Grade 7Reading: grades 5-6Fractions of a numberWord problemsMulti-step word problemsMultiplication
The Mystery of the Golden Mask
The golden mask of King Tut-Tut has vanished from the Jungle Museum! A mysterious thief sneaked past the security cameras, grabbed the mask, and escaped into the thick jungle canopy. The Junior Rangers must follow the trail, solve the puzzles, and recover the artifact before it 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 | Adventure Gear | Special Skill | Writing Hand | Cap Color | Fears |
|---|---|---|---|---|---|
| Bindi | mapping drone | code breaking | right handed writer | blue cap | squeaky bats |
| Lewis | laser torch | code breaking | right handed writer | blue cap | sticky sap |
| Zane | brass compass | snake charming | left handed writer | blue cap | tiny spiders |
| Amelia | laser torch | code breaking | left handed writer | red cap | squeaky bats |
| Toby | laser torch | high jumping | right handed writer | red cap | squeaky bats |
| Darwin | brass compass | snake charming | left handed writer | red cap | squeaky bats |
| Brody | grapple hook | high jumping | left handed writer | blue cap | tiny spiders |
| Wyatt | brass compass | snake charming | left handed writer | blue cap | sticky sap |
| Steve | grapple hook | lock picking | right handed writer | blue cap | sticky sap |
| Skye | grapple hook | lock picking | right handed writer | blue cap | squeaky bats |
| Indiana | grapple hook | code breaking | right handed writer | blue cap | sticky sap |
| Jax | sound blaster | map reading | right handed writer | blue cap | squeaky bats |
| Jesse | sound blaster | lock picking | right handed writer | blue cap | squeaky bats |
| Clark | sound blaster | map reading | right handed writer | blue cap | sticky sap |
| Freya | mapping drone | snake charming | right handed writer | green cap | squeaky bats |
| Kip | mapping drone | snake charming | right handed writer | blue cap | tiny spiders |
| Marco | sound blaster | map reading | right handed writer | red cap | tiny spiders |
| Cleo | mapping drone | high jumping | right handed writer | blue cap | tiny spiders |
| Sacagawea | mapping drone | code breaking | left handed writer | blue cap | squeaky bats |
| Cora | mapping drone | high jumping | right handed writer | blue cap | squeaky bats |
| Nellie | grapple hook | snake charming | right handed writer | blue cap | squeaky bats |
Clue 1
Fractions of a number
To track the thief's escape path, we must calculate the fuel usage of our explorer jeep over several bumpy legs of the jungle 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.
T
16
54
22
19
42
38
38
53
42
4
25
39
22
49
4
39
T
16
54
53
19
22
T
16
54
22
38
39
44
13
40
42
44
13
42
4
3
49
13
42
38
38
1/10 of 160 =T
4/5 of 5 =N
4/8 of 88 =C
2/4 of 26 =K
1/4 of 76 =V
1/6 of 150 =D
2/4 of 80 =P
1/4 of 12 =G
4/6 of 57 =L
3/6 of 106 =A
4/6 of 63 =I
3/8 of 104 =O
5/10 of 108 =H
1/5 of 110 =E
1/2 of 98 =S
0/15 letters found
Clue 2
Word problems
The thief dropped a trail of heavy gear. We need to find the total weight of the discarded supplies to see how fast they are moving.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Awitnesssawthevillainwas .
R
9
29
114
116
117
116
55
108
D
E
D
W
R
9
29
117
E
R
9
Professor Flint found 6 gold coins yesterday and 3 more today. How many gold coins in all?R
Professor Flint found 83 energy crystals yesterday and 25 more today. How many energy crystals in all?N
Professor Flint found 7 rope coils yesterday and 109 more today. How many rope coils in all?H
Professor Flint found 28 gold coins yesterday and 86 more today. How many gold coins in all?G
There were 64 ancient maps. 35 were used up. How many ancient maps are left?I
Professor Flint found 8 stone idols yesterday and 109 more today. How many stone idols in all?T
Professor Flint lined up 5 rows of 11 ancient maps. How many ancient maps in all?A
0/7 letters found
Clue 3
Multi-step word problems
A friendly troop of capuchin monkeys saw the villain. They will share their clues only if we help them divide their gathered bananas evenly.
Solve each problem to learn its letter, then write the letters in the boxes to fill in the missing word.
Someonescaredthevillainoffwith .
S
51
36
71
80
24
78
56
B
24
T
S
51
Professor Flint filled 6 boxes with 2 energy crystals each, then found 39 more energy crystals. How many energy crystals are there in all?S
There were 424 stone idols in all. 34 stone idols were set aside. The rest were shared equally among 5 Junior Rangers. How many stone idols did each get?K
There were 748 ancient maps in all. 28 ancient maps were set aside. The rest were shared equally among 9 Junior Rangers. How many ancient maps did each get?E
Professor Flint earned 6 gold coins in each of 2 rounds, plus 48 bonus gold coins. Then 4 gold coins were lost. How many gold coins are left?Y
Professor Flint earned 6 energy crystals in each of 6 rounds, plus 1 bonus energy crystals. Then 13 energy crystals were lost. How many energy crystals are left?A
Professor Flint earned 2 stone idols in each of 4 rounds, plus 73 bonus stone idols. Then 10 stone idols were lost. How many stone idols are left?U
There were 92 rope coils in all. 20 rope coils were set aside. The rest were shared equally among 2 Junior Rangers. How many rope coils did each get?Q
0/7 letters found
Clue 4
Multiplication facts (1-12)
The ancient temple floor is covered in a grid of traps. We must multiply the rows of pressure plates to find a safe path across.
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
16
8
50
99
50
T
16
50
15
T
16
12
108
50
110
84
48
81
99
5
33
70
48
50
T
16
8
121
50
5
99
8 × 2 =T
12 × 4 =U
3 × 5 =C
11 × 9 =D
12 × 9 =V
2 × 6 =I
11 × 11 =R
1 × 5 =A
2 × 4 =H
10 × 7 =L
11 × 10 =F
12 × 7 =O
9 × 9 =N
5 × 10 =E
11 × 3 =B
0/15 letters found
Clue 5
Fractions of a number — the last clue
We found a locked stone door with crystal slots. To unlock it, we must calculate exactly what fraction of our energy crystals are fully charged.
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
3/6 of 6 = ?
2/5 of 25 = ?
1/4 of 20 = ?
3/6 of 18 = ?
2/3 of 18 = ?
5/10 of 22 = ?
2/4 of 8 = ?
1/4 of 4 = ?
7/10 of 10 = ?
1/10 of 80 = ?
3/10 of 20 = ?
Step 2 — cross out the sentence with each answer
1.The villain blasted the stone rubble with a sound blaster, then opened the treasure chest using lock picking.
2.The villain swung across the canyon with a grapple hook, then calmed the pit of vipers using snake charming.
3.The villain blasted the stone rubble with a sound blaster, then found the hidden path using map reading.
4.The villain navigated the dark tunnels with a brass compass, then opened the treasure chest using lock picking.
5.The villain scouted the temple roof with a mapping drone, then leaped over the pit using high jumping.
6.The villain swung across the canyon with a grapple hook, then solved the ancient puzzle using code breaking.
7.The villain navigated the dark tunnels with a brass compass, then solved the ancient puzzle using code breaking.
8.The villain scouted the temple roof with a mapping drone, then opened the treasure chest using lock picking.
9.The villain blasted the stone rubble with a sound blaster, then solved the ancient puzzle using code breaking.
10.The villain scouted the temple roof with a mapping drone, then solved the ancient puzzle using code breaking.
11.The villain navigated the dark tunnels with a brass compass, then leaped over the pit using high jumping.
12.The villain melted the iron gates with a laser torch, then opened the treasure chest using lock picking.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Mystery of the Golden Mask
Culprit: Nellie (grapple hook · snake charming · right handed writer · blue cap · squeaky bats)
- Clue 1 (Fractions of a number): "THE VILLAIN DOES NOT HAVE THE LOCK PICKING SKILL"1/10 of 160 = 16 (T) · 4/5 of 5 = 4 (N) · 4/8 of 88 = 44 (C) · 2/4 of 26 = 13 (K) · 1/4 of 76 = 19 (V) · 1/6 of 150 = 25 (D) · 2/4 of 80 = 40 (P) · 1/4 of 12 = 3 (G) · 4/6 of 57 = 38 (L) · 3/6 of 106 = 53 (A) · 4/6 of 63 = 42 (I) · 3/8 of 104 = 39 (O) · 5/10 of 108 = 54 (H) · 1/5 of 110 = 22 (E) · 1/2 of 98 = 49 (S)
- Clue 2 (Word problems): "RIGHT HANDED WRITER"Professor Flint found 6 gold coins yesterday and 3 more today. How many gold coins in all? = 9 (R) · Professor Flint found 83 energy crystals yesterday and 25 more today. How many energy crystals in all? = 108 (N) · Professor Flint found 7 rope coils yesterday and 109 more today. How many rope coils in all? = 116 (H) · Professor Flint found 28 gold coins yesterday and 86 more today. How many gold coins in all? = 114 (G) · There were 64 ancient maps. 35 were used up. How many ancient maps are left? = 29 (I) · Professor Flint found 8 stone idols yesterday and 109 more today. How many stone idols in all? = 117 (T) · Professor Flint lined up 5 rows of 11 ancient maps. How many ancient maps in all? = 55 (A)
- Clue 3 (Multi-step word problems): "SQUEAKY BATS"Professor Flint filled 6 boxes with 2 energy crystals each, then found 39 more energy crystals. How many energy crystals are there in all? = 51 (S) · There were 424 stone idols in all. 34 stone idols were set aside. The rest were shared equally among 5 Junior Rangers. How many stone idols did each get? = 78 (K) · There were 748 ancient maps in all. 28 ancient maps were set aside. The rest were shared equally among 9 Junior Rangers. How many ancient maps did each get? = 80 (E) · Professor Flint earned 6 gold coins in each of 2 rounds, plus 48 bonus gold coins. Then 4 gold coins were lost. How many gold coins are left? = 56 (Y) · Professor Flint earned 6 energy crystals in each of 6 rounds, plus 1 bonus energy crystals. Then 13 energy crystals were lost. How many energy crystals are left? = 24 (A) · Professor Flint earned 2 stone idols in each of 4 rounds, plus 73 bonus stone idols. Then 10 stone idols were lost. How many stone idols are left? = 71 (U) · There were 92 rope coils in all. 20 rope coils were set aside. The rest were shared equally among 2 Junior Rangers. How many rope coils did each get? = 36 (Q)
- Clue 4 (Multiplication facts (1-12)): "THE DETECTIVE FOUND A BLUE THREAD"8 × 2 = 16 (T) · 12 × 4 = 48 (U) · 3 × 5 = 15 (C) · 11 × 9 = 99 (D) · 12 × 9 = 108 (V) · 2 × 6 = 12 (I) · 11 × 11 = 121 (R) · 1 × 5 = 5 (A) · 2 × 4 = 8 (H) · 10 × 7 = 70 (L) · 11 × 10 = 110 (F) · 12 × 7 = 84 (O) · 9 × 9 = 81 (N) · 5 × 10 = 50 (E) · 11 × 3 = 33 (B)
- Clue 5 (Fractions of a number): surviving statement (box 2) → Nellie3/6 of 6 = 3 · 2/5 of 25 = 10 · 1/4 of 20 = 5 · 3/6 of 18 = 9 · 2/3 of 18 = 12 · 5/10 of 22 = 11 · 2/4 of 8 = 4 · 1/4 of 4 = 1 · 7/10 of 10 = 7 · 1/10 of 80 = 8 · 3/10 of 20 = 6
About this mystery
- Grade level
- Grade 7 math
- Math topics
- Fractions of a number, Word problems, Multi-step word problems, Multiplication
- Reading level
- grades 5-6
- Theme
- The Mystery of the Golden Mask — set in The Whispering Jungle Ruins
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects