Grade 1Reading: grades 3-4AdditionSubtractionSkip countingPlace valueMissing addends
Mystery of the Golden Monkey
The Golden Monkey Statue has vanished from the jungle base camp! Only a master explorer could have bypassed our camp security. Join the Junior Explorers as we search the deep jungle, follow the trail of clues, and recover the priceless relic before the robber escapes!
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 | Jungle Skill | Pocket Tool | Handedness | Gear | Fear |
|---|---|---|---|---|---|
| Sierra Snow | grappling hook swinging | metal canteen | right handed tool grip | green headband | dislikes mosquitoes |
| Marina Wave | grappling hook swinging | leather notepad | left handed tool grip | green headband | scared of spiders |
| Piper Pine | spyglass scouting | shiny compass | right handed tool grip | explorer cap | hates sticky mud |
| Lara Finch | thick brush clearing | bright flashlight | right handed tool grip | pith helmet | hates sticky mud |
| Sally Swift | ancient map reading | shiny compass | right handed tool grip | explorer cap | scared of spiders |
| Toby Trail | grappling hook swinging | loud whistle | right handed tool grip | pith helmet | dislikes mosquitoes |
| Ryder Cruz | ancient map reading | loud whistle | left handed tool grip | explorer cap | scared of spiders |
| Scout Miller | thick brush clearing | bright flashlight | right handed tool grip | explorer cap | dislikes mosquitoes |
| Chase Sterling | grappling hook swinging | metal canteen | right handed tool grip | explorer cap | hates sticky mud |
| Bindi Rivers | giant wall climbing | leather notepad | right handed tool grip | pith helmet | dislikes mosquitoes |
| Rusty Ridge | ancient map reading | metal canteen | right handed tool grip | green headband | scared of spiders |
| Cliff Mason | spyglass scouting | shiny compass | right handed tool grip | green headband | scared of spiders |
| Flint Forge | ancient map reading | leather notepad | right handed tool grip | pith helmet | scared of spiders |
| Daisy Vance | thick brush clearing | bright flashlight | right handed tool grip | pith helmet | dislikes mosquitoes |
| Kit Campbell | thick brush clearing | leather notepad | left handed tool grip | pith helmet | dislikes mosquitoes |
| Oakly Green | grappling hook swinging | bright flashlight | right handed tool grip | green headband | scared of spiders |
| Dallas Dune | thick brush clearing | loud whistle | right handed tool grip | explorer cap | dislikes mosquitoes |
| Wilder Smith | giant wall climbing | metal canteen | right handed tool grip | pith helmet | dislikes mosquitoes |
| Leo Stone | grappling hook swinging | metal canteen | left handed tool grip | explorer cap | scared of spiders |
| Penny Peak | spyglass scouting | loud whistle | right handed tool grip | green headband | scared of spiders |
| Rex Rock | ancient map reading | shiny compass | right handed tool grip | pith helmet | dislikes mosquitoes |
Clue 1
Addition
To find the first trail marker, we must add up all the heavy supply crates left at our river camp.
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
18
13
2
12
3
4
5
14
2
T
18
13
9
2
6
13
15
8
4
11
16
2
T
18
15
14
19
15
4
T
18
2
2
4
11 + 7 =T
10 + 5 =A
3 + 1 =N
4 + 2 =F
4 + 1 =G
9 + 3 =J
2 + 1 =U
3 + 8 =O
4 + 5 =I
10 + 3 =H
1 + 1 =E
10 + 9 =C
2 + 6 =S
9 + 7 =M
6 + 8 =L
0/15 letters found
Clue 2
Subtraction
A cheeky monkey stole some of our maps along the path, so we have to subtract them to see what is 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.
T
18
17
12
2
8
14
15
16
6
8
4
10
6
9
16
6
13
12
11
3
6
8
14
2
17
T
18
3
19 - 1 =T
17 - 9 =R
20 - 8 =E
17 - 7 =W
19 - 8 =B
18 - 4 =I
17 - 2 =P
10 - 6 =K
11 - 2 =S
10 - 7 =Y
12 - 6 =A
19 - 2 =H
6 - 4 =G
19 - 3 =M
18 - 5 =D
0/15 letters found
Clue 3
Skip counting
We need to climb the temple steps, skip counting the stone slabs by fives to avoid setting off any ancient dart traps.
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
110
27
30
T
110
27
100
30
90
28
140
30
60
70
35
T
110
140
35
90
12
28
55
140
15
18
14
9
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130T
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21P
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18A
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24R
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120I
Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18B
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160S
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110F
Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33H
Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15Y
Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90L
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45O
Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50E
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65G
Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70D
Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32U
0/16 letters found
Clue 4
Place value
The dusty decoder lock on the stone chest uses tens and ones to reveal 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.
W
80
93
92
11
23
40
83
81
84
47
38
75
75
93
43
58
93
38
55
38
60
81
84
What number has 8 tens and 0 ones?W
What number has 8 tens and 4 ones?P
What number has 8 tens and 3 ones?D
What number has 5 tens and 8 ones?M
What number has 2 tens and 3 ones?U
What number has 9 tens and 2 ones?F
What number has 6 tens and 0 ones?R
What number has 4 tens and 7 ones?I
What number has 9 tens and 3 ones?E
What number has 1 ten and 1 one?O
What number has 4 tens and 3 ones?L
What number has 8 tens and 1 one?A
What number has 3 tens and 8 ones?T
What number has 4 tens and 0 ones?N
What number has 7 tens and 5 ones?H
What number has 5 tens and 5 ones?S
0/16 letters found
Clue 5
Missing addends — the last clue
We must balance the ancient stone scale by figuring out how many more heavy rocks we need to add to the plate.
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
4 + ___ = 6
9 + ___ = 16
5 + ___ = 6
7 + ___ = 18
9 + ___ = 14
8 + ___ = 16
9 + ___ = 12
3 + ___ = 15
3 + ___ = 12
1 + ___ = 11
8 + ___ = 12
Step 2 — cross out the sentence with each answer
1.The villain slashed through the thick ferns, then lit up the dark tunnel.
2.The villain climbed up the giant mossy wall, then jotted down a quick clue.
3.The villain climbed up the giant mossy wall, then blew a loud warning signal.
4.The villain spotted the route from a high tree, then took a drink of cool river water.
5.The villain swung across the wide ravine, then jotted down a quick clue.
6.The villain decoded the ancient stone door, then checked the direction north.
7.The villain swung across the wide ravine, then blew a loud warning signal.
8.The villain decoded the ancient stone door, then blew a loud warning signal.
9.The villain swung across the wide ravine, then took a drink of cool river water.
10.The villain swung across the wide ravine, then checked the direction north.
11.The villain slashed through the thick ferns, then checked the direction north.
12.The villain spotted the route from a high tree, then blew a loud warning signal.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — Mystery of the Golden Monkey
Culprit: Rex Rock (ancient map reading · shiny compass · right handed tool grip · pith helmet · dislikes mosquitoes)
- Clue 1 (Addition): "THE JUNGLE THIEF HAS NO METAL CANTEEN"11 + 7 = 18 (T) · 10 + 5 = 15 (A) · 3 + 1 = 4 (N) · 4 + 2 = 6 (F) · 4 + 1 = 5 (G) · 9 + 3 = 12 (J) · 2 + 1 = 3 (U) · 3 + 8 = 11 (O) · 4 + 5 = 9 (I) · 10 + 3 = 13 (H) · 1 + 1 = 2 (E) · 10 + 9 = 19 (C) · 2 + 6 = 8 (S) · 9 + 7 = 16 (M) · 6 + 8 = 14 (L)
- Clue 2 (Subtraction): "THE GRIP MARK WAS MADE BY A RIGHTY"19 - 1 = 18 (T) · 17 - 9 = 8 (R) · 20 - 8 = 12 (E) · 17 - 7 = 10 (W) · 19 - 8 = 11 (B) · 18 - 4 = 14 (I) · 17 - 2 = 15 (P) · 10 - 6 = 4 (K) · 11 - 2 = 9 (S) · 10 - 7 = 3 (Y) · 12 - 6 = 6 (A) · 19 - 2 = 17 (H) · 6 - 4 = 2 (G) · 19 - 3 = 16 (M) · 18 - 5 = 13 (D)
- Clue 3 (Skip counting): "THE THIEF USED LOTS OF BUG SPRAY"Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, ___, 120, 130 = 110 (T) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, ___, 18, 21 = 15 (P) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, ___, 16, 18 = 14 (A) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, ___, 21, 24 = 18 (R) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, ___, 110, 120 = 100 (I) · Skip-count by 3s. Fill the blank: 3, 6, 9, ___, 15, 18 = 12 (B) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, ___, 150, 160 = 140 (S) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, 70, 80, ___, 100, 110 = 90 (F) · Skip-count by 3s. Fill the blank: 3, 6, 9, 12, 15, 18, 21, 24, ___, 30, 33 = 27 (H) · Skip-count by 3s. Fill the blank: 3, 6, ___, 12, 15 = 9 (Y) · Skip-count by 10s. Fill the blank: 10, 20, 30, 40, 50, 60, ___, 80, 90 = 70 (L) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, ___, 40, 45 = 35 (O) · Skip-count by 10s. Fill the blank: 10, 20, ___, 40, 50 = 30 (E) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ___, 60, 65 = 55 (G) · Skip-count by 5s. Fill the blank: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ___, 65, 70 = 60 (D) · Skip-count by 2s. Fill the blank: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, ___, 30, 32 = 28 (U)
- Clue 4 (Place value): "WE FOUND A PITH HELMET STRAP"What number has 8 tens and 0 ones? = 80 (W) · What number has 8 tens and 4 ones? = 84 (P) · What number has 8 tens and 3 ones? = 83 (D) · What number has 5 tens and 8 ones? = 58 (M) · What number has 2 tens and 3 ones? = 23 (U) · What number has 9 tens and 2 ones? = 92 (F) · What number has 6 tens and 0 ones? = 60 (R) · What number has 4 tens and 7 ones? = 47 (I) · What number has 9 tens and 3 ones? = 93 (E) · What number has 1 ten and 1 one? = 11 (O) · What number has 4 tens and 3 ones? = 43 (L) · What number has 8 tens and 1 one? = 81 (A) · What number has 3 tens and 8 ones? = 38 (T) · What number has 4 tens and 0 ones? = 40 (N) · What number has 7 tens and 5 ones? = 75 (H) · What number has 5 tens and 5 ones? = 55 (S)
- Clue 5 (Missing addends): surviving statement (box 6) → Rex Rock4 + ___ = 6 = 2 · 9 + ___ = 16 = 7 · 5 + ___ = 6 = 1 · 7 + ___ = 18 = 11 · 9 + ___ = 14 = 5 · 8 + ___ = 16 = 8 · 9 + ___ = 12 = 3 · 3 + ___ = 15 = 12 · 3 + ___ = 12 = 9 · 1 + ___ = 11 = 10 · 8 + ___ = 12 = 4
About this mystery
- Grade level
- Grade 1 math
- Math topics
- Addition, Subtraction, Skip counting, Place value, Missing addends
- Reading level
- grades 3-4
- Theme
- Mystery of the Golden Monkey — set in The ancient overgrown ruins of the Canopy Kingdom
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects