Grade 2Reading: grades 3-4SubtractionPlace valueAdditionSkip countingMissing addends
The Mystery of the Emerald Idol
Someone snuck into the lodge and took the ancient Emerald Idol! Help the detective team track down the thief before the boat leaves the island.
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 | Special Gear | Jungle Skill | Habit | Hat Color | Fear |
|---|---|---|---|---|---|
| Owen Reef | Compass Watch | Track Finding | Left Handed | Brown Cap | Bright Light |
| Nora Vale | Metal Detector | Map Reading | Right Handed | Brown Cap | Loud Noise |
| Lily Grove | Metal Detector | Raft Steering | Right Handed | Green Cap | Bright Light |
| Leo Swift | Metal Detector | Track Finding | Left Handed | Red Cap | Soggy Boots |
| Ruby Marsh | Metal Detector | Tree Climbing | Right Handed | Red Cap | Soggy Boots |
| Tara Fern | Flashlight Lens | Tree Climbing | Left Handed | Red Cap | Soggy Boots |
| Max Ridge | Rope Launcher | Raft Steering | Left Handed | Brown Cap | Soggy Boots |
| Ivy Lake | Grappling Hook | Map Reading | Left Handed | Green Cap | Bright Light |
| Ava Brook | Metal Detector | Tree Climbing | Left Handed | Green Cap | Bright Light |
| Mason Bay | Compass Watch | Vine Swinging | Right Handed | Brown Cap | Bright Light |
| Noah Peak | Metal Detector | Vine Swinging | Right Handed | Brown Cap | Bright Light |
| Luke Cove | Rope Launcher | Vine Swinging | Right Handed | Brown Cap | Bright Light |
| Finn Pine | Grappling Hook | Raft Steering | Right Handed | Brown Cap | Loud Noise |
| Maya Cruz | Metal Detector | Tree Climbing | Right Handed | Brown Cap | Bright Light |
| Sienna Dune | Metal Detector | Tree Climbing | Left Handed | Brown Cap | Bright Light |
| Sam River | Metal Detector | Map Reading | Right Handed | Green Cap | Loud Noise |
| Jack Glen | Rope Launcher | Track Finding | Right Handed | Red Cap | Bright Light |
| Caleb Cliff | Flashlight Lens | Track Finding | Right Handed | Brown Cap | Bright Light |
| Ben Woods | Rope Launcher | Raft Steering | Left Handed | Red Cap | Bright Light |
| Eli Field | Grappling Hook | Map Reading | Left Handed | Brown Cap | Bright Light |
| Mia Coast | Grappling Hook | Vine Swinging | Right Handed | Red Cap | Loud Noise |
Clue 1
Subtraction
The detective compares the total number of footprints found outside with the ones inside to see how many extra steps were 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
30
53
29
15
60
18
18
21
60
82
71
80
29
39
82
80
T
30
53
21
15
29
T
30
46
29
29
69
18
60
43
56
60
82
81
39
68
60
18
18
39
42 - 12 =T
65 - 19 =R
53 - 24 =E
27 - 9 =L
95 - 35 =I
58 - 5 =H
102 - 33 =C
67 - 11 =B
43 - 28 =V
107 - 39 =K
97 - 15 =N
116 - 35 =G
51 - 8 =M
106 - 35 =D
94 - 14 =O
41 - 2 =S
55 - 34 =A
0/17 letters found
Clue 2
Place value
The detective looks at the tens and ones written on the supply chest lock to decode the secret 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
21
17
92
98
90
98
82
92
68
T
21
34
69
98
98
92
92
65
90
98
76
65
35
T
21
17
92
76
39
39
76
35
17
T
21
17
69
65
30
What number has 2 tens and 1 one?T
What number has 3 tens and 5 ones?G
What number has 8 tens and 2 ones?P
What number has 6 tens and 8 ones?C
What number has 7 tens and 6 ones?I
What number has 9 tens and 0 ones?U
What number has 6 tens and 5 ones?N
What number has 9 tens and 2 ones?E
What number has 3 tens and 9 ones?R
What number has 3 tens and 0 ones?D
What number has 1 ten and 7 ones?H
What number has 6 tens and 9 ones?A
What number has 3 tens and 4 ones?W
What number has 9 tens and 8 ones?S
0/14 letters found
Clue 3
Addition
The detective adds up all the lost flashlight batteries found along the 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.
A
53
73
93
82
64
82
64
92
22
90
85
41
93
24
85
90
49
23
22
93
23
56
82
37
37
A
53
82
64
38 + 15 =A
11 + 13 =F
14 + 8 =T
45 + 40 =R
61 + 31 =G
63 + 27 =O
30 + 34 =N
14 + 35 =Z
23 + 18 =C
30 + 26 =V
52 + 21 =S
7 + 16 =E
34 + 48 =I
17 + 20 =L
58 + 35 =H
0/15 letters found
Clue 4
Skip counting
The detective counts the tally marks left on the tree trunks by twos to trace 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.
B
10
33
18
9
27
26
45
33
6
80
65
120
9
6
33
6
40
18
55
27
65
18
27
26
45
6
B
10
33
80
27
8
45
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14B
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50F
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, ___, 130, 140S
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33N
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30T
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65U
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55H
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12C
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10E
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39R
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15W
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75D
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24O
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100A
0/14 letters found
Clue 5
Missing addends — the last clue
The detective checks how many shiny coins are left in the pouch to find out how many were taken.
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 + ___ = 14
8 + ___ = 16
2 + ___ = 8
2 + ___ = 7
5 + ___ = 9
7 + ___ = 8
7 + ___ = 17
10 + ___ = 21
9 + ___ = 11
5 + ___ = 14
10 + ___ = 13
Step 2 — cross out the sentence with each answer
1.The villain swung across the camp on a grappling hook, then guided the path by reading maps.
2.The villain snared a wooden crate using a rope launcher, then steered a log raft down the rapid river.
3.The villain snared a wooden crate using a rope launcher, then guided the path by reading maps.
4.The villain checked directions with a compass watch, then guided the path by reading maps.
5.The villain scanned the ground with a metal detector, then climbed high up into the palm trees.
6.The villain flashed a bright beam using a flashlight lens, then followed footprints across the muddy dirt.
7.The villain snared a wooden crate using a rope launcher, then swung through the canopy vines.
8.The villain scanned the ground with a metal detector, then swung through the canopy vines.
9.The villain flashed a bright beam using a flashlight lens, then steered a log raft down the rapid river.
10.The villain checked directions with a compass watch, then climbed high up into the palm trees.
11.The villain flashed a bright beam using a flashlight lens, then guided the path by reading maps.
12.The villain checked directions with a compass watch, then swung through the canopy vines.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Emerald Idol
Culprit: Mason Bay (Compass Watch · Vine Swinging · Right Handed · Brown Cap · Bright Light)
- Clue 1 (Subtraction): "THE VILLAIN DOES NOT HAVE TREE CLIMBING SKILLS"42 - 12 = 30 (T) · 65 - 19 = 46 (R) · 53 - 24 = 29 (E) · 27 - 9 = 18 (L) · 95 - 35 = 60 (I) · 58 - 5 = 53 (H) · 102 - 33 = 69 (C) · 67 - 11 = 56 (B) · 43 - 28 = 15 (V) · 107 - 39 = 68 (K) · 97 - 15 = 82 (N) · 116 - 35 = 81 (G) · 51 - 8 = 43 (M) · 106 - 35 = 71 (D) · 94 - 14 = 80 (O) · 41 - 2 = 39 (S) · 55 - 34 = 21 (A)
- Clue 2 (Place value): "THE SUSPECT WAS SEEN USING THEIR RIGHT HAND"What number has 2 tens and 1 one? = 21 (T) · What number has 3 tens and 5 ones? = 35 (G) · What number has 8 tens and 2 ones? = 82 (P) · What number has 6 tens and 8 ones? = 68 (C) · What number has 7 tens and 6 ones? = 76 (I) · What number has 9 tens and 0 ones? = 90 (U) · What number has 6 tens and 5 ones? = 65 (N) · What number has 9 tens and 2 ones? = 92 (E) · What number has 3 tens and 9 ones? = 39 (R) · What number has 3 tens and 0 ones? = 30 (D) · What number has 1 ten and 7 ones? = 17 (H) · What number has 6 tens and 9 ones? = 69 (A) · What number has 3 tens and 4 ones? = 34 (W) · What number has 9 tens and 8 ones? = 98 (S)
- Clue 3 (Addition): "A SHINING TORCH FROZE THE VILLAIN"38 + 15 = 53 (A) · 11 + 13 = 24 (F) · 14 + 8 = 22 (T) · 45 + 40 = 85 (R) · 61 + 31 = 92 (G) · 63 + 27 = 90 (O) · 30 + 34 = 64 (N) · 14 + 35 = 49 (Z) · 23 + 18 = 41 (C) · 30 + 26 = 56 (V) · 52 + 21 = 73 (S) · 7 + 16 = 23 (E) · 34 + 48 = 82 (I) · 17 + 20 = 37 (L) · 58 + 35 = 93 (H)
- Clue 4 (Skip counting): "BROWN THREADS WERE FOUND ON THE BRANCH"Skip-count by 2s. Fill the blank: 2, 4, 6, 8, ___, 12, 14 = 10 (B) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, ___, 45, 50 = 40 (F) · 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 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (N) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (T) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (U) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (H) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (C) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (E) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ___, 36, 39 = 33 (R) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (W) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, ___, 70, 75 = 65 (D) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (O) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, ___, 90, 100 = 80 (A)
- Clue 5 (Missing addends): surviving statement (box 12) → Mason Bay7 + ___ = 14 = 7 · 8 + ___ = 16 = 8 · 2 + ___ = 8 = 6 · 2 + ___ = 7 = 5 · 5 + ___ = 9 = 4 · 7 + ___ = 8 = 1 · 7 + ___ = 17 = 10 · 10 + ___ = 21 = 11 · 9 + ___ = 11 = 2 · 5 + ___ = 14 = 9 · 10 + ___ = 13 = 3
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Subtraction, Place value, Addition, Skip counting, Missing addends
- Reading level
- grades 3-4
- Theme
- The Mystery of the Emerald Idol — set in Jungle Island Camp
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects