
6
20
5
8
16
20
T
12
19
2
11
5
2
T
12
18
2
9
17
5
18
10
2
6
3
5
6 + 6 =T
5 + 5 =B
8 + 7 =I
6 + 5 =V
9 + 11 =O
3 + 2 =E
5 + 14 =H
5 + 11 =N
10 + 8 =R
6 + 2 =S
10 + 7 =K
7 + 2 =C
2 + 4 =D
2 + 5 =F
1 + 2 =G
1 + 1 =A
0/16 letters found
Clue 2
Subtraction
You subtract the broken sticks from the pile to clear the path.
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
8
10
T
6
8
9
10
15
8
10
17
7
T
6
8
10
12
16
14
2
9
T
6
8
T
6
8
10
9
18
17
10
15
T
6
8
16
4
7
8 - 2 =T
4 - 2 =W
19 - 9 =E
18 - 3 =F
17 - 3 =P
13 - 1 =M
20 - 3 =L
19 - 1 =R
13 - 9 =N
18 - 2 =A
12 - 5 =D
15 - 6 =I
11 - 3 =H
0/13 letters found
Clue 3
Multiplication facts (1-12)
You check equal rows of footprints in the soft mud near the camp.
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
50
110
25
T
50
110
15
25
99
100
70
4
99
100
32
45
70
84
32
28
2
63
110
15
55
T
50
84
25
5 × 10 =T
9 × 7 =W
10 × 11 =H
10 × 10 =R
2 × 1 =D
1 × 4 =N
5 × 11 =S
9 × 5 =M
5 × 3 =I
12 × 7 =L
11 × 9 =F
5 × 5 =E
8 × 4 =O
7 × 10 =A
4 × 7 =U
0/15 letters found
Clue 4
Skip counting
You skip count by twos along the stepping stones across the creek.
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
42
36
16
100
120
A
42
130
60
16
28
28
39
26
20
6
16
20
36
16
16
6
39
45
15
16
60
28
39
39
36
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20E
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150P
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55U
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45O
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21S
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10H
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30N
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24T
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80F
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140C
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
You share the berry snacks equally among the scouts to get extra clues.
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
42 ÷ 7 = ?
21 ÷ 7 = ?
10 ÷ 10 = ?
88 ÷ 8 = ?
5 ÷ 1 = ?
40 ÷ 10 = ?
50 ÷ 5 = ?
36 ÷ 3 = ?
108 ÷ 12 = ?
35 ÷ 5 = ?
24 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain looked through a brass spyglass, then pinned on a trail badge.
2.The villain read a jungle map, then flashed a climber badge.
3.The villain climbed with a rope ladder, then pinned on a trail badge.
4.The villain read a jungle map, then showed an explorer badge.
5.The villain looked through a brass spyglass, then wore a tracker badge.
6.The villain climbed with a rope ladder, then earned a river badge.
7.The villain lit a camp lantern, then earned a river badge.
8.The villain lit a camp lantern, then flashed a climber badge.
9.The villain climbed with a rope ladder, then flashed a climber badge.
10.The villain looked through a brass spyglass, then showed an explorer badge.
11.The villain looked through a brass spyglass, then earned a river badge.
12.The villain lit a camp lantern, then pinned on a trail badge.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Treehouse Treasure Mystery
Culprit: Nina Nest (Camp Lantern · Climber Badge · Left Handed · Red Cap · Loud Whistle)
- Clue 1 (Addition): "THE THIEF DOES NOT HAVE A TRACKER BADGE"6 + 6 = 12 (T) · 5 + 5 = 10 (B) · 8 + 7 = 15 (I) · 6 + 5 = 11 (V) · 9 + 11 = 20 (O) · 3 + 2 = 5 (E) · 5 + 14 = 19 (H) · 5 + 11 = 16 (N) · 10 + 8 = 18 (R) · 6 + 2 = 8 (S) · 10 + 7 = 17 (K) · 7 + 2 = 9 (C) · 2 + 4 = 6 (D) · 2 + 5 = 7 (F) · 1 + 2 = 3 (G) · 1 + 1 = 2 (A)
- Clue 2 (Subtraction): "THE THIEF HELD THE MAP WITH THEIR LEFT HAND"8 - 2 = 6 (T) · 4 - 2 = 2 (W) · 19 - 9 = 10 (E) · 18 - 3 = 15 (F) · 17 - 3 = 14 (P) · 13 - 1 = 12 (M) · 20 - 3 = 17 (L) · 19 - 1 = 18 (R) · 13 - 9 = 4 (N) · 18 - 2 = 16 (A) · 12 - 5 = 7 (D) · 15 - 6 = 9 (I) · 11 - 3 = 8 (H)
- Clue 3 (Multiplication facts (1-12)): "THE THIEF RAN FROM A LOUD WHISTLE"5 × 10 = 50 (T) · 9 × 7 = 63 (W) · 10 × 11 = 110 (H) · 10 × 10 = 100 (R) · 2 × 1 = 2 (D) · 1 × 4 = 4 (N) · 5 × 11 = 55 (S) · 9 × 5 = 45 (M) · 5 × 3 = 15 (I) · 12 × 7 = 84 (L) · 11 × 9 = 99 (F) · 5 × 5 = 25 (E) · 8 × 4 = 32 (O) · 7 × 10 = 70 (A) · 4 × 7 = 28 (U)
- Clue 4 (Skip counting): "A RED CAP FELL ON THE TREEHOUSE FLOOR"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (P) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (U) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (O) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (S) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (H) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (T) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, ___, 70, 80 = 60 (F) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (C)
- Clue 5 (Division facts (1-12)): surviving statement (box 8) → Nina Nest42 ÷ 7 = 6 · 21 ÷ 7 = 3 · 10 ÷ 10 = 1 · 88 ÷ 8 = 11 · 5 ÷ 1 = 5 · 40 ÷ 10 = 4 · 50 ÷ 5 = 10 · 36 ÷ 3 = 12 · 108 ÷ 12 = 9 · 35 ÷ 5 = 7 · 24 ÷ 12 = 2
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Multiplication, Skip counting, Division
- Reading level
- grades 1-2
- Theme
- The Treehouse Treasure Mystery — set in Ferny Woods Adventure Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects