Grade 2Reading: grades 1-2Place valueAdditionSubtractionSkip countingMissing addends
The Case of the Missing Golden Idol
Oh no! Someone took the golden tiki idol from the camp! You must help the junior explorers find the Sneaky Bandit before they sail away!
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 Used | Secret Item | Writing Hand | Hair Color | Big Fear |
|---|---|---|---|---|---|
| Alex | climbing spikes | shiny gold medal | right handed writer | bright yellow hair | afraid of heights |
| Ben | pocket spyglass | secret decoder whistle | left handed writer | dark brown hair | afraid of the dark |
| Noah | glow in the dark map | secret decoder whistle | left handed writer | bright red hair | afraid of heights |
| Hope | glow in the dark map | magnifying glass | left handed writer | bright red hair | afraid of the dark |
| Kai | climbing spikes | magnifying glass | left handed writer | dark brown hair | afraid of the dark |
| Ruby | jungle canteen | sparkly blue gem | left handed writer | bright red hair | afraid of the dark |
| Dan | climbing spikes | dinosaur fossil | left handed writer | dark brown hair | afraid of spiders |
| Fay | pocket spyglass | dinosaur fossil | right handed writer | bright yellow hair | afraid of heights |
| Ian | glow in the dark map | secret decoder whistle | right handed writer | bright red hair | afraid of the dark |
| Owen | glow in the dark map | magnifying glass | left handed writer | bright red hair | afraid of heights |
| Sam | grappling hook | dinosaur fossil | left handed writer | dark brown hair | afraid of the dark |
| Will | glow in the dark map | magnifying glass | left handed writer | bright yellow hair | afraid of heights |
| Leo | grappling hook | magnifying glass | right handed writer | bright yellow hair | afraid of spiders |
| Toby | pocket spyglass | magnifying glass | left handed writer | bright red hair | afraid of the dark |
| Pip | grappling hook | shiny gold medal | left handed writer | bright red hair | afraid of the dark |
| Emma | climbing spikes | sparkly blue gem | right handed writer | dark brown hair | afraid of heights |
| Zoe | jungle canteen | secret decoder whistle | left handed writer | bright red hair | afraid of spiders |
| Mia | climbing spikes | dinosaur fossil | right handed writer | bright red hair | afraid of the dark |
| Val | glow in the dark map | dinosaur fossil | left handed writer | dark brown hair | afraid of spiders |
| Cole | pocket spyglass | secret decoder whistle | left handed writer | bright red hair | afraid of spiders |
| Uma | glow in the dark map | secret decoder whistle | left handed writer | bright red hair | afraid of the dark |
Clue 1
Place value
We found a locked treasure box. The code on the lock has two tens and four ones. Let us find the code to get 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
98
24
88
34
45
46
46
39
45
55
85
97
88
89
55
97
T
98
24
39
34
88
T
98
24
88
89
65
39
81
12
46
11
99
46
78
88
57
88
42
What number has 9 tens and 8 ones?T
What number has 1 ten and 1 one?Y
What number has 7 tens and 8 ones?U
What number has 3 tens and 9 ones?A
What number has 6 tens and 5 ones?P
What number has 8 tens and 1 one?R
What number has 2 tens and 4 ones?H
What number has 1 ten and 2 ones?K
What number has 8 tens and 5 ones?D
What number has 9 tens and 9 ones?B
What number has 5 tens and 5 ones?N
What number has 4 tens and 2 ones?M
What number has 8 tens and 9 ones?S
What number has 9 tens and 7 ones?O
What number has 3 tens and 4 ones?V
What number has 4 tens and 5 ones?I
What number has 8 tens and 8 ones?E
What number has 4 tens and 6 ones?L
What number has 5 tens and 7 ones?G
0/19 letters found
Clue 2
Addition
There are five gold coins on the grass and six more by the tree. Add them up to count the path markers for our next 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
71
65
34
68
34
91
T
71
65
67
63
97
34
97
58
41
72
T
71
34
41
68
34
91
T
71
67
79
31
86
97
42
34
23 + 48 =T
34 + 24 =W
40 + 28 =L
43 + 48 =F
38 + 59 =D
14 + 27 =R
46 + 33 =S
30 + 37 =A
37 + 35 =I
17 + 14 =M
23 + 40 =N
14 + 20 =E
35 + 30 =H
25 + 61 =U
20 + 22 =G
0/15 letters found
Clue 3
Subtraction
We had twelve shiny rocks but three fell into the river. Subtract the lost rocks to see how many we have left for the next 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
39
36
50
35
68
15
15
81
68
75
36
81
46
T
39
79
47
50
50
72
81
38
15
81
25
36
15
68
87
36
T
39
79
75
74 - 35 =T
92 - 17 =N
113 - 34 =O
79 - 7 =P
115 - 34 =A
43 - 8 =V
92 - 24 =I
58 - 33 =S
115 - 28 =G
52 - 6 =D
66 - 16 =E
39 - 1 =F
86 - 39 =K
47 - 32 =L
68 - 32 =H
0/15 letters found
Clue 4
Skip counting
We must step on every second stone to cross the muddy swamp. Count by twos to find the safe path and get the next 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.
A
30
8
100
40
6
27
24
100
26
45
27
A
30
40
100
36
A
30
42
28
26
140
24
40
14
24
27
26
16
A
30
55
26
Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42W
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20C
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33H
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 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65V
Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60I
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160F
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18N
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48S
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30E
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28T
Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10G
Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12B
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120R
0/16 letters found
Clue 5
Missing addends — the last clue
We need ten camp torches but we only have seven right now. Find how many more torches we need to light the cave for our last clue.
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
2 + ___ = 14
1 + ___ = 8
8 + ___ = 17
6 + ___ = 11
9 + ___ = 11
9 + ___ = 20
3 + ___ = 4
2 + ___ = 10
3 + ___ = 13
2 + ___ = 5
1 + ___ = 7
Step 2 — cross out the sentence with each answer
1.The villain looked through a pocket spyglass at the temple, then blew a secret decoder whistle to open the door.
2.The villain clamped on climbing spikes to scale the cliff, then blew a secret decoder whistle to open the door.
3.The villain clamped on climbing spikes to scale the cliff, then dug up a dinosaur fossil near the river.
4.The villain used a grappling hook to scale the high stone wall, then dropped a shiny gold medal in the mud.
5.The villain used a grappling hook to scale the high stone wall, then polished a sparkly blue gem in the sunlight.
6.The villain looked through a pocket spyglass at the temple, then dug up a dinosaur fossil near the river.
7.The villain checked a glow in the dark map under the trees, then used a magnifying glass to read the ancient glyphs.
8.The villain looked through a pocket spyglass at the temple, then dropped a shiny gold medal in the mud.
9.The villain checked a glow in the dark map under the trees, then blew a secret decoder whistle to open the door.
10.The villain checked a glow in the dark map under the trees, then polished a sparkly blue gem in the sunlight.
11.The villain checked a glow in the dark map under the trees, then dug up a dinosaur fossil near the river.
12.The villain looked through a pocket spyglass at the temple, then used a magnifying glass to read the ancient glyphs.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Golden Idol
Culprit: Pip (grappling hook · shiny gold medal · left handed writer · bright red hair · afraid of the dark)
- Clue 1 (Place value): "THE VILLAIN DOES NOT HAVE THE SPARKLY BLUE GEM"What number has 9 tens and 8 ones? = 98 (T) · What number has 1 ten and 1 one? = 11 (Y) · What number has 7 tens and 8 ones? = 78 (U) · What number has 3 tens and 9 ones? = 39 (A) · What number has 6 tens and 5 ones? = 65 (P) · What number has 8 tens and 1 one? = 81 (R) · What number has 2 tens and 4 ones? = 24 (H) · What number has 1 ten and 2 ones? = 12 (K) · What number has 8 tens and 5 ones? = 85 (D) · What number has 9 tens and 9 ones? = 99 (B) · What number has 5 tens and 5 ones? = 55 (N) · What number has 4 tens and 2 ones? = 42 (M) · What number has 8 tens and 9 ones? = 89 (S) · What number has 9 tens and 7 ones? = 97 (O) · What number has 3 tens and 4 ones? = 34 (V) · What number has 4 tens and 5 ones? = 45 (I) · What number has 8 tens and 8 ones? = 88 (E) · What number has 4 tens and 6 ones? = 46 (L) · What number has 5 tens and 7 ones? = 57 (G)
- Clue 2 (Addition): "THE LEFT HANDED WRITER LEFT A SMUDGE"23 + 48 = 71 (T) · 34 + 24 = 58 (W) · 40 + 28 = 68 (L) · 43 + 48 = 91 (F) · 38 + 59 = 97 (D) · 14 + 27 = 41 (R) · 46 + 33 = 79 (S) · 30 + 37 = 67 (A) · 37 + 35 = 72 (I) · 17 + 14 = 31 (M) · 23 + 40 = 63 (N) · 14 + 20 = 34 (E) · 35 + 30 = 65 (H) · 25 + 61 = 86 (U) · 20 + 22 = 42 (G)
- Clue 3 (Subtraction): "THE VILLAIN HAD TO KEEP A FLASHLIGHT ON"74 - 35 = 39 (T) · 92 - 17 = 75 (N) · 113 - 34 = 79 (O) · 79 - 7 = 72 (P) · 115 - 34 = 81 (A) · 43 - 8 = 35 (V) · 92 - 24 = 68 (I) · 58 - 33 = 25 (S) · 115 - 28 = 87 (G) · 52 - 6 = 46 (D) · 66 - 16 = 50 (E) · 39 - 1 = 38 (F) · 86 - 39 = 47 (K) · 47 - 32 = 15 (L) · 68 - 32 = 36 (H)
- Clue 4 (Skip counting): "A BRIGHT RED HAIR WAS LEFT IN THE CAVE"Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50 = 30 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, ___, 39, 42 = 36 (W) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, ___, 18, 20 = 16 (C) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (H) · 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 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (V) · Skip-count by 10s. Fill the blank: 10, 20, 30, ___, 50, 60 = 40 (I) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (F) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, ___, 50, 55 = 45 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (N) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, ___, 45, 48 = 42 (S) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ___, 28, 30 = 26 (E) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, ___, 26, 28 = 24 (T) · Skip-count by 2s. Fill the blank: 2, 4, ___, 8, 10 = 6 (G) · Skip-count by 2s. Fill the blank: 2, 4, 6, ___, 10, 12 = 8 (B) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (R)
- Clue 5 (Missing addends): surviving statement (box 4) → Pip2 + ___ = 14 = 12 · 1 + ___ = 8 = 7 · 8 + ___ = 17 = 9 · 6 + ___ = 11 = 5 · 9 + ___ = 11 = 2 · 9 + ___ = 20 = 11 · 3 + ___ = 4 = 1 · 2 + ___ = 10 = 8 · 3 + ___ = 13 = 10 · 2 + ___ = 5 = 3 · 1 + ___ = 7 = 6
About this mystery
- Grade level
- Grade 2 math
- Math topics
- Place value, Addition, Subtraction, Skip counting, Missing addends
- Reading level
- grades 1-2
- Theme
- The Case of the Missing Golden Idol — set in The Lost Island of Adventure
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects