Grade 4Reading: grades 5-6RoundingAdditionSubtractionMultiplicationDivision
The Golden Decoder Caper
Someone has swiped the Golden Decoder Ring right out of the Headmaster's vault at the Whispering Pines Spy Academy! As top junior detectives, we must analyze the clues, crack the codes, and identify the rogue agent.
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 | Gadget Specialty | Secret Skill | Watch Wrist | Disguise Wig | Favorite Snack |
|---|---|---|---|---|---|
| Agent Giselle | Smoke Bomb | Hacker Access | Left Wrist Watch | Neon Blue Wig | Sour Gummies |
| Agent Owen | Laser Pen | Safe Cracking | Left Wrist Watch | Bright Orange Wig | Sour Gummies |
| Agent Leo | Decoder Watch | Lockpicking | Right Wrist Watch | Neon Blue Wig | Sour Gummies |
| Agent Hugo | Decoder Watch | Lockpicking | Right Wrist Watch | Bright Orange Wig | Maple Fudge |
| Agent Piper | Grappling Hook | Lockpicking | Left Wrist Watch | Neon Blue Wig | Maple Fudge |
| Agent Quinn | Decoder Watch | Lockpicking | Left Wrist Watch | Neon Blue Wig | Sour Gummies |
| Agent Jax | Smoke Bomb | Code Breaking | Left Wrist Watch | Neon Blue Wig | Sour Gummies |
| Agent Vance | Laser Pen | Laser Dodging | Right Wrist Watch | Jet Black Wig | Cheese Puffs |
| Agent Ryder | Laser Pen | Code Breaking | Left Wrist Watch | Bright Orange Wig | Sour Gummies |
| Agent Maya | Decoder Watch | Safe Cracking | Left Wrist Watch | Bright Orange Wig | Cheese Puffs |
| Agent Dax | Decoder Watch | Laser Dodging | Left Wrist Watch | Bright Orange Wig | Sour Gummies |
| Agent Ursula | Spy Camera | Laser Dodging | Right Wrist Watch | Bright Orange Wig | Maple Fudge |
| Agent Wyatt | Laser Pen | Lockpicking | Left Wrist Watch | Jet Black Wig | Sour Gummies |
| Agent Elena | Decoder Watch | Laser Dodging | Left Wrist Watch | Neon Blue Wig | Sour Gummies |
| Agent Ivy | Spy Camera | Hacker Access | Right Wrist Watch | Bright Orange Wig | Cheese Puffs |
| Agent Brody | Smoke Bomb | Laser Dodging | Left Wrist Watch | Neon Blue Wig | Sour Gummies |
| Agent Nova | Laser Pen | Safe Cracking | Left Wrist Watch | Jet Black Wig | Cheese Puffs |
| Agent Skye | Decoder Watch | Code Breaking | Left Wrist Watch | Bright Orange Wig | Sour Gummies |
| Agent Zara | Laser Pen | Safe Cracking | Right Wrist Watch | Bright Orange Wig | Sour Gummies |
| Agent Carmen | Decoder Watch | Hacker Access | Right Wrist Watch | Bright Orange Wig | Sour Gummies |
| Agent Archer | Grappling Hook | Laser Dodging | Right Wrist Watch | Neon Blue Wig | Cheese Puffs |
Clue 1
Rounding
The security radar system took a hit and now only displays distance numbers rounded to the nearest ten. Rounding these readings will help us trace the agent's path.
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
1100
3000
9000
700
130
1300
50
9000
430
1300
9000
110
T
1100
70
130
9000
300
110
130
T
1100
3000
430
290
9000
3000
430
370
4300
9000
700
430
370
370
9000
300
300
Round 1,145 to the nearest hundredT
Round 66 to the nearest tenD
Round 111 to the nearest tenN
Round 339 to the nearest hundredS
Round 694 to the nearest hundredR
Round 429 to the nearest tenA
Round 8,596 to the nearest thousandE
Round 132 to the nearest tenO
Round 373 to the nearest tenC
Round 51 to the nearest tenU
Round 3,453 to the nearest thousandH
Round 4,305 to the nearest hundredK
Round 1,307 to the nearest hundredG
Round 294 to the nearest tenV
0/14 letters found
Clue 2
Addition
A crate of training gear was knocked over during the escape. If we add up the weight of all the spilled items, we can unlock the backup security feed.
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
8058
9226
3052
8805
7398
8805
6695
3052
3315
T
8058
8872
3052
9262
6983
8805
T
8058
9226
3052
9363
6983
8872
9262
T
8058
3315
9226
4918
8964
T
8058
9226
3052
3122
3052
5459
T
8058
2789 + 5269 =T
3017 + 4381 =U
1755 + 1560 =C
5354 + 3518 =W
2869 + 6095 =N
1855 + 1197 =E
2745 + 2173 =O
2833 + 4150 =R
6182 + 3181 =I
5998 + 3228 =H
3720 + 2975 =P
5655 + 3607 =A
3656 + 1803 =F
1793 + 1329 =L
3442 + 5363 =S
0/15 letters found
Clue 3
Subtraction
The vault's laser barriers lost power during the heist. By subtracting the remaining battery level from the maximum, we can calculate how long the rogue was inside.
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
7397
8547
5019
7064
2573
5019
7048
7048
8960
2562
7064
4194
3620
3620
2962
7064
S
7397
2562
2962
7064
2962
4506
2962
2259
2877
8890
2962
1198
8092
3636
4761
7514 - 117 =S
4567 - 1605 =E
8854 - 762 =I
5229 - 1035 =A
7158 - 4596 =W
7102 - 54 =M
3126 - 867 =F
11505 - 2958 =O
3956 - 1383 =G
4850 - 1973 =T
7876 - 3115 =D
12921 - 4031 =B
7153 - 2134 =U
4287 - 667 =P
11493 - 4429 =R
7084 - 2578 =L
11170 - 2210 =Y
8318 - 4682 =N
3505 - 2307 =H
0/19 letters found
Clue 4
Multiplication facts (1-12)
The hallway is lined with grids of gear lockers. Multiplying the rows of lockers by the columns will reveal which locker holds the next clue.
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
77
4
1
28
32
66
80
33
100
2
28
W
77
56
66
100
66
4
28
66
132
2
32
4
80
56
25
100
32
56
25
4
3
33
56
45
11 × 7 =W
1 × 1 =F
3 × 11 =A
11 × 12 =B
9 × 5 =R
1 × 4 =E
8 × 4 =U
10 × 10 =G
2 × 1 =L
7 × 4 =O
8 × 10 =D
8 × 7 =I
11 × 6 =N
3 × 1 =H
5 × 5 =S
0/15 letters found
Clue 5
Division facts (1-12) — the last clue
We intercepted a scrambled data packet of secret files. Dividing the total files equally among our team members will crack the decryption key.
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
9 ÷ 1 = ?
88 ÷ 8 = ?
44 ÷ 11 = ?
9 ÷ 9 = ?
32 ÷ 4 = ?
70 ÷ 10 = ?
80 ÷ 8 = ?
42 ÷ 7 = ?
14 ÷ 7 = ?
36 ÷ 12 = ?
60 ÷ 12 = ?
Step 2 — cross out the sentence with each answer
1.The villain vanished into thin air using a smoke bomb, then hacked into the main frame.
2.The villain snapped photos of the secret plans with a spy camera, then dodged the red security lasers.
3.The villain overrode the security keypad with a decoder watch, then broke the encrypted firewall code.
4.The villain overrode the security keypad with a decoder watch, then picked the heavy vault lock.
5.The villain snapped photos of the secret plans with a spy camera, then broke the encrypted firewall code.
6.The villain zapped the vault lock with a laser pen, then cracked the high-tech safe.
7.The villain zapped the vault lock with a laser pen, then hacked into the main frame.
8.The villain swung through the skylight with a grappling hook, then picked the heavy vault lock.
9.The villain vanished into thin air using a smoke bomb, then dodged the red security lasers.
10.The villain swung through the skylight with a grappling hook, then hacked into the main frame.
11.The villain overrode the security keypad with a decoder watch, then dodged the red security lasers.
12.The villain vanished into thin air using a smoke bomb, then broke the encrypted firewall code.
Solve it
Name the culprit
Choose the one suspect left standing.
Answer Key — The Golden Decoder Caper
Culprit: Agent Jax (Smoke Bomb · Code Breaking · Left Wrist Watch · Neon Blue Wig · Sour Gummies)
- Clue 1 (Rounding): "THE ROGUE AGENT DOES NOT HAVE HACKER ACCESS"Round 1,145 to the nearest hundred = 1100 (T) · Round 66 to the nearest ten = 70 (D) · Round 111 to the nearest ten = 110 (N) · Round 339 to the nearest hundred = 300 (S) · Round 694 to the nearest hundred = 700 (R) · Round 429 to the nearest ten = 430 (A) · Round 8,596 to the nearest thousand = 9000 (E) · Round 132 to the nearest ten = 130 (O) · Round 373 to the nearest ten = 370 (C) · Round 51 to the nearest ten = 50 (U) · Round 3,453 to the nearest thousand = 3000 (H) · Round 4,305 to the nearest hundred = 4300 (K) · Round 1,307 to the nearest hundred = 1300 (G) · Round 294 to the nearest ten = 290 (V)
- Clue 2 (Addition): "THE SUSPECT WEARS THEIR WATCH ON THE LEFT"2789 + 5269 = 8058 (T) · 3017 + 4381 = 7398 (U) · 1755 + 1560 = 3315 (C) · 5354 + 3518 = 8872 (W) · 2869 + 6095 = 8964 (N) · 1855 + 1197 = 3052 (E) · 2745 + 2173 = 4918 (O) · 2833 + 4150 = 6983 (R) · 6182 + 3181 = 9363 (I) · 5998 + 3228 = 9226 (H) · 3720 + 2975 = 6695 (P) · 5655 + 3607 = 9262 (A) · 3656 + 1803 = 5459 (F) · 1793 + 1329 = 3122 (L) · 3442 + 5363 = 8805 (S)
- Clue 3 (Subtraction): "SOUR GUMMY WRAPPERS WERE LEFT BEHIND"7514 - 117 = 7397 (S) · 4567 - 1605 = 2962 (E) · 8854 - 762 = 8092 (I) · 5229 - 1035 = 4194 (A) · 7158 - 4596 = 2562 (W) · 7102 - 54 = 7048 (M) · 3126 - 867 = 2259 (F) · 11505 - 2958 = 8547 (O) · 3956 - 1383 = 2573 (G) · 4850 - 1973 = 2877 (T) · 7876 - 3115 = 4761 (D) · 12921 - 4031 = 8890 (B) · 7153 - 2134 = 5019 (U) · 4287 - 667 = 3620 (P) · 11493 - 4429 = 7064 (R) · 7084 - 2578 = 4506 (L) · 11170 - 2210 = 8960 (Y) · 8318 - 4682 = 3636 (N) · 3505 - 2307 = 1198 (H)
- Clue 4 (Multiplication facts (1-12)): "WE FOUND A GLOWING NEON BLUE DISGUISE HAIR"11 × 7 = 77 (W) · 1 × 1 = 1 (F) · 3 × 11 = 33 (A) · 11 × 12 = 132 (B) · 9 × 5 = 45 (R) · 1 × 4 = 4 (E) · 8 × 4 = 32 (U) · 10 × 10 = 100 (G) · 2 × 1 = 2 (L) · 7 × 4 = 28 (O) · 8 × 10 = 80 (D) · 8 × 7 = 56 (I) · 11 × 6 = 66 (N) · 3 × 1 = 3 (H) · 5 × 5 = 25 (S)
- Clue 5 (Division facts (1-12)): surviving statement (box 12) → Agent Jax9 ÷ 1 = 9 · 88 ÷ 8 = 11 · 44 ÷ 11 = 4 · 9 ÷ 9 = 1 · 32 ÷ 4 = 8 · 70 ÷ 10 = 7 · 80 ÷ 8 = 10 · 42 ÷ 7 = 6 · 14 ÷ 7 = 2 · 36 ÷ 12 = 3 · 60 ÷ 12 = 5
About this mystery
- Grade level
- Grade 4 math
- Math topics
- Rounding, Addition, Subtraction, Multiplication, Division
- Reading level
- grades 5-6
- Theme
- The Golden Decoder Caper — set in Whispering Pines Spy Academy
- Format
- Interactive online & printable worksheet with answer key
- Solution
- One unique, verified culprit among 21 suspects