🔎 TechGrade 3Reading: grades 3-4RoundingAdditionSubtractionMultiplicationDivision
The Great Server Room Glitch
A sneaky intruder called the Glitch has bypassed our firewalls! The Lead Inventor's brand new AI engine is missing. We must use our coding clues to find who did it before the system crashes!
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 | Coding Skill | Favorite Gadget | Typing Style | Avatar Hat | System Vulnerability |
|---|---|---|---|---|---|
| Larry Page | html coding | holo projector | left handed typer | cyber helmet | dust bunnies |
| Satya Nadella | html coding | pocket drone | left handed typer | cyber helmet | dust bunnies |
| Bill Gates | html coding | sonar headset | right handed typer | neon visor | dust bunnies |
| Sundar Pichai | html coding | data glove | left handed typer | cyber helmet | dust bunnies |
| Katherine Johnson | python | sonar headset | left handed typer | cyber helmet | dust bunnies |
| Ada Lovelace | c plus plus | holo projector | left handed typer | cyber helmet | magnets |
| Sergey Brin | python | pocket drone | left handed typer | cyber helmet | dust bunnies |
| Alan Turing | html coding | holo projector | left handed typer | cyber helmet | magnets |
| Guido van Rossum | javascript | holo projector | right handed typer | cyber helmet | dust bunnies |
| Jeff Bezos | html coding | pocket drone | left handed typer | beanbag beanie | magnets |
| Linus Torvalds | html coding | laser stylus | right handed typer | beanbag beanie | water splashes |
| Elon Musk | html coding | data glove | left handed typer | beanbag beanie | dust bunnies |
| Hedy Lamarr | javascript | data glove | left handed typer | beanbag beanie | water splashes |
| Susan Wojcicki | javascript | sonar headset | left handed typer | beanbag beanie | dust bunnies |
| Tim Berners Lee | javascript | data glove | right handed typer | beanbag beanie | magnets |
| Tim Cook | html coding | sonar headset | left handed typer | neon visor | dust bunnies |
| Margaret Hamilton | c plus plus | holo projector | left handed typer | neon visor | magnets |
| Steve Wozniak | html coding | pocket drone | left handed typer | neon visor | dust bunnies |
| Radia Perlman | binary code | data glove | left handed typer | neon visor | magnets |
| Grace Hopper | c plus plus | sonar headset | left handed typer | neon visor | magnets |
| Steve Jobs | binary code | holo projector | left handed typer | neon visor | dust bunnies |
Clue 1
Rounding
The lab radar scans the network. It only shows rounded numbers for the data packets. Let's round the numbers to read the secret message.
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
40
800
20
4000
30
3000
T
40
50
800
7000
400
20
200
70
400
T
40
700
200
20
60
200
400
70
60
500
800
20
60
7000
200
20
T
40
Round 41 to the nearest tenT
Round 6,745 to the nearest thousandD
Round 3,146 to the nearest thousandI
Round 447 to the nearest hundredO
Round 69 to the nearest tenN
Round 24 to the nearest tenE
Round 734 to the nearest hundredU
Round 4,159 to the nearest thousandG
Round 29 to the nearest tenL
Round 151 to the nearest hundredS
Round 64 to the nearest tenA
Round 51 to the nearest tenC
Round 827 to the nearest hundredH
Round 499 to the nearest hundredR
0/14 letters found
Clue 2
Addition
We need to find the total power used by the server racks. Add the electricity units from each room to open the locked door.
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
408
543
226
263
910
394
T
408
721
543
394
902
249
910
226
977
T
408
543
249
805
549
226
549
T
408
476
419
226
621
272 + 136 =T
127 + 136 =G
448 + 454 =S
154 + 265 =P
511 + 466 =F
327 + 583 =L
107 + 142 =A
411 + 394 =N
261 + 360 =R
225 + 324 =D
197 + 197 =I
156 + 70 =E
190 + 286 =Y
311 + 232 =H
407 + 314 =C
0/15 letters found
Clue 3
Subtraction
The main storage vault was drained of its backup batteries. Subtract the remaining cells from the starting amount to find the difference.
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
709
506
768
834
658
834
T
709
768
636
251
834
319
768
837
468
T
709
633
512
522
834
T
709
288
522
224
224
251
768
834
805 - 96 =T
862 - 356 =H
690 - 168 =U
410 - 91 =W
857 - 221 =M
706 - 48 =Y
1183 - 346 =A
501 - 33 =K
410 - 186 =N
387 - 136 =I
1032 - 399 =O
821 - 53 =E
615 - 327 =B
986 - 152 =S
826 - 314 =D
0/15 letters found
Clue 4
Multiplication facts (1-12)
The server room has rows of glowing hard drives. Multiply the rows by the drives in each row to find the system 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
120
64
10
50
4
50
T
120
50
66
9
10
50
66
144
50
42
36
3
10
66
64
10
20
30
10
T
120
10 × 12 =T
12 × 12 =S
5 × 2 =E
2 × 2 =V
3 × 3 =W
10 × 3 =M
11 × 6 =R
4 × 5 =L
3 × 1 =B
7 × 6 =C
5 × 10 =A
8 × 8 =H
6 × 6 =Y
0/13 letters found
Clue 5
Division facts (1-12) — the last clue
We have a pile of replacement microchips to share. Divide them equally among the robot helpers to reboot the system.
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
60 ÷ 5 = ?
40 ÷ 8 = ?
30 ÷ 3 = ?
42 ÷ 6 = ?
40 ÷ 5 = ?
6 ÷ 6 = ?
18 ÷ 9 = ?
40 ÷ 10 = ?
99 ÷ 9 = ?
66 ÷ 11 = ?
21 ÷ 7 = ?
Step 2 — cross out the sentence with each answer
1.The villain overrides the security locks, then pockets the power core.
2.The villain overrides the security locks, then snatches the prototype drive.
3.The villain hacks the main server, then snatches the prototype drive.
4.The villain hacks the main server, then steals the golden wrench.
5.The villain deletes the cloud backup, then steals the golden wrench.
6.The villain scrambles the database, then snatches the prototype drive.
7.The villain reprograms the cleaning bots, then swipes the microchip.
8.The villain overrides the security locks, then swipes the microchip.
9.The villain deletes the cloud backup, then snatches the prototype drive.
10.The villain overrides the security locks, then grabs the source code.
11.The villain reprograms the cleaning bots, then grabs the source code.
12.The villain deletes the cloud backup, then grabs the source code.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Great Server Room Glitch
Culprit: Larry Page (html coding · holo projector · left handed typer · cyber helmet · dust bunnies)
- Clue 1 (Rounding): "THE GLITCH DOES NOT USE A SONAR HEADSET"Round 41 to the nearest ten = 40 (T) · Round 6,745 to the nearest thousand = 7000 (D) · Round 3,146 to the nearest thousand = 3000 (I) · Round 447 to the nearest hundred = 400 (O) · Round 69 to the nearest ten = 70 (N) · Round 24 to the nearest ten = 20 (E) · Round 734 to the nearest hundred = 700 (U) · Round 4,159 to the nearest thousand = 4000 (G) · Round 29 to the nearest ten = 30 (L) · Round 151 to the nearest hundred = 200 (S) · Round 64 to the nearest ten = 60 (A) · Round 51 to the nearest ten = 50 (C) · Round 827 to the nearest hundred = 800 (H) · Round 499 to the nearest hundred = 500 (R)
- Clue 2 (Addition): "THE GLITCH IS A LEFT HANDED TYPER"272 + 136 = 408 (T) · 127 + 136 = 263 (G) · 448 + 454 = 902 (S) · 154 + 265 = 419 (P) · 511 + 466 = 977 (F) · 327 + 583 = 910 (L) · 107 + 142 = 249 (A) · 411 + 394 = 805 (N) · 261 + 360 = 621 (R) · 225 + 324 = 549 (D) · 197 + 197 = 394 (I) · 156 + 70 = 226 (E) · 190 + 286 = 476 (Y) · 311 + 232 = 543 (H) · 407 + 314 = 721 (C)
- Clue 3 (Subtraction): "THE SYSTEM IS WEAK TO DUST BUNNIES"805 - 96 = 709 (T) · 862 - 356 = 506 (H) · 690 - 168 = 522 (U) · 410 - 91 = 319 (W) · 857 - 221 = 636 (M) · 706 - 48 = 658 (Y) · 1183 - 346 = 837 (A) · 501 - 33 = 468 (K) · 410 - 186 = 224 (N) · 387 - 136 = 251 (I) · 1032 - 399 = 633 (O) · 821 - 53 = 768 (E) · 615 - 327 = 288 (B) · 986 - 152 = 834 (S) · 826 - 314 = 512 (D)
- Clue 4 (Multiplication facts (1-12)): "THE AVATAR WEARS A CYBER HELMET"10 × 12 = 120 (T) · 12 × 12 = 144 (S) · 5 × 2 = 10 (E) · 2 × 2 = 4 (V) · 3 × 3 = 9 (W) · 10 × 3 = 30 (M) · 11 × 6 = 66 (R) · 4 × 5 = 20 (L) · 3 × 1 = 3 (B) · 7 × 6 = 42 (C) · 5 × 10 = 50 (A) · 8 × 8 = 64 (H) · 6 × 6 = 36 (Y)
- Clue 5 (Division facts (1-12)): surviving statement (box 9) → Larry Page60 ÷ 5 = 12 · 40 ÷ 8 = 5 · 30 ÷ 3 = 10 · 42 ÷ 6 = 7 · 40 ÷ 5 = 8 · 6 ÷ 6 = 1 · 18 ÷ 9 = 2 · 40 ÷ 10 = 4 · 99 ÷ 9 = 11 · 66 ÷ 11 = 6 · 21 ÷ 7 = 3
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 3-4
- Theme
- The Great Server Room Glitch — set in The Nano-Tech Lab
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects