Grade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Mystery of Treehouse Island
Someone took the Golden Banana from the Treehouse Fort! Chief Ranger Pip needs your help to find the sneaky bandit. Let us look at the clues and solve the case!
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 | Gear | Skill | Dominant Hand | Cap Color | Distraction |
|---|---|---|---|---|---|
| Alex | shiny flashlight | soft step | right handed | green cap | shiny coins |
| Skye | shiny flashlight | quick leap | right handed | blue cap | sweet juice |
| Jack | trusty map | quick leap | left handed | blue cap | loud noises |
| Rubble | walkie talkie | high jump | left handed | blue cap | sweet juice |
| Indiana | climbing rope | quick leap | left handed | red cap | loud noises |
| Tracker | climbing rope | loud whistle | right handed | red cap | shiny coins |
| Annie | walkie talkie | super climb | right handed | green cap | shiny coins |
| Chase | pocket compass | quick leap | right handed | green cap | shiny coins |
| Marshall | trusty map | super climb | right handed | red cap | loud noises |
| Steve | pocket compass | soft step | left handed | green cap | shiny coins |
| Zack | walkie talkie | quick leap | right handed | red cap | loud noises |
| Penny | shiny flashlight | soft step | right handed | green cap | loud noises |
| Lara | walkie talkie | soft step | right handed | blue cap | loud noises |
| Ryder | climbing rope | quick leap | right handed | green cap | shiny coins |
| Bindi | climbing rope | high jump | right handed | green cap | shiny coins |
| Leo | shiny flashlight | high jump | left handed | green cap | sweet juice |
| Sam | climbing rope | loud whistle | left handed | blue cap | sweet juice |
| Diego | shiny flashlight | quick leap | right handed | red cap | shiny coins |
| Zuma | walkie talkie | super climb | left handed | green cap | loud noises |
| Cody | walkie talkie | super climb | right handed | red cap | loud noises |
| Rocky | shiny flashlight | super climb | right handed | blue cap | shiny coins |
Clue 1
Place value
Chief Ranger Pip finds a locked box with code blocks. The tens block and ones block show us 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
87
34
76
67
16
97
33
51
T
87
33
59
76
92
97
59
T
87
33
59
T
87
34
76
34
51
80
34
52
83
94
72
What number has 8 tens and 7 ones?T
What number has 3 tens and 4 ones?H
What number has 8 tens and 0 ones?G
What number has 9 tens and 7 ones?N
What number has 5 tens and 9 ones?O
What number has 5 tens and 1 one?I
What number has 8 tens and 3 ones?U
What number has 5 tens and 2 ones?J
What number has 6 tens and 7 ones?B
What number has 7 tens and 6 ones?E
What number has 1 ten and 6 ones?A
What number has 7 tens and 2 ones?P
What number has 9 tens and 2 ones?S
What number has 3 tens and 3 ones?D
What number has 9 tens and 4 ones?M
0/15 letters found
Clue 2
Addition
We find two bags of shiny coins on the trail. Let us add them together to see what the bandit dropped.
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
96
45
43
38
55
80
33
52
T
96
61
29
43
29
T
96
45
43
52
59
59
52
95
45
T
96
45
55
80
33
31 + 65 =T
15 + 14 =S
15 + 30 =H
16 + 17 =D
20 + 32 =I
20 + 23 =E
33 + 28 =U
36 + 23 =R
54 + 41 =G
42 + 38 =N
11 + 27 =B
26 + 29 =A
0/12 letters found
Clue 3
Subtraction
The bandit dropped some bananas from their pack. We subtract the lost ones to find 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
47
53
70
79
27
50
70
59
T
47
28
63
63
70
14
16
79
59
53
82
72
79
39
28
82
72
59
60 - 13 =T
81 - 11 =E
66 - 16 =R
109 - 30 =Y
96 - 14 =I
43 - 4 =C
42 - 15 =A
75 - 12 =P
97 - 38 =S
107 - 35 =N
35 - 19 =B
33 - 19 =D
57 - 4 =H
38 - 10 =O
0/14 letters found
Clue 4
Skip counting
Look at the footprints on the muddy path. They jump by twos. Count them to find the hidden trail.
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
18
33
6
26
15
10
16
20
16
20
45
42
70
45
33
33
10
22
20
55
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24W
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65P
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24A
Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25U
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90G
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48K
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26C
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55R
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30O
0/13 letters found
Clue 5
Missing addends — the last clue
We need ten camp flags but only find six. Find the missing count to open the last gate.
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 + ___ = 12
4 + ___ = 13
8 + ___ = 9
4 + ___ = 16
7 + ___ = 14
4 + ___ = 9
3 + ___ = 6
10 + ___ = 14
3 + ___ = 5
7 + ___ = 13
5 + ___ = 15
Step 2 — cross out the sentence with each answer
1.The villain talks on a walkie talkie, then does a super climb.
2.The villain shines a shiny flashlight, then makes a quick leap.
3.The villain talks on a walkie talkie, then blows a loud whistle.
4.The villain checks a pocket compass, then takes a soft step.
5.The villain uses a climbing rope, then takes a soft step.
6.The villain reads a trusty map, then takes a soft step.
7.The villain reads a trusty map, then does a super climb.
8.The villain checks a pocket compass, then makes a quick leap.
9.The villain uses a climbing rope, then makes a quick leap.
10.The villain talks on a walkie talkie, then does a high jump.
11.The villain shines a shiny flashlight, then takes a soft step.
12.The villain shines a shiny flashlight, then does a high jump.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of Treehouse Island
Culprit: Chase (pocket compass · quick leap · right handed · green cap · shiny coins)
- Clue 1 (Place value): "THE BANDIT DOES NOT DO THE HIGH JUMP"What number has 8 tens and 7 ones? = 87 (T) · What number has 3 tens and 4 ones? = 34 (H) · What number has 8 tens and 0 ones? = 80 (G) · What number has 9 tens and 7 ones? = 97 (N) · What number has 5 tens and 9 ones? = 59 (O) · What number has 5 tens and 1 one? = 51 (I) · What number has 8 tens and 3 ones? = 83 (U) · What number has 5 tens and 2 ones? = 52 (J) · What number has 6 tens and 7 ones? = 67 (B) · What number has 7 tens and 6 ones? = 76 (E) · What number has 1 ten and 6 ones? = 16 (A) · What number has 7 tens and 2 ones? = 72 (P) · What number has 9 tens and 2 ones? = 92 (S) · What number has 3 tens and 3 ones? = 33 (D) · What number has 9 tens and 4 ones? = 94 (M)
- Clue 2 (Addition): "THE BANDIT USES THEIR RIGHT HAND"31 + 65 = 96 (T) · 15 + 14 = 29 (S) · 15 + 30 = 45 (H) · 16 + 17 = 33 (D) · 20 + 32 = 52 (I) · 20 + 23 = 43 (E) · 33 + 28 = 61 (U) · 36 + 23 = 59 (R) · 54 + 41 = 95 (G) · 42 + 38 = 80 (N) · 11 + 27 = 38 (B) · 26 + 29 = 55 (A)
- Clue 3 (Subtraction): "THEY ARE STOPPED BY SHINY COINS"60 - 13 = 47 (T) · 81 - 11 = 70 (E) · 66 - 16 = 50 (R) · 109 - 30 = 79 (Y) · 96 - 14 = 82 (I) · 43 - 4 = 39 (C) · 42 - 15 = 27 (A) · 75 - 12 = 63 (P) · 97 - 38 = 59 (S) · 107 - 35 = 72 (N) · 35 - 19 = 16 (B) · 33 - 19 = 14 (D) · 57 - 4 = 53 (H) · 38 - 10 = 28 (O)
- Clue 4 (Skip counting): "WE FOUND A DARK GREEN CAP"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (P) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (A) · Skip-count by 5s. Fill the blank: 5, 10, ___, 20, 25 = 15 (U) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (G) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (K) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (C) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (R) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (O)
- Clue 5 (Missing addends): surviving statement (box 8) → Chase1 + ___ = 12 = 11 · 4 + ___ = 13 = 9 · 8 + ___ = 9 = 1 · 4 + ___ = 16 = 12 · 7 + ___ = 14 = 7 · 4 + ___ = 9 = 5 · 3 + ___ = 6 = 3 · 10 + ___ = 14 = 4 · 3 + ___ = 5 = 2 · 7 + ___ = 13 = 6 · 5 + ___ = 15 = 10
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Mystery of Treehouse Island — set in Treehouse Island
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects