Grade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Great Treehouse Treasure Mystery
Someone hid the golden jungle compass! The Treehouse Explorers need your help to crack the clues and catch the sneaky prankster 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 | Jungle Gadget | Explorers Badge | Whistle Strap | Cap Color | Jungle Fear |
|---|---|---|---|---|---|
| Ivy Vines | Signal Mirror | Trail Blazer Badge | Left Strap | Sky Blue Cap | Scared Of Heights |
| Toby Trail | Jungle Compass | Trail Blazer Badge | Left Strap | Sky Blue Cap | Scared Of Heights |
| Sora Sky | Pocket Flashlight | Trail Blazer Badge | Right Strap | Sunny Yellow Cap | Scared Of Mud |
| Ella Echo | Jungle Compass | Trail Blazer Badge | Right Strap | Sky Blue Cap | Scared Of Heights |
| Zoe Zips | Grappling Hook | Bug Hunter Badge | Left Strap | Bright Red Cap | Scared Of Heights |
| Maya Maples | Rope Launcher | Map Reader Badge | Left Strap | Sky Blue Cap | Scared Of Bugs |
| Jack Jungle | Rope Launcher | Tree Climber Badge | Left Strap | Sky Blue Cap | Scared Of Heights |
| Daisy Vine | Rope Launcher | Tree Climber Badge | Right Strap | Bright Red Cap | Scared Of Mud |
| Mason Mud | Pocket Flashlight | Camp Chef Badge | Left Strap | Sunny Yellow Cap | Scared Of Heights |
| Ollie Oak | Rope Launcher | Trail Blazer Badge | Right Strap | Sky Blue Cap | Scared Of Heights |
| Finn Forest | Signal Mirror | Map Reader Badge | Right Strap | Sunny Yellow Cap | Scared Of Bugs |
| Hugo Hill | Rope Launcher | Tree Climber Badge | Left Strap | Bright Red Cap | Scared Of Bugs |
| Ruby Rivers | Jungle Compass | Trail Blazer Badge | Right Strap | Sunny Yellow Cap | Scared Of Heights |
| Gabe Grove | Jungle Compass | Camp Chef Badge | Left Strap | Bright Red Cap | Scared Of Bugs |
| Leo Leaf | Grappling Hook | Map Reader Badge | Right Strap | Sky Blue Cap | Scared Of Heights |
| Lily Lake | Jungle Compass | Trail Blazer Badge | Right Strap | Bright Red Cap | Scared Of Bugs |
| Clara Cliff | Jungle Compass | Bug Hunter Badge | Right Strap | Bright Red Cap | Scared Of Mud |
| Kai Moss | Rope Launcher | Bug Hunter Badge | Left Strap | Sky Blue Cap | Scared Of Heights |
| Piper Pine | Pocket Flashlight | Trail Blazer Badge | Left Strap | Sky Blue Cap | Scared Of Mud |
| Sammy Swift | Signal Mirror | Trail Blazer Badge | Left Strap | Bright Red Cap | Scared Of Mud |
| Cora Creek | Grappling Hook | Trail Blazer Badge | Left Strap | Sky Blue Cap | Scared Of Heights |
Clue 1
Addition
Ranger Rick adds up the trail markers found on the path to unlock the first clue.
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
10
6
16
12
17
17
19
12
4
8
5
6
13
4
5
T
2
10
19
16
6
19
7
14
9
10
14
4
T
2
6
3
7
19
8
9
6
1 + 1 =T
2 + 1 =R
3 + 3 =E
12 + 5 =L
2 + 7 =G
4 + 12 =V
7 + 5 =I
4 + 4 =D
6 + 4 =H
7 + 6 =S
13 + 6 =A
6 + 8 =U
3 + 4 =B
4 + 1 =O
3 + 1 =N
0/15 letters found
Clue 2
Subtraction
The team counts how many snack bars are left in the pack to read the next 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
15
4
11
14
13
9
9
1
13
18
3
11
1
8
7
1
3
4
13
7
T
15
9
11
5
18
T
15
4
11
9
11
17
T
15
7
T
15
8
1
10
19 - 4 =T
16 - 3 =I
17 - 7 =P
16 - 7 =L
20 - 2 =N
10 - 3 =S
17 - 3 =V
16 - 5 =E
14 - 9 =O
7 - 3 =H
10 - 2 =R
10 - 7 =W
3 - 2 =A
18 - 1 =F
0/14 letters found
Clue 3
Skip counting
Maya skip counts the campfire logs by twos to decode the hidden message.
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
140
24
45
130
65
70
70
36
65
22
90
36
22
36
26
36
10
120
90
25
28
T
140
24
45
T
140
36
70
70
T
140
25
26
45
90
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160T
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32M
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110R
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28H
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42A
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14Y
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150V
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80L
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35O
0/14 letters found
Clue 4
Place value
Leo looks at the tens and ones on the treehouse lock to reveal another hint.
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
65
13
39
35
28
22
41
59
91
A
65
48
47
A
65
13
61
45
32
48
48
59
61
88
59
A
65
45
30
67
59
30
45
59
59
What number has 6 tens and 5 ones?A
What number has 8 tens and 8 ones?N
What number has 2 tens and 8 ones?B
What number has 4 tens and 7 ones?W
What number has 4 tens and 8 ones?P
What number has 6 tens and 1 one?D
What number has 9 tens and 1 one?C
What number has 3 tens and 0 ones?T
What number has 1 ten and 3 ones?S
What number has 3 tens and 5 ones?Y
What number has 3 tens and 9 ones?K
What number has 5 tens and 9 ones?E
What number has 4 tens and 5 ones?R
What number has 2 tens and 2 ones?L
What number has 3 tens and 2 ones?O
What number has 4 tens and 1 one?U
What number has 6 tens and 7 ones?H
0/17 letters found
Clue 5
Missing addends — the last clue
Finn figures out how many more pinecones are needed to balance the scale.
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
10 + ___ = 13
10 + ___ = 12
1 + ___ = 12
2 + ___ = 9
4 + ___ = 9
8 + ___ = 17
2 + ___ = 8
9 + ___ = 13
9 + ___ = 10
7 + ___ = 19
3 + ___ = 11
Step 2 — cross out the sentence with each answer
1.The villain fired a rope launcher, then pinned on a bug hunter badge.
2.The villain checked a jungle compass, then pinned on a trail blazer badge.
3.The villain flashed a signal mirror, then pinned on a trail blazer badge.
4.The villain shined a pocket flashlight, then pinned on a trail blazer badge.
5.The villain fired a rope launcher, then pinned on a camp chef badge.
6.The villain swung with a grappling hook, then pinned on a camp chef badge.
7.The villain flashed a signal mirror, then pinned on a camp chef badge.
8.The villain flashed a signal mirror, then pinned on a bug hunter badge.
9.The villain fired a rope launcher, then pinned on a trail blazer badge.
10.The villain fired a rope launcher, then pinned on a tree climber badge.
11.The villain swung with a grappling hook, then pinned on a trail blazer badge.
12.The villain swung with a grappling hook, then pinned on a bug hunter badge.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Treehouse Treasure Mystery
Culprit: Jack Jungle (Rope Launcher · Tree Climber Badge · Left Strap · Sky Blue Cap · Scared Of Heights)
- Clue 1 (Addition): "THE VILLAIN DOES NOT HAVE A BUG HUNTER BADGE"1 + 1 = 2 (T) · 2 + 1 = 3 (R) · 3 + 3 = 6 (E) · 12 + 5 = 17 (L) · 2 + 7 = 9 (G) · 4 + 12 = 16 (V) · 7 + 5 = 12 (I) · 4 + 4 = 8 (D) · 6 + 4 = 10 (H) · 7 + 6 = 13 (S) · 13 + 6 = 19 (A) · 6 + 8 = 14 (U) · 3 + 4 = 7 (B) · 4 + 1 = 5 (O) · 3 + 1 = 4 (N)
- Clue 2 (Subtraction): "THE VILLAIN WEARS A WHISTLE ON THE LEFT STRAP"19 - 4 = 15 (T) · 16 - 3 = 13 (I) · 17 - 7 = 10 (P) · 16 - 7 = 9 (L) · 20 - 2 = 18 (N) · 10 - 3 = 7 (S) · 17 - 3 = 14 (V) · 16 - 5 = 11 (E) · 14 - 9 = 5 (O) · 7 - 3 = 4 (H) · 10 - 2 = 8 (R) · 10 - 7 = 3 (W) · 3 - 2 = 1 (A) · 18 - 1 = 17 (F)
- Clue 3 (Skip counting): "THE VILLAIN RAN AWAY FROM THE TALL TOWER"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (T) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (M) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (R) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (I) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (A) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (Y) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (V) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (L) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, ___, 30, 35 = 25 (O)
- Clue 4 (Place value): "A SKY BLUE CAP WAS DROPPED NEAR THE TREE"What number has 6 tens and 5 ones? = 65 (A) · What number has 8 tens and 8 ones? = 88 (N) · What number has 2 tens and 8 ones? = 28 (B) · What number has 4 tens and 7 ones? = 47 (W) · What number has 4 tens and 8 ones? = 48 (P) · What number has 6 tens and 1 one? = 61 (D) · What number has 9 tens and 1 one? = 91 (C) · What number has 3 tens and 0 ones? = 30 (T) · What number has 1 ten and 3 ones? = 13 (S) · What number has 3 tens and 5 ones? = 35 (Y) · What number has 3 tens and 9 ones? = 39 (K) · What number has 5 tens and 9 ones? = 59 (E) · What number has 4 tens and 5 ones? = 45 (R) · What number has 2 tens and 2 ones? = 22 (L) · What number has 3 tens and 2 ones? = 32 (O) · What number has 4 tens and 1 one? = 41 (U) · What number has 6 tens and 7 ones? = 67 (H)
- Clue 5 (Missing addends): surviving statement (box 10) → Jack Jungle10 + ___ = 13 = 3 · 10 + ___ = 12 = 2 · 1 + ___ = 12 = 11 · 2 + ___ = 9 = 7 · 4 + ___ = 9 = 5 · 8 + ___ = 17 = 9 · 2 + ___ = 8 = 6 · 9 + ___ = 13 = 4 · 9 + ___ = 10 = 1 · 7 + ___ = 19 = 12 · 3 + ___ = 11 = 8
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Skip counting, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Great Treehouse Treasure Mystery — set in Whispering Jungle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects