Grade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Camp Wildwood Mystery
Oh no! The shiny Golden Binoculars are missing from the main cabin. Someone took them! We must help Director Pete find the sneaky camper 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 activity | special gear | boot color | hair style | snack craving |
|---|---|---|---|---|---|
| Alex | hiking trails | walkie talkie | green mud boots | curly brown hair | salty cheese sticks |
| Toby | climbing trees | magnifying glass | red mud boots | spiky blond hair | sweet apple slices |
| Jack | climbing trees | magnifying glass | red mud boots | spiky blond hair | salty cheese sticks |
| Ella | cooking hotdogs | magnifying glass | green mud boots | spiky blond hair | salty cheese sticks |
| Mia | paddling canoes | spy flashlight | red mud boots | curly brown hair | salty cheese sticks |
| Ruby | cooking hotdogs | spy flashlight | green mud boots | straight black hair | sweet apple slices |
| Bindi | paddling canoes | spy flashlight | red mud boots | curly brown hair | sweet apple slices |
| Owen | cooking hotdogs | magnifying glass | green mud boots | curly brown hair | sticky marshmallows |
| Steve | cooking hotdogs | pocket compass | red mud boots | curly brown hair | salty cheese sticks |
| Jake | cooking hotdogs | pocket compass | green mud boots | spiky blond hair | sweet apple slices |
| Finn | hiking trails | spy flashlight | red mud boots | curly brown hair | salty cheese sticks |
| Leo | watching birds | spy flashlight | green mud boots | straight black hair | sweet apple slices |
| Cleo | paddling canoes | magnifying glass | red mud boots | curly brown hair | sticky marshmallows |
| Max | hiking trails | rope ladder | red mud boots | curly brown hair | salty cheese sticks |
| Sam | hiking trails | pocket compass | green mud boots | curly brown hair | salty cheese sticks |
| Lily | cooking hotdogs | magnifying glass | green mud boots | straight black hair | salty cheese sticks |
| Lara | cooking hotdogs | walkie talkie | red mud boots | curly brown hair | salty cheese sticks |
| Dora | cooking hotdogs | spy flashlight | green mud boots | curly brown hair | salty cheese sticks |
| Diego | cooking hotdogs | rope ladder | red mud boots | straight black hair | salty cheese sticks |
| Indiana | hiking trails | magnifying glass | green mud boots | straight black hair | salty cheese sticks |
| Ben | paddling canoes | rope ladder | green mud boots | straight black hair | sweet apple slices |
Clue 1
Addition
We need to pack the bags. Let us add the green ropes and blue ropes together to see the total.
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
9
19
20
17
6
10
10
15
6
18
4
7
20
13
18
7
T
9
19
15
17
20
15
11
7
12
20
10
15
4
4
20
11
2 + 7 =T
4 + 2 =I
8 + 4 =P
3 + 4 =O
12 + 5 =V
4 + 6 =L
11 + 8 =H
5 + 10 =A
14 + 6 =E
7 + 6 =S
3 + 1 =D
8 + 10 =N
8 + 3 =R
0/13 letters found
Clue 2
Subtraction
Some trail snacks are gone. Take away the eaten snacks to see how many are left in the jar.
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
3
19
13
17
2
17
15
13
8
T
3
10
13
9
5
13
17
12
13
11
14
2
11
1
4
4
T
3
T
3
12
9
8
7
17
5 - 2 =T
6 - 2 =O
17 - 5 =R
15 - 5 =L
18 - 1 =S
6 - 1 =V
10 - 9 =B
19 - 5 =M
18 - 3 =P
12 - 4 =C
14 - 7 =K
18 - 7 =D
6 - 4 =U
20 - 1 =H
16 - 3 =E
12 - 3 =A
0/16 letters found
Clue 3
Skip counting
Look at the trail. Count the muddy steps by twos to find where the tracks go.
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
40
27
120
60
18
T
40
70
55
55
120
24
T
40
70
120
22
T
40
18
22
28
T
40
60
50
27
120
120
18
120
18
T
40
90
50
20
18
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70Y
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26A
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, ___, 100, 110I
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60C
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24K
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30D
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65P
0/13 letters found
Clue 4
Place value
We found a locked box. The code has some tens and some ones. Let us read the number.
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
85
73
92
26
46
41
14
91
72
53
17
41
14
91
26
92
67
46
53
94
21
32
53
26
W
85
41
78
17
49
53
What number has 8 tens and 5 ones?W
What number has 1 ten and 4 ones?D
What number has 2 tens and 1 one?Y
What number has 4 tens and 9 ones?I
What number has 1 ten and 7 ones?A
What number has 6 tens and 7 ones?C
What number has 3 tens and 2 ones?B
What number has 9 tens and 2 ones?F
What number has 5 tens and 3 ones?R
What number has 7 tens and 3 ones?E
What number has 4 tens and 1 one?N
What number has 4 tens and 6 ones?U
What number has 2 tens and 6 ones?O
What number has 9 tens and 1 one?S
What number has 9 tens and 4 ones?L
What number has 7 tens and 8 ones?H
What number has 7 tens and 2 ones?T
0/17 letters found
Clue 5
Missing addends — the last clue
We have some canteens. We need more to fill the box. How many more do we need to make ten?
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
3 + ___ = 13
5 + ___ = 12
3 + ___ = 5
9 + ___ = 12
7 + ___ = 8
4 + ___ = 15
9 + ___ = 17
6 + ___ = 11
2 + ___ = 6
2 + ___ = 14
9 + ___ = 15
Step 2 — cross out the sentence with each answer
1.The villain scrambled up climbing trees, then checked a pocket compass.
2.The villain sneaked by cooking hotdogs, then checked a pocket compass.
3.The villain hid while watching birds, then buzzed on a walkie talkie.
4.The villain scrambled up climbing trees, then shined a spy flashlight.
5.The villain ran down the hiking trails, then checked a pocket compass.
6.The villain hid while watching birds, then checked a pocket compass.
7.The villain sneaked by cooking hotdogs, then buzzed on a walkie talkie.
8.The villain sped away paddling canoes, then buzzed on a walkie talkie.
9.The villain sped away paddling canoes, then shined a spy flashlight.
10.The villain ran down the hiking trails, then shined a spy flashlight.
11.The villain ran down the hiking trails, then buzzed on a walkie talkie.
12.The villain sped away paddling canoes, then checked a pocket compass.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Camp Wildwood Mystery
Culprit: Mia (paddling canoes · spy flashlight · red mud boots · curly brown hair · salty cheese sticks)
- Clue 1 (Addition): "THE VILLAIN DOES NOT HAVE A ROPE LADDER"2 + 7 = 9 (T) · 4 + 2 = 6 (I) · 8 + 4 = 12 (P) · 3 + 4 = 7 (O) · 12 + 5 = 17 (V) · 4 + 6 = 10 (L) · 11 + 8 = 19 (H) · 5 + 10 = 15 (A) · 14 + 6 = 20 (E) · 7 + 6 = 13 (S) · 3 + 1 = 4 (D) · 8 + 10 = 18 (N) · 8 + 3 = 11 (R)
- Clue 2 (Subtraction): "THE SUSPECT LEAVES RED MUD BOOT TRACKS"5 - 2 = 3 (T) · 6 - 2 = 4 (O) · 17 - 5 = 12 (R) · 15 - 5 = 10 (L) · 18 - 1 = 17 (S) · 6 - 1 = 5 (V) · 10 - 9 = 1 (B) · 19 - 5 = 14 (M) · 18 - 3 = 15 (P) · 12 - 4 = 8 (C) · 14 - 7 = 7 (K) · 18 - 7 = 11 (D) · 6 - 4 = 2 (U) · 20 - 1 = 19 (H) · 16 - 3 = 13 (E) · 12 - 3 = 9 (A)
- Clue 3 (Skip counting): "THEY STOPPED TO EAT SALTY CHEESE STICKS"Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (Y) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, ___, 24, 26 = 22 (A) · 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, ___, 100, 110 = 90 (I) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, ___, 55, 60 = 50 (C) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (K) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, ___, 27, 30 = 24 (D) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (S) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (P)
- Clue 4 (Place value): "WE FOUND STRANDS OF CURLY BROWN HAIR"What number has 8 tens and 5 ones? = 85 (W) · What number has 1 ten and 4 ones? = 14 (D) · What number has 2 tens and 1 one? = 21 (Y) · What number has 4 tens and 9 ones? = 49 (I) · What number has 1 ten and 7 ones? = 17 (A) · What number has 6 tens and 7 ones? = 67 (C) · What number has 3 tens and 2 ones? = 32 (B) · What number has 9 tens and 2 ones? = 92 (F) · What number has 5 tens and 3 ones? = 53 (R) · What number has 7 tens and 3 ones? = 73 (E) · What number has 4 tens and 1 one? = 41 (N) · What number has 4 tens and 6 ones? = 46 (U) · What number has 2 tens and 6 ones? = 26 (O) · What number has 9 tens and 1 one? = 91 (S) · What number has 9 tens and 4 ones? = 94 (L) · What number has 7 tens and 8 ones? = 78 (H) · What number has 7 tens and 2 ones? = 72 (T)
- Clue 5 (Missing addends): surviving statement (box 9) → Mia3 + ___ = 13 = 10 · 5 + ___ = 12 = 7 · 3 + ___ = 5 = 2 · 9 + ___ = 12 = 3 · 7 + ___ = 8 = 1 · 4 + ___ = 15 = 11 · 9 + ___ = 17 = 8 · 6 + ___ = 11 = 5 · 2 + ___ = 6 = 4 · 2 + ___ = 14 = 12 · 9 + ___ = 15 = 6
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 Camp Wildwood Mystery — set in Camp Wildwood Jungle Treehouse
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects