🔎 DetectivesGrade 3Reading: grades 3-4AdditionPlace valueSubtractionMultiplicationMissing addends
The Case of the Missing Golden Badge
Someone broke into the Master Vault at the Detective Academy and stole the Golden Badge! The Chief Inspector needs your help to examine the evidence and catch the Rogue Agent before they escape Metro City.
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 | Specialty | Gadget | Handedness | Disguise Hair | Dropped Evidence |
|---|---|---|---|---|---|
| Carmen Sandiego | Master Detective | Smoke Pellets | Right Handed | Sleek Blonde Hair | Loud Magnifying Glass |
| Detective Watson | Surveillance Tech | Smoke Pellets | Right Handed | Sleek Blonde Hair | Squeaky Trench Coat |
| Rookie Jones | Master Detective | Smoke Pellets | Left Handed | Curly Red Hair | Squeaky Trench Coat |
| Sherlock Holmes | Surveillance Tech | Decoy Badge | Right Handed | Curly Red Hair | Loud Magnifying Glass |
| Tracker Tom | Forensic Expert | Mini Drone | Left Handed | Curly Red Hair | Squeaky Trench Coat |
| Inspector Gadget | Forensic Expert | Smoke Pellets | Right Handed | Spiky Black Hair | Bright Flashlight |
| Velma Dinkley | Surveillance Tech | Grappling Hook | Left Handed | Curly Red Hair | Loud Magnifying Glass |
| Agent Smith | Master Detective | Decoy Badge | Right Handed | Curly Red Hair | Loud Magnifying Glass |
| Agent Sterling | Undercover Specialist | Grappling Hook | Right Handed | Curly Red Hair | Loud Magnifying Glass |
| Encyclopedia Brown | Master Detective | Laser Cutter | Left Handed | Curly Red Hair | Loud Magnifying Glass |
| Officer Harper | Undercover Specialist | Laser Cutter | Left Handed | Curly Red Hair | Loud Magnifying Glass |
| Nancy Drew | Codebreaker | Laser Cutter | Left Handed | Curly Red Hair | Squeaky Trench Coat |
| Dick Tracy | Codebreaker | Laser Cutter | Right Handed | Curly Red Hair | Loud Magnifying Glass |
| Officer Jenny | Codebreaker | Mini Drone | Right Handed | Sleek Blonde Hair | Loud Magnifying Glass |
| Miss Marple | Codebreaker | Smoke Pellets | Right Handed | Curly Red Hair | Loud Magnifying Glass |
| Detective Miller | Codebreaker | Mini Drone | Right Handed | Sleek Blonde Hair | Bright Flashlight |
| Chief Wiggum | Undercover Specialist | Smoke Pellets | Right Handed | Curly Red Hair | Bright Flashlight |
| Hercule Poirot | Forensic Expert | Smoke Pellets | Left Handed | Curly Red Hair | Squeaky Trench Coat |
| Sam Spade | Master Detective | Grappling Hook | Right Handed | Sleek Blonde Hair | Squeaky Trench Coat |
| Fred Jones | Surveillance Tech | Decoy Badge | Left Handed | Sleek Blonde Hair | Loud Magnifying Glass |
| Lieutenant Columbo | Codebreaker | Smoke Pellets | Left Handed | Spiky Black Hair | Loud Magnifying Glass |
Clue 1
Addition
You collect fingerprints around the vault door and add up all the clear prints found on the handle.
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
671
353
984
307
890
371
770
984
740
371
984
501
T
671
935
890
984
907
501
890
T
671
770
907
984
740
777
740
907
984
307
470
770
T
671
T
671
984
307
416 + 255 =T
212 + 141 =H
398 + 586 =E
308 + 432 =A
441 + 494 =D
107 + 200 =R
189 + 312 =N
332 + 438 =U
390 + 387 =L
162 + 308 =C
286 + 604 =O
242 + 129 =G
295 + 612 =S
0/13 letters found
Clue 2
Place value
The digital lock screen flickers, showing digits in the tens and hundreds places that reveal a clue 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.
S
900
4000
S
900
1000
70
700
6000
30
600
80
6000
70
S
900
30
80
6000
500
6000
500
70
80
600
600
80
2000
500
6000
500
20
3000
50
What is the value of the 9 in 962?S
What is the value of the 5 in 9,957?D
What is the value of the 8 in 4,380?I
What is the value of the 3 in 937?W
What is the value of the 2 in 32,885?G
What is the value of the 7 in 6,786?C
What is the value of the 1 in 1,747?P
What is the value of the 2 in 4,524?A
What is the value of the 6 in 76,982?T
What is the value of the 6 in 5,615?R
What is the value of the 4 in 4,513?U
What is the value of the 3 in 93,865?N
What is the value of the 7 in 670?E
What is the value of the 5 in 4,530?H
0/14 letters found
Clue 3
Subtraction
You count the total footprints in the hallway and subtract the stray ones left by helpful officers.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
A
874
524
234
436
887
206
A
874
376
304
691
664
207
691
304
376
376
524
A
874
247
247
887
229
234
728
728
187
887
A
874
782
247
893
187
304
187
1220 - 346 =A
372 - 138 =O
777 - 253 =L
915 - 187 =P
504 - 257 =S
703 - 267 =U
1136 - 354 =T
830 - 166 =F
491 - 115 =G
558 - 329 =R
932 - 39 =C
615 - 311 =N
327 - 120 =Y
925 - 38 =D
1011 - 320 =I
238 - 51 =E
580 - 374 =M
0/17 letters found
Clue 4
Multiplication facts (1-12)
You search the evidence locker where gear is stored in equal rows across several shelves.
Solve each problem to learn its letter. Then write that letter in every box that shows the same number, and read the secret clue.
D
70
81
45
81
64
45
33
84
81
60
7
8
63
32
D
70
64
63
88
144
77
88
81
D
70
50
121
33
88
121
45
60
64
81
32
81
10 × 7 =D
9 × 9 =E
12 × 12 =L
7 × 1 =F
8 × 8 =C
2 × 4 =O
12 × 7 =V
9 × 7 =U
11 × 7 =Y
11 × 11 =A
8 × 11 =R
4 × 8 =N
11 × 3 =I
6 × 10 =S
10 × 5 =H
9 × 5 =T
0/16 letters found
Clue 5
Missing addends — the last clue
You calculate how many secret badges are left on the rack to see how many were taken.
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
3 + ___ = 7
2 + ___ = 7
2 + ___ = 11
3 + ___ = 4
1 + ___ = 7
7 + ___ = 10
7 + ___ = 14
2 + ___ = 14
4 + ___ = 6
10 + ___ = 20
Step 2 — cross out the sentence with each answer
1.The villain swiped the golden badge, then escaped using a grappling hook.
2.The villain hacked the security grid, then cut through metal bars.
3.The villain snagged the case files, then flew away with a mini drone.
4.The villain cracked the safe lock, then dropped a decoy badge.
5.The villain erased the camera logs, then dropped a decoy badge.
6.The villain hacked the security grid, then escaped using a grappling hook.
7.The villain cracked the safe lock, then escaped using a grappling hook.
8.The villain swiped the golden badge, then vanished with smoke pellets.
9.The villain erased the camera logs, then escaped using a grappling hook.
10.The villain snagged the case files, then cut through metal bars.
11.The villain snagged the case files, then escaped using a grappling hook.
12.The villain cracked the safe lock, then vanished with smoke pellets.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Case of the Missing Golden Badge
Culprit: Miss Marple (Codebreaker · Smoke Pellets · Right Handed · Curly Red Hair · Loud Magnifying Glass)
- Clue 1 (Addition): "THE ROGUE AGENT DOES NOT USE A LASER CUTTER"416 + 255 = 671 (T) · 212 + 141 = 353 (H) · 398 + 586 = 984 (E) · 308 + 432 = 740 (A) · 441 + 494 = 935 (D) · 107 + 200 = 307 (R) · 189 + 312 = 501 (N) · 332 + 438 = 770 (U) · 390 + 387 = 777 (L) · 162 + 308 = 470 (C) · 286 + 604 = 890 (O) · 242 + 129 = 371 (G) · 295 + 612 = 907 (S)
- Clue 2 (Place value): "SUSPECT WRITES WITH THEIR RIGHT HAND"What is the value of the 9 in 962? = 900 (S) · What is the value of the 5 in 9,957? = 50 (D) · What is the value of the 8 in 4,380? = 80 (I) · What is the value of the 3 in 937? = 30 (W) · What is the value of the 2 in 32,885? = 2000 (G) · What is the value of the 7 in 6,786? = 700 (C) · What is the value of the 1 in 1,747? = 1000 (P) · What is the value of the 2 in 4,524? = 20 (A) · What is the value of the 6 in 76,982? = 6000 (T) · What is the value of the 6 in 5,615? = 600 (R) · What is the value of the 4 in 4,513? = 4000 (U) · What is the value of the 3 in 93,865? = 3000 (N) · What is the value of the 7 in 670? = 70 (E) · What is the value of the 5 in 4,530? = 500 (H)
- Clue 3 (Subtraction): "A LOUD MAGNIFYING GLASS DROPPED AT SCENE"1220 - 346 = 874 (A) · 372 - 138 = 234 (O) · 777 - 253 = 524 (L) · 915 - 187 = 728 (P) · 504 - 257 = 247 (S) · 703 - 267 = 436 (U) · 1136 - 354 = 782 (T) · 830 - 166 = 664 (F) · 491 - 115 = 376 (G) · 558 - 329 = 229 (R) · 932 - 39 = 893 (C) · 615 - 311 = 304 (N) · 327 - 120 = 207 (Y) · 925 - 38 = 887 (D) · 1011 - 320 = 691 (I) · 238 - 51 = 187 (E) · 580 - 374 = 206 (M)
- Clue 4 (Multiplication facts (1-12)): "DETECTIVES FOUND CURLY RED HAIR AT SCENE"10 × 7 = 70 (D) · 9 × 9 = 81 (E) · 12 × 12 = 144 (L) · 7 × 1 = 7 (F) · 8 × 8 = 64 (C) · 2 × 4 = 8 (O) · 12 × 7 = 84 (V) · 9 × 7 = 63 (U) · 11 × 7 = 77 (Y) · 11 × 11 = 121 (A) · 8 × 11 = 88 (R) · 4 × 8 = 32 (N) · 11 × 3 = 33 (I) · 6 × 10 = 60 (S) · 10 × 5 = 50 (H) · 9 × 5 = 45 (T)
- Clue 5 (Missing addends): surviving statement (box 8) → Miss Marple1 + ___ = 12 = 11 · 3 + ___ = 7 = 4 · 2 + ___ = 7 = 5 · 2 + ___ = 11 = 9 · 3 + ___ = 4 = 1 · 1 + ___ = 7 = 6 · 7 + ___ = 10 = 3 · 7 + ___ = 14 = 7 · 2 + ___ = 14 = 12 · 4 + ___ = 6 = 2 · 10 + ___ = 20 = 10
About this mystery
- Grade level
- Grade 3 math
- Math topics
- Addition, Place value, Subtraction, Multiplication, Missing addends
- Reading level
- grades 3-4
- Theme
- The Case of the Missing Golden Badge — set in Metro City Detective Academy Headquarters
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects