Grade 4Reading: grades 5-6RoundingAdditionSubtractionMultiplicationDivision
The Case of the Missing Holo-Key
Someone has bypassed the security lasers and swiped the golden Holo-Key from the Spy High Vault. The Chief of Gadgets is locked in the training room! We must decode the files to find the rogue agent before they escape on the spy jet.
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 | Primary Gadget | Specialty Skill | Dominant Hand | Hair Dye Color | Gear Counter |
|---|---|---|---|---|---|
| Perry | Stealth Cloak | Wall Climbing | Right-handed | Neon Blue | Strong Magnets |
| Clover | Stealth Cloak | Wall Climbing | Right-handed | Flaming Red | Bright Flash |
| Jason | Stealth Cloak | Laser Dodging | Left-handed | Neon Blue | Bright Flash |
| Cody | Grappling Hook | Safe Cracking | Left-handed | Neon Blue | Loud Noises |
| Alex | Decoy Drone | Wall Climbing | Left-handed | Jet Black | Bright Flash |
| Chase | Grappling Hook | Code Breaking | Left-handed | Flaming Red | Loud Noises |
| Danger | Grappling Hook | Safe Cracking | Right-handed | Jet Black | Bright Flash |
| Skye | Grappling Hook | Code Breaking | Left-handed | Flaming Red | Bright Flash |
| Ryder | Decoy Drone | Laser Dodging | Left-handed | Neon Blue | Strong Magnets |
| Penny | Decoy Drone | Wall Climbing | Left-handed | Flaming Red | Bright Flash |
| Natasha | Stealth Cloak | Code Breaking | Left-handed | Flaming Red | Loud Noises |
| Sam | Rocket Boots | Wall Climbing | Left-handed | Flaming Red | Bright Flash |
| Kim | Laser Watch | Laser Dodging | Left-handed | Flaming Red | Bright Flash |
| Johnny | Laser Watch | Wall Climbing | Right-handed | Jet Black | Loud Noises |
| Gadget | Decoy Drone | Wall Climbing | Left-handed | Neon Blue | Loud Noises |
| James | Grappling Hook | Laser Dodging | Right-handed | Jet Black | Loud Noises |
| Carmen | Rocket Boots | Laser Dodging | Right-handed | Jet Black | Strong Magnets |
| Ethan | Stealth Cloak | Safe Cracking | Right-handed | Flaming Red | Loud Noises |
| Austin | Grappling Hook | Wall Climbing | Left-handed | Flaming Red | Bright Flash |
| Fox | Stealth Cloak | Code Breaking | Left-handed | Neon Blue | Loud Noises |
| Clouseau | Decoy Drone | Safe Cracking | Left-handed | Neon Blue | Bright Flash |
Clue 1
Rounding
The digital security terminal shows the approximate power usage of the rogue's gadget. We need to round these numbers to the nearest ten to unlock the main system logs.
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
2000
4300
2900
70
1700
430
430
50
1700
90
5000
3000
2900
170
90
3000
T
2000
300
170
2900
430
50
170
2900
700
5000
3000
5000
110
1700
90
110
Round 2,110 to the nearest thousandT
Round 87 to the nearest tenN
Round 2,709 to the nearest thousandO
Round 1,700 to the nearest hundredI
Round 167 to the nearest tenS
Round 4,323 to the nearest hundredH
Round 73 to the nearest tenV
Round 108 to the nearest tenG
Round 297 to the nearest hundredU
Round 434 to the nearest tenL
Round 709 to the nearest hundredR
Round 5,359 to the nearest thousandD
Round 2,855 to the nearest hundredE
Round 47 to the nearest tenA
0/14 letters found
Clue 2
Addition
We found several scattered pages of the rogue's escape plan. Let's add up the code numbers on each page to find the total security override passcode.
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
3973
5752
2865
3271
8678
3271
5181
2865
4174
T
3973
7293
3850
4067
T
3973
2865
7841
4067
T
3973
2865
3271
7293
2026
T
3973
5752
T
3973
5752
2865
6266
2865
8141
T
3973
5752
3968
7841
8081
1732 + 2241 =T
2300 + 3966 =L
2132 + 3049 =P
1935 + 2132 =O
1365 + 1906 =S
3879 + 1873 =H
3280 + 4013 =W
4781 + 3060 =N
5878 + 2800 =U
2595 + 1255 =R
1054 + 972 =I
869 + 1996 =E
4846 + 3235 =D
4061 + 4080 =F
1447 + 2727 =C
1625 + 2343 =A
0/16 letters found
Clue 3
Subtraction
The spy academy vault scale shows some weight is missing. By subtracting the current vault weight from yesterday's record, we can find out how much fuel the rogue stole.
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
5756
8031
8884
6603
5564
7922
7433
8884
7699
6701
6882
7059
3784
1243
7271
1121
8884
1121
7059
8502
6701
7059
6603
1243
7922
8031
T
5756
4544
3784
6701
6882
8031
6094 - 338 =T
7955 - 2391 =O
10615 - 3344 =N
12255 - 3371 =E
11620 - 3589 =H
8628 - 4084 =F
5250 - 4007 =I
8463 - 4679 =L
2458 - 1337 =D
10479 - 3778 =A
6978 - 96 =S
11986 - 4064 =G
12842 - 4340 =Y
9327 - 1628 =W
9384 - 1951 =U
8534 - 1475 =B
9654 - 3051 =R
0/17 letters found
Clue 4
Multiplication facts (1-12)
To crack the secondary encryption, we must look at the rows of security lasers in the grid. Multiply the rows by the columns to figure out the active security bypass 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
11
54
50
60
96
50
88
T
11
72
50
144
T
11
144
72
60
36
9
88
96
21
50
108
54
60
9
21
60
T
11
T
11
54
50
42
44
50
88
50
1 × 11 =T
12 × 12 =F
8 × 12 =G
9 × 1 =I
10 × 5 =E
11 × 8 =N
12 × 9 =D
7 × 6 =S
12 × 5 =A
6 × 9 =H
8 × 9 =L
12 × 3 =M
7 × 3 =R
11 × 4 =C
0/14 letters found
Clue 5
Division facts (1-12) — the last clue
We need to split the remaining tracking devices equally among our active field agents. Use division to determine how many trackers each agent gets.
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
45 ÷ 9 = ?
8 ÷ 4 = ?
48 ÷ 12 = ?
1 ÷ 1 = ?
120 ÷ 12 = ?
18 ÷ 2 = ?
15 ÷ 5 = ?
60 ÷ 10 = ?
96 ÷ 12 = ?
36 ÷ 3 = ?
84 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain disables the alarms with a laser watch, then escapes over the barbed wire by wall climbing.
2.The villain scales the vault wall with a grappling hook, then escapes over the barbed wire by wall climbing.
3.The villain disables the alarms with a laser watch, then bypasses the digital vault door by code breaking.
4.The villain scales the vault wall with a grappling hook, then bypasses the digital vault door by code breaking.
5.The villain distracts the security team with a decoy drone, then escapes over the barbed wire by wall climbing.
6.The villain slips past the guards using a stealth cloak, then opens the titanium strongbox by safe cracking.
7.The villain blasts through the skylight with rocket boots, then opens the back emergency exit by lock picking.
8.The villain disables the alarms with a laser watch, then opens the back emergency exit by lock picking.
9.The villain scales the vault wall with a grappling hook, then opens the back emergency exit by lock picking.
10.The villain disables the alarms with a laser watch, then opens the titanium strongbox by safe cracking.
11.The villain blasts through the skylight with rocket boots, then escapes over the barbed wire by wall climbing.
12.The villain blasts through the skylight with rocket boots, then opens the titanium strongbox by safe cracking.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Holo-Key
Culprit: Sam (Rocket Boots · Wall Climbing · Left-handed · Flaming Red · Bright Flash)
- Clue 1 (Rounding): "THE VILLAIN DOES NOT USE LASER DODGING"Round 2,110 to the nearest thousand = 2000 (T) · Round 87 to the nearest ten = 90 (N) · Round 2,709 to the nearest thousand = 3000 (O) · Round 1,700 to the nearest hundred = 1700 (I) · Round 167 to the nearest ten = 170 (S) · Round 4,323 to the nearest hundred = 4300 (H) · Round 73 to the nearest ten = 70 (V) · Round 108 to the nearest ten = 110 (G) · Round 297 to the nearest hundred = 300 (U) · Round 434 to the nearest ten = 430 (L) · Round 709 to the nearest hundred = 700 (R) · Round 5,359 to the nearest thousand = 5000 (D) · Round 2,855 to the nearest hundred = 2900 (E) · Round 47 to the nearest ten = 50 (A)
- Clue 2 (Addition): "THE SUSPECT WROTE NOTES WITH THE LEFT HAND"1732 + 2241 = 3973 (T) · 2300 + 3966 = 6266 (L) · 2132 + 3049 = 5181 (P) · 1935 + 2132 = 4067 (O) · 1365 + 1906 = 3271 (S) · 3879 + 1873 = 5752 (H) · 3280 + 4013 = 7293 (W) · 4781 + 3060 = 7841 (N) · 5878 + 2800 = 8678 (U) · 2595 + 1255 = 3850 (R) · 1054 + 972 = 2026 (I) · 869 + 1996 = 2865 (E) · 4846 + 3235 = 8081 (D) · 4061 + 4080 = 8141 (F) · 1447 + 2727 = 4174 (C) · 1625 + 2343 = 3968 (A)
- Clue 3 (Subtraction): "THE ROGUE WAS BLINDED BY A BRIGHT FLASH"6094 - 338 = 5756 (T) · 7955 - 2391 = 5564 (O) · 10615 - 3344 = 7271 (N) · 12255 - 3371 = 8884 (E) · 11620 - 3589 = 8031 (H) · 8628 - 4084 = 4544 (F) · 5250 - 4007 = 1243 (I) · 8463 - 4679 = 3784 (L) · 2458 - 1337 = 1121 (D) · 10479 - 3778 = 6701 (A) · 6978 - 96 = 6882 (S) · 11986 - 4064 = 7922 (G) · 12842 - 4340 = 8502 (Y) · 9327 - 1628 = 7699 (W) · 9384 - 1951 = 7433 (U) · 8534 - 1475 = 7059 (B) · 9654 - 3051 = 6603 (R)
- Clue 4 (Multiplication facts (1-12)): "THE AGENT LEFT FLAMING RED HAIR AT THE SCENE"1 × 11 = 11 (T) · 12 × 12 = 144 (F) · 8 × 12 = 96 (G) · 9 × 1 = 9 (I) · 10 × 5 = 50 (E) · 11 × 8 = 88 (N) · 12 × 9 = 108 (D) · 7 × 6 = 42 (S) · 12 × 5 = 60 (A) · 6 × 9 = 54 (H) · 8 × 9 = 72 (L) · 12 × 3 = 36 (M) · 7 × 3 = 21 (R) · 11 × 4 = 44 (C)
- Clue 5 (Division facts (1-12)): surviving statement (box 11) → Sam45 ÷ 9 = 5 · 8 ÷ 4 = 2 · 48 ÷ 12 = 4 · 1 ÷ 1 = 1 · 120 ÷ 12 = 10 · 18 ÷ 2 = 9 · 15 ÷ 5 = 3 · 60 ÷ 10 = 6 · 96 ÷ 12 = 8 · 36 ÷ 3 = 12 · 84 ÷ 12 = 7
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 5-6
- Theme
- The Case of the Missing Holo-Key — set in The Vault at Spy High Academy
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects