Grade 1Reading: grades 1-2AdditionSubtractionSkip countingPlace valueMissing addends
The Mystery at Adventure Camp
Someone took the camp trophy! The Junior Explorers must look for clues and find the thief 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 | Gear | Gadget | Stance | Hat Color | Fear |
|---|---|---|---|---|---|
| Zoe | Map | Flashlight | Right Handed | Red Hat | Bright Lights |
| Jack | Binoculars | Walkie Talkie | Right Handed | Red Hat | Loud Whistles |
| Ruby | Rope | Walkie Talkie | Left Handed | Red Hat | Squeaky Toys |
| Grace | Map | Whistle | Right Handed | Green Hat | Bright Lights |
| Mia | Binoculars | Flashlight | Left Handed | Blue Hat | Squeaky Toys |
| Oliver | Binoculars | Walkie Talkie | Left Handed | Red Hat | Squeaky Toys |
| Nora | Map | Flashlight | Right Handed | Blue Hat | Bright Lights |
| James | Rope | Spyglass | Right Handed | Red Hat | Bright Lights |
| Sam | Binoculars | Whistle | Right Handed | Green Hat | Squeaky Toys |
| Lucas | Lantern | Whistle | Left Handed | Green Hat | Bright Lights |
| Mason | Compass | Spyglass | Right Handed | Blue Hat | Bright Lights |
| Leo | Map | Flashlight | Left Handed | Blue Hat | Loud Whistles |
| Lily | Lantern | Walkie Talkie | Left Handed | Blue Hat | Loud Whistles |
| Ava | Compass | Flashlight | Left Handed | Red Hat | Bright Lights |
| Ethan | Lantern | Walkie Talkie | Right Handed | Blue Hat | Bright Lights |
| Maya | Binoculars | Grappling Hook | Right Handed | Red Hat | Bright Lights |
| Chloe | Binoculars | Whistle | Right Handed | Red Hat | Bright Lights |
| Noah | Compass | Grappling Hook | Left Handed | Red Hat | Loud Whistles |
| Liam | Rope | Flashlight | Left Handed | Red Hat | Bright Lights |
| Max | Rope | Whistle | Right Handed | Red Hat | Bright Lights |
| Sofia | Rope | Flashlight | Left Handed | Blue Hat | Loud Whistles |
Clue 1
Addition
We added up the total supplies left at camp to gather our 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
12
3
20
4
2
20
16
13
6
T
12
3
8
20
19
11
14
20
4
2
14
T
12
10
16
5
5
6
16
4
9
6
18
7
16
4
4
5 + 7 =T
6 + 8 =O
2 + 2 =S
5 + 6 =D
3 + 2 =R
2 + 5 =L
1 + 1 =N
11 + 5 =A
11 + 8 =F
5 + 5 =C
3 + 6 =P
1 + 2 =H
5 + 1 =Y
13 + 7 =E
3 + 10 =K
5 + 3 =I
11 + 7 =G
0/17 letters found
Clue 2
Subtraction
We subtracted the missing gear to find out what was taken.
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
14
3
18
16
9
10
12
18
16
3
18
19
12
T
14
3
18
2
9
6
5
10
T
14
3
T
14
3
18
10
16
16
10
7
3
T
14
3
9
17
12
19 - 5 =T
11 - 4 =G
11 - 5 =P
16 - 6 =I
20 - 1 =L
19 - 3 =R
20 - 2 =E
11 - 6 =W
13 - 1 =D
18 - 9 =A
4 - 1 =H
9 - 7 =M
19 - 2 =N
0/13 letters found
Clue 3
Skip counting
We counted footprint pairs by twos down the dirt 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
9
14
6
T
9
14
130
6
100
39
55
70
26
20
33
35
6
12
33
26
55
42
100
70
16
20
33
70
130
30
14
T
9
35
130
30
14
T
9
39
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15T
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, ___, 16, 18H
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80R
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150I
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24M
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39B
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36G
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120F
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20O
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65C
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16D
0/16 letters found
Clue 4
Place value
We checked the tens and ones on the locker lock to open the 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.
A
89
46
72
38
86
A
89
22
84
46
17
87
26
A
89
82
98
72
50
22
79
48
22
86
72
22
46
A
89
17
98
What number has 8 tens and 9 ones?A
What number has 4 tens and 6 ones?R
What number has 2 tens and 2 ones?T
What number has 2 tens and 6 ones?W
What number has 9 tens and 8 ones?L
What number has 7 tens and 9 ones?O
What number has 5 tens and 0 ones?F
What number has 8 tens and 7 ones?M
What number has 8 tens and 6 ones?H
What number has 8 tens and 4 ones?B
What number has 8 tens and 2 ones?S
What number has 4 tens and 8 ones?N
What number has 7 tens and 2 ones?E
What number has 3 tens and 8 ones?D
What number has 1 ten and 7 ones?I
0/15 letters found
Clue 5
Missing addends — the last clue
We found the missing number of badges to solve the camp secret code.
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
8 + ___ = 19
1 + ___ = 6
6 + ___ = 15
4 + ___ = 8
4 + ___ = 10
8 + ___ = 18
3 + ___ = 6
5 + ___ = 6
6 + ___ = 8
5 + ___ = 17
1 + ___ = 9
Step 2 — cross out the sentence with each answer
1.The villain lit a lantern, then talked on a walkie talkie.
2.The villain unclipped a compass, then peered through a spyglass.
3.The villain lit a lantern, then threw a grappling hook.
4.The villain lit a lantern, then clicked on a flashlight.
5.The villain looked through binoculars, then threw a grappling hook.
6.The villain lit a lantern, then peered through a spyglass.
7.The villain swung on a rope, then blew a whistle.
8.The villain looked through binoculars, then peered through a spyglass.
9.The villain unrolled a map, then clicked on a flashlight.
10.The villain unrolled a map, then talked on a walkie talkie.
11.The villain looked through binoculars, then blew a whistle.
12.The villain looked through binoculars, then clicked on a flashlight.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery at Adventure Camp
Culprit: Max (Rope · Whistle · Right Handed · Red Hat · Bright Lights)
- Clue 1 (Addition): "THE SNEAKY THIEF DOES NOT CARRY A SPYGLASS"5 + 7 = 12 (T) · 6 + 8 = 14 (O) · 2 + 2 = 4 (S) · 5 + 6 = 11 (D) · 3 + 2 = 5 (R) · 2 + 5 = 7 (L) · 1 + 1 = 2 (N) · 11 + 5 = 16 (A) · 11 + 8 = 19 (F) · 5 + 5 = 10 (C) · 3 + 6 = 9 (P) · 1 + 2 = 3 (H) · 5 + 1 = 6 (Y) · 13 + 7 = 20 (E) · 3 + 10 = 13 (K) · 5 + 3 = 8 (I) · 11 + 7 = 18 (G)
- Clue 2 (Subtraction): "THE RAIDER HELD THE MAP WITH THEIR RIGHT HAND"19 - 5 = 14 (T) · 11 - 4 = 7 (G) · 11 - 5 = 6 (P) · 16 - 6 = 10 (I) · 20 - 1 = 19 (L) · 19 - 3 = 16 (R) · 20 - 2 = 18 (E) · 11 - 6 = 5 (W) · 13 - 1 = 12 (D) · 18 - 9 = 9 (A) · 4 - 1 = 3 (H) · 9 - 7 = 2 (M) · 19 - 2 = 17 (N)
- Clue 3 (Skip counting): "THE THIEF SCRAMBLED BACK FROM BRIGHT LIGHTS"Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (T) · 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, ___, 16, 18 = 14 (H) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, ___, 75, 80 = 70 (R) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, ___, 140, 150 = 130 (I) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (M) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (B) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, ___, 33, 36 = 30 (G) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (F) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (O) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (C) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, ___, 14, 16 = 12 (D)
- Clue 4 (Place value): "A RED HAT BRIM WAS LEFT ON THE TRAIL"What number has 8 tens and 9 ones? = 89 (A) · What number has 4 tens and 6 ones? = 46 (R) · What number has 2 tens and 2 ones? = 22 (T) · What number has 2 tens and 6 ones? = 26 (W) · What number has 9 tens and 8 ones? = 98 (L) · What number has 7 tens and 9 ones? = 79 (O) · What number has 5 tens and 0 ones? = 50 (F) · What number has 8 tens and 7 ones? = 87 (M) · What number has 8 tens and 6 ones? = 86 (H) · What number has 8 tens and 4 ones? = 84 (B) · What number has 8 tens and 2 ones? = 82 (S) · What number has 4 tens and 8 ones? = 48 (N) · What number has 7 tens and 2 ones? = 72 (E) · What number has 3 tens and 8 ones? = 38 (D) · What number has 1 ten and 7 ones? = 17 (I)
- Clue 5 (Missing addends): surviving statement (box 7) → Max8 + ___ = 19 = 11 · 1 + ___ = 6 = 5 · 6 + ___ = 15 = 9 · 4 + ___ = 8 = 4 · 4 + ___ = 10 = 6 · 8 + ___ = 18 = 10 · 3 + ___ = 6 = 3 · 5 + ___ = 6 = 1 · 6 + ___ = 8 = 2 · 5 + ___ = 17 = 12 · 1 + ___ = 9 = 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 Mystery at Adventure Camp — set in Adventure Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects