Grade 1Reading: grades 1-2Skip countingAdditionSubtractionPlace valueMissing addends
The Great Jungle Treehouse Mystery
The golden banana is gone from the treehouse temple! The Monkey King is very sad. We must follow the clues in the jungle and find the sneaky bandit.
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 Tool | Jungle Gear | Writing Hand | Headwear | Best Trap |
|---|---|---|---|---|---|
| Mia | pocket compass | safari hat | left handed | blue helmet | bright flashlights |
| Max | magnifying glass | canvas backpack | left handed | green cap | shiny stickers |
| Rex | climbing rope | yellow poncho | right handed | red bandana | bright flashlights |
| Ben | night goggles | yellow poncho | left handed | green cap | banana peels |
| Amy | night goggles | safari hat | left handed | blue helmet | banana peels |
| Ned | magnifying glass | muddy boots | left handed | green cap | banana peels |
| Kip | climbing rope | safari hat | left handed | green cap | bright flashlights |
| Joy | pocket compass | camo jacket | right handed | green cap | bright flashlights |
| Ava | pocket compass | canvas backpack | right handed | green cap | bright flashlights |
| Tom | magnifying glass | safari hat | left handed | green cap | bright flashlights |
| Dan | night goggles | yellow poncho | left handed | red bandana | bright flashlights |
| Fin | magnifying glass | yellow poncho | left handed | red bandana | bright flashlights |
| Leo | magnifying glass | canvas backpack | left handed | green cap | banana peels |
| Zoe | magnifying glass | safari hat | left handed | blue helmet | banana peels |
| Gus | magnifying glass | camo jacket | right handed | blue helmet | bright flashlights |
| Ivy | magnifying glass | muddy boots | left handed | red bandana | banana peels |
| Pam | pocket compass | yellow poncho | left handed | red bandana | bright flashlights |
| Eva | magnifying glass | safari hat | left handed | blue helmet | bright flashlights |
| Jax | magnifying glass | camo jacket | left handed | red bandana | bright flashlights |
| Sam | climbing rope | muddy boots | right handed | red bandana | shiny stickers |
| Fay | magnifying glass | canvas backpack | left handed | red bandana | bright flashlights |
Clue 1
Skip counting
We find footprints on the trail. Let us count them by twos to see how far the bandit ran.
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
42
140
33
65
15
28
120
40
T
42
120
90
33
50
28
90
T
42
35
33
15
9
15
55
15
100
90
36
15
55
30
33
T
42
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42J
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120M
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65C
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60I
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60S
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75B
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160H
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21A
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110O
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32N
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45W
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36K
0/16 letters found
Clue 2
Addition
We gather all the lost map pieces we found on the grass. Let us add them together.
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
4
11
18
16
15
17
16
15
6
17
10
T
4
10
13
9
18
19
T
4
11
15
6
17
18
17
1 + 3 =T
7 + 4 =H
6 + 9 =A
8 + 8 =B
2 + 7 =L
1 + 5 =N
10 + 8 =E
7 + 6 =S
11 + 8 =F
11 + 6 =D
4 + 6 =I
0/11 letters found
Clue 3
Subtraction
The bandit dropped a bag of shiny rocks. We take away the cracked ones to count the rest.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
S
8
6
7
19
10
2
4
10
9
17
14
2
4
12
19
14
16
4
2
1
13
7
S
8
4
13
14
16
4
2
S
8
11 - 3 =S
4 - 3 =F
20 - 1 =R
8 - 2 =C
15 - 5 =E
16 - 3 =L
17 - 1 =G
14 - 5 =M
12 - 5 =A
9 - 7 =T
11 - 7 =H
17 - 3 =I
18 - 1 =W
18 - 6 =B
0/14 letters found
Clue 4
Place value
The treehouse door has a secret lock. We look at the tens and ones to find the code.
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
88
23
74
11
61
87
37
47
T
88
23
56
74
24
39
74
87
78
11
87
78
74
77
38
87
61
77
87
61
87
What number has 8 tens and 8 ones?T
What number has 2 tens and 3 ones?H
What number has 1 ten and 1 one?S
What number has 8 tens and 7 ones?A
What number has 5 tens and 6 ones?I
What number has 3 tens and 8 ones?B
What number has 4 tens and 7 ones?K
What number has 7 tens and 4 ones?E
What number has 7 tens and 8 ones?R
What number has 7 tens and 7 ones?D
What number has 6 tens and 1 one?N
What number has 3 tens and 7 ones?C
What number has 2 tens and 4 ones?F
What number has 3 tens and 9 ones?W
0/14 letters found
Clue 5
Missing addends — the last clue
We need ten banana treats to feed the friendly monkey. We have some but need to find the rest.
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 + ___ = 13
1 + ___ = 12
2 + ___ = 5
8 + ___ = 17
8 + ___ = 16
7 + ___ = 9
9 + ___ = 10
4 + ___ = 10
9 + ___ = 14
4 + ___ = 11
6 + ___ = 16
Step 2 — cross out the sentence with each answer
1.The villain swings on a rope, then runs down the dirt path.
2.The villain crosses the log bridge, then runs down the dirt path.
3.The villain crawls through the ferns, then runs down the dirt path.
4.The villain paddles the canoe, then hides in the green bushes.
5.The villain crawls through the ferns, then splashes in the mud.
6.The villain climbs the big tree, then runs down the dirt path.
7.The villain paddles the canoe, then runs down the dirt path.
8.The villain crawls through the ferns, then grabs the golden banana.
9.The villain paddles the canoe, then grabs the golden banana.
10.The villain paddles the canoe, then zips down the vine.
11.The villain climbs the big tree, then hides in the green bushes.
12.The villain crawls through the ferns, then hides in the green bushes.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Jungle Treehouse Mystery
Culprit: Pam (pocket compass · yellow poncho · left handed · red bandana · bright flashlights)
- Clue 1 (Skip counting): "THE BANDIT DOES NOT WEAR A CAMO JACKET"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (J) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (M) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (C) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (S) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (B) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (H) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (A) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (O) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (N) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (W) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36 = 30 (K)
- Clue 2 (Addition): "THE BAD BANDIT IS LEFT HANDED"1 + 3 = 4 (T) · 7 + 4 = 11 (H) · 6 + 9 = 15 (A) · 8 + 8 = 16 (B) · 2 + 7 = 9 (L) · 1 + 5 = 6 (N) · 10 + 8 = 18 (E) · 7 + 6 = 13 (S) · 11 + 8 = 19 (F) · 11 + 6 = 17 (D) · 4 + 6 = 10 (I)
- Clue 3 (Subtraction): "SCARE THEM WITH BRIGHT FLASHLIGHTS"11 - 3 = 8 (S) · 4 - 3 = 1 (F) · 20 - 1 = 19 (R) · 8 - 2 = 6 (C) · 15 - 5 = 10 (E) · 16 - 3 = 13 (L) · 17 - 1 = 16 (G) · 14 - 5 = 9 (M) · 12 - 5 = 7 (A) · 9 - 7 = 2 (T) · 11 - 7 = 4 (H) · 17 - 3 = 14 (I) · 18 - 1 = 17 (W) · 18 - 6 = 12 (B)
- Clue 4 (Place value): "THE SNACK THIEF WEARS A RED BANDANA"What number has 8 tens and 8 ones? = 88 (T) · What number has 2 tens and 3 ones? = 23 (H) · What number has 1 ten and 1 one? = 11 (S) · What number has 8 tens and 7 ones? = 87 (A) · What number has 5 tens and 6 ones? = 56 (I) · What number has 3 tens and 8 ones? = 38 (B) · What number has 4 tens and 7 ones? = 47 (K) · What number has 7 tens and 4 ones? = 74 (E) · What number has 7 tens and 8 ones? = 78 (R) · What number has 7 tens and 7 ones? = 77 (D) · What number has 6 tens and 1 one? = 61 (N) · What number has 3 tens and 7 ones? = 37 (C) · What number has 2 tens and 4 ones? = 24 (F) · What number has 3 tens and 9 ones? = 39 (W)
- Clue 5 (Missing addends): surviving statement (box 4) → Pam1 + ___ = 13 = 12 · 1 + ___ = 12 = 11 · 2 + ___ = 5 = 3 · 8 + ___ = 17 = 9 · 8 + ___ = 16 = 8 · 7 + ___ = 9 = 2 · 9 + ___ = 10 = 1 · 4 + ___ = 10 = 6 · 9 + ___ = 14 = 5 · 4 + ___ = 11 = 7 · 6 + ___ = 16 = 10
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Skip counting, Addition, Subtraction, Place value, Missing addends
- Reading level
- grades 1-2
- Theme
- The Great Jungle Treehouse Mystery — set in the Whispering Jungle
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects