🔎 Stranger thingsGrade 5Reading: grades 3-4MultiplicationFractions of a numberOrder of operationsRoundingMissing addends
The Shadow Mystery of Oakhaven
A strange creature called the Mind Shadow has invaded the town of Oakhaven! Use your math skills and clues to uncover who is secretly controlling it before the portal opens completely.
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 | Psionic Power | Survival Gear | Dominant Hand | Hair Style | Secret Weakness |
|---|---|---|---|---|---|
| Murray | Shadow Walk | Walkie Talkie | Right Handed | Wavy Blonde | Loud Music |
| Robin | Sonic Scream | Walkie Talkie | Right Handed | Wavy Blonde | Loud Music |
| Maxie | Static Beam | Roller Skates | Left Handed | Wavy Blonde | Cold Ice |
| Argyle | Static Beam | Flashlight | Right Handed | Wavy Blonde | Loud Music |
| Eddie | Sonic Scream | Roller Skates | Left Handed | Wavy Blonde | Loud Music |
| Mike | Telekinesis | Compass | Right Handed | Curly Brown | Bright Lights |
| Holly | Shadow Walk | Slingshot | Right Handed | Wavy Blonde | Loud Music |
| Chrissy | Sonic Scream | Flashlight | Left Handed | Spiky Black | Loud Music |
| Steve | Static Beam | Compass | Right Handed | Curly Brown | Loud Music |
| Bob | Static Beam | Walkie Talkie | Right Handed | Curly Brown | Loud Music |
| Will | Mind Blast | Walkie Talkie | Right Handed | Wavy Blonde | Cold Ice |
| Dustin | Mind Blast | Compass | Right Handed | Wavy Blonde | Loud Music |
| Erica | Telekinesis | Slingshot | Left Handed | Wavy Blonde | Loud Music |
| Jonathan | Shadow Walk | Flashlight | Left Handed | Wavy Blonde | Cold Ice |
| Vickie | Mind Blast | Flashlight | Left Handed | Wavy Blonde | Bright Lights |
| Owens | Mind Blast | Compass | Right Handed | Wavy Blonde | Bright Lights |
| Barb | Shadow Walk | Walkie Talkie | Right Handed | Wavy Blonde | Cold Ice |
| Joyce | Mind Blast | Roller Skates | Left Handed | Wavy Blonde | Bright Lights |
| Eleven | Shadow Walk | Flashlight | Left Handed | Wavy Blonde | Loud Music |
| Karen | Shadow Walk | Walkie Talkie | Left Handed | Wavy Blonde | Bright Lights |
| Nancy | Telekinesis | Slingshot | Right Handed | Wavy Blonde | Bright Lights |
Clue 1
Multiplication facts (1-12)
The kids counted rows of glowing waffles hidden inside the arcade supply box.
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
84
15
20
55
108
18
18
81
108
50
63
35
20
80
50
35
T
84
12
80
20
81
77
35
64
8
81
80
80
7 × 12 =T
3 × 6 =L
9 × 9 =A
8 × 10 =S
5 × 7 =O
10 × 5 =N
9 × 12 =I
3 × 4 =U
7 × 9 =D
11 × 7 =C
8 × 1 =P
2 × 10 =E
8 × 8 =M
5 × 11 =V
5 × 3 =H
0/15 letters found
Clue 2
Fractions of a number
The club calculated what fraction of the town walkie talkies were still picking up signals.
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
26
19
14
2
8
2
28
14
16
T
26
8
2
14
35
T
26
19
14
23
39
39
23
7
19
T
26
19
22
17
35
2/5 of 65 =T
1/3 of 66 =A
6/10 of 65 =R
2/10 of 10 =S
1/2 of 28 =E
2/6 of 51 =N
1/3 of 57 =H
2/3 of 42 =P
2/6 of 105 =D
7/8 of 8 =G
1/5 of 115 =I
1/3 of 24 =U
4/6 of 24 =C
0/13 letters found
Clue 3
Order of operations
To unlock the lab computer the team followed the multistep security code on the monitor.
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
58
50
31
15
29
20
20
10
29
13
7
10
14
14
T
58
32
37
37
31
51
23
61
20
32
48
51
12
48
14
29
30
12 × 6 - 14 =T
7 × 11 - 16 =Y
10 + 2 × 2 =S
3 × 9 - 4 =B
5 × 6 - 15 =V
10 × 4 - 11 =I
1 + 3 × 4 =N
9 × 6 - 22 =O
45 + 3 × 2 =D
9 × 3 - 15 =M
7 + 3 × 8 =E
3 × 11 - 26 =W
36 + 7 × 2 =H
2 + 2 × 9 =L
6 × 10 - 30 =C
11 × 5 - 7 =U
19 + 9 × 2 =P
4 × 7 - 18 =A
0/18 letters found
Clue 4
Rounding
The digital signal reader at the radio tower only showed rounded energy levels.
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
70
3000
2900
430
200
700
170
9000
1700
370
2300
3000
5000
300
W
70
3000
2000
2000
130
50
500
4300
170
9000
130
2300
370
1700
170
170
300
Round 68 to the nearest tenW
Round 245 to the nearest hundredB
Round 172 to the nearest tenO
Round 680 to the nearest hundredL
Round 2,931 to the nearest hundredV
Round 50 to the nearest tenU
Round 8,599 to the nearest thousandN
Round 2,335 to the nearest hundredH
Round 302 to the nearest hundredR
Round 1,718 to the nearest hundredD
Round 4,272 to the nearest hundredK
Round 433 to the nearest tenY
Round 3,245 to the nearest thousandA
Round 4,769 to the nearest thousandI
Round 2,140 to the nearest thousandS
Round 130 to the nearest tenT
Round 368 to the nearest tenE
Round 502 to the nearest hundredC
0/18 letters found
Clue 5
Missing addends — the last clue
The detective checked the total battery count to see how many packs were missing from the shed.
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
1 + ___ = 12
19 + ___ = 21
6 + ___ = 15
14 + ___ = 19
22 + ___ = 34
25 + ___ = 35
37 + ___ = 45
10 + ___ = 16
14 + ___ = 18
25 + ___ = 26
23 + ___ = 30
Step 2 — cross out the sentence with each answer
1.The villain blasted a shockwave, then fired a pebble with a slingshot.
2.The villain stepped into the shadows, then fired a pebble with a slingshot.
3.The villain zapped the power grid, then flashed a beam with a flashlight.
4.The villain let out a loud roar, then fired a pebble with a slingshot.
5.The villain blasted a shockwave, then called for backup on a walkie talkie.
6.The villain threw a vending machine, then called for backup on a walkie talkie.
7.The villain zapped the power grid, then called for backup on a walkie talkie.
8.The villain zapped the power grid, then zoomed away on fast roller skates.
9.The villain stepped into the shadows, then called for backup on a walkie talkie.
10.The villain threw a vending machine, then fired a pebble with a slingshot.
11.The villain let out a loud roar, then called for backup on a walkie talkie.
12.The villain blasted a shockwave, then checked the spinning needle on a compass.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Shadow Mystery of Oakhaven
Culprit: Argyle (Static Beam · Flashlight · Right Handed · Wavy Blonde · Loud Music)
- Clue 1 (Multiplication facts (1-12)): "THE VILLAIN DOES NOT USE A COMPASS"7 × 12 = 84 (T) · 3 × 6 = 18 (L) · 9 × 9 = 81 (A) · 8 × 10 = 80 (S) · 5 × 7 = 35 (O) · 10 × 5 = 50 (N) · 9 × 12 = 108 (I) · 3 × 4 = 12 (U) · 7 × 9 = 63 (D) · 11 × 7 = 77 (C) · 8 × 1 = 8 (P) · 2 × 10 = 20 (E) · 8 × 8 = 64 (M) · 5 × 11 = 55 (V) · 5 × 3 = 15 (H)
- Clue 2 (Fractions of a number): "THE SUSPECT USED THEIR RIGHT HAND"2/5 of 65 = 26 (T) · 1/3 of 66 = 22 (A) · 6/10 of 65 = 39 (R) · 2/10 of 10 = 2 (S) · 1/2 of 28 = 14 (E) · 2/6 of 51 = 17 (N) · 1/3 of 57 = 19 (H) · 2/3 of 42 = 28 (P) · 2/6 of 105 = 35 (D) · 7/8 of 8 = 7 (G) · 1/5 of 115 = 23 (I) · 1/3 of 24 = 8 (U) · 4/6 of 24 = 16 (C)
- Clue 3 (Order of operations): "THE VILLAIN WAS STOPPED BY LOUD MUSIC"12 × 6 - 14 = 58 (T) · 7 × 11 - 16 = 61 (Y) · 10 + 2 × 2 = 14 (S) · 3 × 9 - 4 = 23 (B) · 5 × 6 - 15 = 15 (V) · 10 × 4 - 11 = 29 (I) · 1 + 3 × 4 = 13 (N) · 9 × 6 - 22 = 32 (O) · 45 + 3 × 2 = 51 (D) · 9 × 3 - 15 = 12 (M) · 7 + 3 × 8 = 31 (E) · 3 × 11 - 26 = 7 (W) · 36 + 7 × 2 = 50 (H) · 2 + 2 × 9 = 20 (L) · 6 × 10 - 30 = 30 (C) · 11 × 5 - 7 = 48 (U) · 19 + 9 × 2 = 37 (P) · 4 × 7 - 18 = 10 (A)
- Clue 4 (Rounding): "WAVY BLONDE HAIR WAS STUCK ON THE DOOR"Round 68 to the nearest ten = 70 (W) · Round 245 to the nearest hundred = 200 (B) · Round 172 to the nearest ten = 170 (O) · Round 680 to the nearest hundred = 700 (L) · Round 2,931 to the nearest hundred = 2900 (V) · Round 50 to the nearest ten = 50 (U) · Round 8,599 to the nearest thousand = 9000 (N) · Round 2,335 to the nearest hundred = 2300 (H) · Round 302 to the nearest hundred = 300 (R) · Round 1,718 to the nearest hundred = 1700 (D) · Round 4,272 to the nearest hundred = 4300 (K) · Round 433 to the nearest ten = 430 (Y) · Round 3,245 to the nearest thousand = 3000 (A) · Round 4,769 to the nearest thousand = 5000 (I) · Round 2,140 to the nearest thousand = 2000 (S) · Round 130 to the nearest ten = 130 (T) · Round 368 to the nearest ten = 370 (E) · Round 502 to the nearest hundred = 500 (C)
- Clue 5 (Missing addends): surviving statement (box 3) → Argyle1 + ___ = 12 = 11 · 19 + ___ = 21 = 2 · 6 + ___ = 15 = 9 · 14 + ___ = 19 = 5 · 22 + ___ = 34 = 12 · 25 + ___ = 35 = 10 · 37 + ___ = 45 = 8 · 10 + ___ = 16 = 6 · 14 + ___ = 18 = 4 · 25 + ___ = 26 = 1 · 23 + ___ = 30 = 7
About this mystery
- Grade level
- Grade 5 math
- Math topics
- Multiplication, Fractions of a number, Order of operations, Rounding, Missing addends
- Reading level
- grades 3-4
- Theme
- The Shadow Mystery of Oakhaven — set in Oakhaven Middle School
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects