Grade 2Reading: grades 1-2Skip countingMultiplicationAdditionSubtractionMissing addends
The Secret Island Map Mystery
The camp captain lost the gold map. The sneaky map snatcher took it. We must find the map before the sun goes down.
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 | Camp Skill | Favorite Tool | Active Hand | Cap Color | Favorite Treat |
|---|---|---|---|---|---|
| Cody | trail marking | yellow whistle | right handed | red cap | apple slices |
| Ruby | rope climbing | yellow whistle | right handed | green cap | sweet cookies |
| Sam | rope climbing | shiny spyglass | right handed | red cap | juice boxes |
| Jake | trail marking | loud megaphone | left handed | blue cap | sweet cookies |
| Dora | trail marking | shiny spyglass | right handed | green cap | sweet cookies |
| Ella | tree gliding | yellow whistle | right handed | green cap | apple slices |
| Toby | fast running | super flashlight | right handed | red cap | juice boxes |
| Noah | rope climbing | shiny spyglass | right handed | green cap | apple slices |
| Bindi | tree gliding | super flashlight | right handed | red cap | sweet cookies |
| Lily | rope climbing | yellow whistle | right handed | red cap | apple slices |
| Luke | deep digging | loud megaphone | left handed | green cap | sweet cookies |
| Jane | tree gliding | super flashlight | left handed | blue cap | sweet cookies |
| Diego | fast running | yellow whistle | left handed | green cap | apple slices |
| Mia | rope climbing | shiny spyglass | right handed | green cap | sweet cookies |
| Ben | rope climbing | super flashlight | left handed | red cap | apple slices |
| Zoe | deep digging | yellow whistle | right handed | green cap | juice boxes |
| Steve | fast running | loud megaphone | left handed | blue cap | sweet cookies |
| Finn | deep digging | super flashlight | right handed | blue cap | sweet cookies |
| Jack | fast running | shiny spyglass | right handed | green cap | sweet cookies |
| Max | trail marking | glow compass | right handed | green cap | sweet cookies |
| Leo | deep digging | yellow whistle | left handed | blue cap | juice boxes |
Clue 1
Skip counting
We find footprints on the beach. We skip count them by twos to see how far they 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
39
27
140
120
24
140
40
42
18
20
24
140
6
20
140
120
24
20
T
39
80
120
140
40
9
16
20
12
65
20
14
70
40
120
120
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45T
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20L
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160E
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24O
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18W
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90P
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, 22, ___, 26, 28N
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15G
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18M
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75C
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100U
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22Y
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, ___, 45, 50A
0/17 letters found
Clue 2
Multiplication facts (1-12)
We find boxes of gear. Each box has five shiny walkie talkies. We multiply to find 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
63
99
132
25
40
16
16
12
40
6
77
14
40
T
63
132
4
77
40
T
63
99
T
63
99
132
40
14
14
40
88
99
T
63
99
12
6
22
9 × 7 =T
8 × 2 =L
1 × 6 =N
11 × 9 =H
8 × 11 =G
7 × 11 =W
5 × 8 =I
11 × 2 =D
11 × 12 =E
5 × 5 =V
1 × 12 =A
7 × 2 =R
1 × 4 =S
0/13 letters found
Clue 3
Addition
We pack our bags for the hike. We add the old ropes and the new ropes 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.
W
60
74
71
72
89
29
33
85
W
60
74
74
42
54
72
72
76
87
74
54
35
89
38
69
85
87
29
42
86
74
33
87
35
42
20 + 40 =W
33 + 53 =H
49 + 38 =I
48 + 21 =B
30 + 42 =O
59 + 26 =S
59 + 30 =U
43 + 28 =F
42 + 34 =K
52 + 22 =E
10 + 19 =N
25 + 29 =C
23 + 15 =M
24 + 11 =R
23 + 19 =T
12 + 21 =D
0/16 letters found
Clue 4
Subtraction
We had many juice boxes. Some kids drank some. We subtract to see how many are left.
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
69
40
61
84
84
27
22
A
69
39
64
A
69
36
29
84
32
14
37
27
14
71
84
40
61
A
69
36
36
101 - 32 =A
53 - 39 =T
63 - 23 =G
114 - 30 =E
39 - 3 =S
62 - 30 =F
53 - 24 =L
77 - 13 =W
46 - 19 =N
67 - 6 =R
45 - 23 =C
74 - 35 =P
88 - 17 =H
47 - 10 =O
0/14 letters found
Clue 5
Missing addends — the last clue
We need ten camp flags to win the game. We have six. We find the missing number.
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
7 + ___ = 19
4 + ___ = 11
4 + ___ = 10
2 + ___ = 3
5 + ___ = 14
2 + ___ = 13
1 + ___ = 5
9 + ___ = 14
2 + ___ = 10
6 + ___ = 8
9 + ___ = 12
Step 2 — cross out the sentence with each answer
1.The villain runs fast down the trail, then blows a yellow whistle.
2.The villain leaves a trail of marks, then checks a glow compass.
3.The villain climbs up high trees, then shines a super flashlight.
4.The villain digs deep holes in the dirt, then shines a super flashlight.
5.The villain digs deep holes in the dirt, then checks a glow compass.
6.The villain runs fast down the trail, then looks through a shiny spyglass.
7.The villain climbs up high trees, then blows a yellow whistle.
8.The villain leaves a trail of marks, then blows a yellow whistle.
9.The villain climbs up high trees, then shouts into a loud megaphone.
10.The villain leaves a trail of marks, then looks through a shiny spyglass.
11.The villain leaves a trail of marks, then shouts into a loud megaphone.
12.The villain climbs up high trees, then looks through a shiny spyglass.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Secret Island Map Mystery
Culprit: Dora (trail marking · shiny spyglass · right handed · green cap · sweet cookies)
- Clue 1 (Skip counting): "THE SNEAKY ONE DOES NOT USE A GLOW COMPASS"Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, ___, 42, 45 = 39 (T) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (L) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (E) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140 = 120 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, ___, 22, 24 = 20 (O) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (W) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (P) · 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, 22, ___, 26, 28 = 24 (N) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (G) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (M) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (C) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (U) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, ___, 20, 22 = 18 (Y) · 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, ___, 45, 50 = 40 (A)
- Clue 2 (Multiplication facts (1-12)): "THE VILLAIN WRITES WITH THEIR RIGHT HAND"9 × 7 = 63 (T) · 8 × 2 = 16 (L) · 1 × 6 = 6 (N) · 11 × 9 = 99 (H) · 8 × 11 = 88 (G) · 7 × 11 = 77 (W) · 5 × 8 = 40 (I) · 11 × 2 = 22 (D) · 11 × 12 = 132 (E) · 5 × 5 = 25 (V) · 1 × 12 = 12 (A) · 7 × 2 = 14 (R) · 1 × 4 = 4 (S)
- Clue 3 (Addition): "WE FOUND SWEET COOKIE CRUMBS IN THE DIRT"20 + 40 = 60 (W) · 33 + 53 = 86 (H) · 49 + 38 = 87 (I) · 48 + 21 = 69 (B) · 30 + 42 = 72 (O) · 59 + 26 = 85 (S) · 59 + 30 = 89 (U) · 43 + 28 = 71 (F) · 42 + 34 = 76 (K) · 52 + 22 = 74 (E) · 10 + 19 = 29 (N) · 25 + 29 = 54 (C) · 23 + 15 = 38 (M) · 24 + 11 = 35 (R) · 23 + 19 = 42 (T) · 12 + 21 = 33 (D)
- Clue 4 (Subtraction): "A GREEN CAP WAS LEFT ON THE GRASS"101 - 32 = 69 (A) · 53 - 39 = 14 (T) · 63 - 23 = 40 (G) · 114 - 30 = 84 (E) · 39 - 3 = 36 (S) · 62 - 30 = 32 (F) · 53 - 24 = 29 (L) · 77 - 13 = 64 (W) · 46 - 19 = 27 (N) · 67 - 6 = 61 (R) · 45 - 23 = 22 (C) · 74 - 35 = 39 (P) · 88 - 17 = 71 (H) · 47 - 10 = 37 (O)
- Clue 5 (Missing addends): surviving statement (box 10) → Dora7 + ___ = 19 = 12 · 4 + ___ = 11 = 7 · 4 + ___ = 10 = 6 · 2 + ___ = 3 = 1 · 5 + ___ = 14 = 9 · 2 + ___ = 13 = 11 · 1 + ___ = 5 = 4 · 9 + ___ = 14 = 5 · 2 + ___ = 10 = 8 · 6 + ___ = 8 = 2 · 9 + ___ = 12 = 3
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Skip counting, Multiplication, Addition, Subtraction, Missing addends
- Reading level
- grades 1-2
- Theme
- The Secret Island Map Mystery — set in Adventure Island Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects